JP2009054386A - Time switch - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a time switch wherein a substrate is prevented from being corroded while improving assembling performance, and no stress is applied on the substrate so as to improve its appearance. <P>SOLUTION: This time switch is equipped with a case 1 composed of an almost rectangular box-shaped body 2 having an open front and an almost rectangular box-shaped cover 3 having an open back face, and a substrate block 4 housed in the case 1. With the substrate block 4 assembled in the body 2, engagement protrusions provided on both sides of the terminal block 9 are each engaged with engagement holes provided in the body 2 to fix the terminal block 6 to the body 2, and the substrate body 38a abuts on the top faces of a plurality of substrate receiving parts 2e provided in the body 2. If the body 2 is covered with the cover 3, the substrate 38a is held between the top face of the substrate receiving part 2e of the body 2 and the substrate pressing part 3m of the cover 3. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a time switch for controlling a load at a preset time.

  Conventionally, a time switch in which a weak electric circuit component and a high electric circuit component are mounted on one printed board has been provided (see, for example, Patent Documents 1 and 2). These time switches have low-power circuit components such as timing elements, display elements, and operation switches mounted on one side of a printed circuit board, and load control relays and power connection terminals on the other side. In addition, the time switch disclosed in Patent Document 2 has the printed circuit board incorporated into the body from the rear side with the front side of the body down. It is.

There has also been proposed a time switch in which a printed circuit board is fixed to a lower case with a screw (see, for example, Patent Document 3). This time switch is mounted with a clock function block equipped with a liquid crystal display and an operation switch on a printed circuit board, a relay for load control, a terminal block equipped with a power supply connection terminal and a load connection terminal, etc. Are screwed to the lower case at the four corners and stored in the case.
Japanese Utility Model Publication No. 3-51395 (page 7 and FIG. 2) JP-A-2-269994 (pages 9 to 10 and FIG. 28) Japanese Patent Laid-Open No. 11-134990 (paragraph [0005] and FIG. 15)

  In the time switch shown in Patent Document 3 described above, the printed circuit board is fixed to the lower case with screws, but since the terminal block is fixed only to the printed circuit board, each connection terminal of the terminal block is connected to a power line or a load. When the terminal screw tightening force when connecting the wires is large, a large stress is applied to the connection portion between the printed circuit board and the terminal block, and the printed circuit board may be bent. Furthermore, since the printed circuit board is screwed to the lower case, there is a problem that the assemblability is not good.

  Moreover, in the time switch shown in Patent Document 2, since the printed circuit board is assembled from the rear side with the front side of the body down, when the printed circuit board is assembled in the body, the surface of the body is caused by the pressing force applied at the time of assembly. There was a risk of injury.

  Furthermore, in these time switches, when the printed circuit board is installed in the case, the hand's grease adheres to the circuit portion by touching the circuit portion, and the portion where the grease adheres corrodes to cause a circuit short circuit or There was a risk of disconnection.

  The present invention has been made in view of the above problems, and its object is to prevent the corrosion of the substrate while improving the assemblability, and to improve the appearance without applying stress to the substrate. Is to provide a time switch.

  The invention of claim 1 is a terminal block comprising at least a low-power circuit component including a time-counting arithmetic element, a display element and an operation switch, and a power connection terminal to which a power source is connected and a load connection terminal to which a load is connected. And a board on which a high-power circuit component including a relay for load control for turning on / off the power supply to the load is mounted, and a case in which the board is housed in the upper case part and the lower case part The terminal block is fixed to the lower case portion by fitting the fitting portions provided on the terminal block and the lower case portion to each other, and the upper case portion is attached to either the upper case portion or the lower case portion. By engaging the provided engagement claw with the engagement hole provided on the other side, it is coupled to the lower case part so as to cover the fitting part, and the upper case part and the lower case part are clamped from both sides in the assembled state. Pinching means And wherein the digit.

  According to a second aspect of the present invention, the upper case portion has an opening that exposes the display element and the operation switch to the front side, and the lower case portion is a terminal that is provided along the board mounting direction and guides the terminal block. It is characterized by comprising a base guide part and a board guide part for guiding the board, a terminal base receiving part with which the terminal base abuts in the board mounting direction, and a board receiving part with which the base board contacts.

  According to the first aspect of the present invention, the terminal block can be fixed to the lower case portion only by fitting the fitting portions provided on the terminal block and the lower case portion, respectively. Compared to the case, the assembly can be improved, and the stress applied to the board by receiving the force applied to the terminal block at the upper case part and lower case part when connecting the electric power from the power supply or load to the terminal block. There is an effect that it becomes difficult to join. Furthermore, the board is not fixed with a fixing screw, but is held only by the clamping means of the upper case part and the lower case part, and even when a force from the terminal block is applied to the board, it is orthogonal to the clamping direction. Since the substrate can be moved in the direction, there is an effect that no stress is applied to the substrate and the substrate can be expanded and contracted in accordance with a change in ambient temperature. In addition, when the upper case portion is brought into contact with the fitting portion, the movement of the fitting portion can be restricted by the upper case portion, so that the terminal block can be firmly fixed. .

  According to the invention of claim 2, the substrate receiving portion, the terminal block receiving portion, the substrate guide portion and the terminal block guide portion are provided on the lower case portion side, and the force applied when the substrate is assembled on the lower case portion side is reduced. Since it is received on the case portion side, the surface of the upper case portion where the display element and the operation switch are exposed is not damaged, and there is an effect that it is possible to provide a time switch with improved appearance. Also, there is an effect that a time switch with good assemblability can be provided by assembling the substrate and the upper case part in this order with respect to the lower case part. Furthermore, when the board is assembled into the lower case part, it is only necessary to hold the end part of the board and place it on the board receiving part, so that the hand does not touch the circuit part, and therefore the hand grease adheres to the board and the circuit part. There is an effect that it is possible to prevent corrosion.

  An embodiment of the present invention will be described with reference to FIGS. The time switch of the present embodiment is used, for example, to turn on / off a connected load L (for example, lighting) at a preset time. In the following description, unless otherwise specified, the direction of the arrow ab in FIG. 3 is the front-rear direction, the direction of the arrow cd is the up-down direction, and the direction of the arrow ef is the left-right direction.

  As shown in FIGS. 2 and 3, the time switch includes a body (lower case part) 2 that opens on the front side, and a cover (upper part) that is attached to the body 2 so that the rear side opens and closes the opening of the body 2. A case portion 3, and a substrate block 4 housed in the case 1 formed by joining the body 2 and the cover 3.

  The substrate block 4 includes a substrate 38 on which a timer circuit 5 to be described later is formed, and a terminal block 6 having power connection terminals 36 and 36 and load connection terminals 37 and 37. FIG. 8 shows a block diagram of the timer circuit 5. The timer circuit 5 is composed of a microcomputer, and a clock unit 31 that measures the current day of the week and the current time based on a clock signal from the clock oscillation unit 30, and , A control unit 17 including a program storage unit 33 storing a program for controlling the load L at a desired time, a setting switch unit 13 including a plurality of push-type buttons, and mode switching including a slide switch Input via a switch 16, an operation setting switch 15 comprising a slide switch, a liquid crystal display unit 12 comprising a liquid crystal display, an LED display unit 14 (14a, 14b) comprising a plurality of LEDs, and power connection terminals 36, 36 A power supply unit 35 that generates an operating power supply from the commercial power supply AC and a power failure detection unit 28 that detects a power failure of the commercial power supply AC. An on / off command from the control unit 17 to supply power to the power failure compensation power source unit 39 that supplies power to the control unit 17 in the event of a power failure of the commercial power source AC and the load connection terminals 37 and 37 The output unit 19 that is turned on / off according to the above, a reset unit 29 that resets the operation of the control unit 17, and an oscillation unit 32 that generates a clock signal for operating the control unit 17 are provided. In the timer switch according to the present embodiment, a desired day of the week can be set as an operation condition. For example, a program for turning on the load L at 8:00 am every Monday can be set.

  As shown in FIG. 8, the power supply unit 35 includes a step-down circuit 35a for stepping down the commercial power supply AC input from the power supply connection terminals 36 and 36, and a direct current that converts the stepped-down input voltage to supply the operation power supply to the above-described units. It is comprised with the conversion circuit 35b, and the electricity supply state display part 14b lights up at the time of electricity supply of a power supply. Further, when a power failure of the commercial power supply AC is detected by the power failure detection unit 28, the power supply is switched from the power failure compensation power supply unit 39.

  Further, as shown in FIG. 8, the output unit 19 includes a drive circuit 19b that generates a drive signal in accordance with an on / off command from the control unit 17, and a relay 19a whose contact is turned on / off by this drive signal. The load L is connected to the power source via the contact of the relay 19a, and the power supply is switched on / off according to the on / off of the relay 19a. That is, the operation state in which the relay 19a is turned on and power is supplied to the load L and the stop state in which the relay 19a is turned off and power is not supplied to the load L are controlled by the control unit 17. . Further, when the load L is controlled to the operating state, the output state display unit 14a is lit.

  Further, as shown in FIGS. 5 and 8, one power connection terminal 36 and one output terminal 19c of the relay 19a are electrically connected by a conductive member 20 formed in a strip shape, and one load is connected. The connection terminal 37 and the other output terminal 19c of the relay 19a are electrically connected by a conductive member 21 formed in a strip shape.

  As shown in FIGS. 2 to 4, the terminal block 6 has a horizontally long terminal block 9 made of, for example, a synthetic resin, and a time switch case 1 is attached to a mounted portion at the center in the longitudinal direction of the terminal block 9. A screw insertion recess 9b through which a fixing screw 25 for attachment is inserted is provided, and a screw hole 9d is formed in the upper part of the screw insertion recess 9b. Further, the front and lower surfaces are opened on both sides in the longitudinal direction with the screw insertion recess 9b in between, and the terminal fitting 10 and the terminal screw 11 constituting the power connection terminals 36 and 36 and the load connection terminals 37 and 37 are accommodated. Two storage portions 9c are provided, and between the adjacent terminal storage portions 9c, 9c, insulating walls 9a for ensuring insulation between the terminals are provided. Furthermore, guide grooves 9e through which terminal block guide pieces 2k projecting from the body 2 are inserted are provided on both side walls along the width direction of the terminal block 9, and the terminal block guide pieces 2k are inserted into the guide grooves 9e. A fitting projection (fitting portion) 9f that fits with the fitting hole (fitting portion) 2p that penetrates is provided outwardly. In the present embodiment, the two terminals arranged on the left side in FIG. 3 constitute the power connection terminals 36 and 36, and the two terminals arranged on the right side constitute the load connection terminals 37 and 37. .

  The board 38 constituting the board block 4 is a printed board, and has a substantially rectangular plate-like board body 38a as shown in FIGS. 2, 4 and 5, and a terminal block block is provided at one end of the board body 38a. A terminal block mounting portion (not shown) for mounting the terminal block 9 when the 6 is mounted on the substrate body 38a is integrally formed. The terminal block mounting portion is separated from the substrate body 38a after the terminal block block 6 is mounted on the substrate body 38a.

  As shown in FIG. 2, a liquid crystal display unit 12 is disposed on the front left side of the substrate main body 38a as shown in FIG. 2, and this liquid crystal display unit 12 has a current time state (for example, current day of the week, current time, time counting operation). Dot, etc.) and timer setting status (for example, “ON” and “OFF” indicating the timer setting time and load operating status) are displayed. In addition, a setting switch unit 13 composed of a plurality of push-type buttons 13a is disposed on the front surface of the substrate body 38a below the liquid crystal display unit 12, and a desired day of the week or A program for turning on / off the load L at the time is set. Each push-type button 13a uses a so-called conductive rubber switch that is turned on / off by conducting the pressed conductive rubber to a conductive pattern 42 (see FIG. 5) formed on the substrate body 38a.

  Further, on the front side of the substrate body 38a, on the right side of the liquid crystal display unit 12 and the setting switch unit 13, an output state display unit 14a composed of LEDs for displaying the output state of the load L, automatic operation according to slide operation, continuous input Operation setting switch 15 for setting any one of operation, continuous turn-off operation, manual temporary turn-on operation or manual temporary turn-off operation, energization state display unit 14b including an LED for indicating the energization state of the power source, and displaying the current time A mode changeover switch 16 that is switched to any one of a clock display mode, a timer setting mode for setting a timer, and a clock setting mode for setting the current time is arranged side by side in the vertical direction.

  Here, the automatic operation compares the current time measured by the clock unit 31 with the time (set time) set by the program based on the program stored in the program storage unit 33 by the control unit 17. The load control operation that operates or stops the load when the current time coincides with the set time. The continuous input operation indicates that the control unit 17 continuously changes the operation state of the load regardless of the operation / stop control based on the program. The continuous cut operation refers to a load control operation in which the control unit 17 continuously maintains the load stop state regardless of the operation / stop control based on the program. The manual temporary turning-on operation refers to a load control operation in which the control unit 17 temporarily turns a stopped load into an operating state regardless of the operation / stop control based on the program. It refers to a load control operation in which the control unit 17 temporarily sets a load in an operation state to a stop state regardless of the operation / stop control based on the program. The manual temporary entry operation is performed after the operation unit of the operation setting switch 15 is switched from the automatic operation position (middle position in FIG. 3) to the continuous entry operation position (upper position in FIG. 3). It is set by returning to the automatic operation position again within the time, and the manual temporary cut operation is performed by moving the operation unit of the operation setting switch 15 from the automatic operation position to the continuous cut operation position (the lower position in FIG. 3). After switching, it is set by returning to the automatic operation position again within a predetermined time.

  As shown in FIGS. 1 and 5, a relay 19a constituting the output unit 19 is arranged on the rear surface of the board body 38a, and a terminal block 6 is arranged below the relay 19a. Further, the output terminal 19c on one side (left side in FIG. 5) of the relay 19a and the one power connection terminal 36 of the terminal block 6 are electrically connected via the conductive member 20 disposed on the rear surface. The other output terminal 19c (the right side in FIG. 5) of the relay 19a and one load connection terminal 37 of the terminal block 6 are electrically connected via a conductive member 21 arranged on the rear surface. Yes. That is, the substrate body 38a of the present embodiment has a display element constituting the liquid crystal display unit 12 and the LED display unit 14 on the front surface, an arithmetic element 23 constituting the control unit 17, and each operation switch (setting switch unit 13, operation Light electrical circuit components such as a setting switch 15 and a mode change switch 16) are disposed, and high electrical circuit components such as a relay 19a, a terminal block 6 and conductive members 20 and 21 are disposed on the rear surface.

  As shown in FIGS. 1 and 5, the conductive member 20 has a substantially L-shaped main piece 20 a, and the end portions 10 a of the terminal fittings 10 constituting the power connection terminals 36 are inserted into both ends of the main piece 20 a. A connecting portion 20b through which an insertion hole (not shown) is inserted, and a connection portion 20c through which an insertion hole (not shown) through which the output terminal 19c of the relay 19a is inserted are integrally provided. It has been. Further, a step is formed between the connecting portions 20b and 20c and the main piece 20a in the front-rear direction (thickness direction of the substrate body 38a) by bending the connecting portion of the main piece 20a with the connecting portions 20b and 20c obliquely downward. Is provided. Further, a pair of fixing claws 20f and 20f that are respectively inserted into fixing holes (not shown) that protrude to the front surface side (substrate body 38a side) and penetrate the substrate body 38a are provided on the main piece 20a on the connection portion 20c side. Are provided integrally.

  Further, as shown in FIG. 5, the conductive member 21 has a substantially I-shaped main piece 21a, and the distal end portion 10a of the terminal fitting 10 constituting the load connection terminal 37 is inserted into both ends of the main piece 21a. A connecting portion 21b through which an insertion hole (not shown) is inserted and a connection portion 21c through which an insertion hole (not shown) through which the output terminal 19c of the relay 19a is inserted are integrally provided. ing. Further, a step is formed between the connecting portions 21b and 21c and the main piece 21a in the front-rear direction (thickness direction of the substrate body 38a) by bending the connecting portion of the main piece 21a with the connecting portions 21b and 21c obliquely downward. Is provided. Further, a fixing claw 21f that protrudes to the front side (substrate body 38a side) and is inserted into a fixing hole (not shown) penetrating the substrate body 38a is integrally provided at a portion of the main piece 21a on the connection portion 21c side. ing.

  On the other hand, in the substrate main body 38a, notches 38d are provided in portions corresponding to the connecting portions 20b of the conductive member 20 and the connecting portions 21b of the conductive member 21, respectively, and in portions corresponding to the connecting portions 20c and 21c. A substantially rectangular opening 38c is provided in each case.

  Thus, when the conductive member 20 is attached to the board body 38a, the connecting portion 20b is fitted into the notch portion 38d, the connecting portion 20c is fitted into the opening portion 38c, and each fixing claw 20f is inserted into the corresponding fixing hole. When inserted and fitted, the conductive member 20 is attached to the substrate body 38a. At this time, the connecting portions 20b and 20c are arranged so that the surfaces thereof are substantially the same height as the rear surface of the substrate body 38a. The conductive member 21 is also attached to the substrate main body 38a in the same manner as the conductive member 20, and the description thereof is omitted.

  The body 2 is a synthetic resin molded product having a substantially rectangular box shape with a small thickness, for example, and a time switch case 1 is provided at the center in the width direction on the bottom surface on one end side in the longitudinal direction of the body 2 (upper side in FIG. 4). A screw insertion hole 2c through which a fixing screw 25 for attaching the terminal 2 to the attachment portion is inserted, and the terminal block 6 is provided on the bottom of the other end in the longitudinal direction of the body 2 (the lower side in FIG. 4). A pair of terminal block guide walls 2g and 2g for guiding are juxtaposed in the left-right direction. Thus, in the longitudinal direction of the body 2, a substrate storage portion 2h for storing the substrate body 38a is formed on the upper side of the terminal block guide walls 2g and 2g. On the lower side, terminal block storage portions 2b and 2b for storing the terminal block 6 are formed.

  Further, a plurality of substrate receiving portions 2e having contact surfaces with which the lower surface of the substrate body 38a abuts on both side walls along the longitudinal direction and side walls along the width direction on the substrate storage portion 2h side of the body 2 toward the front side. (In the present embodiment, four) are provided so as to be integrally provided with a substrate guide portion 2m for guiding the substrate body 38a at the tip of each substrate receiving portion 2e on the side wall side along the width direction. . The inner side surface of each substrate guide portion 2m is an inclined surface inclined obliquely downward, and the substrate body 38a is assembled while the end edge is brought into contact with the inclined surface when incorporated in the body 2. At this time, it is only necessary to hold the end portion of the substrate main body 38a and place it on the contact surface of the substrate receiving portion 2e, so that the circuit portion is not touched by the hand, and therefore the hand grease adheres to the substrate main body 38a. It is possible to prevent the portion from corroding.

  Furthermore, two engaging claws 2d projecting outward are provided on each side wall along the longitudinal direction of the body 2 at predetermined intervals along the longitudinal direction. On the end side (lower side in FIG. 4), a screw insertion recess 2a communicating with a screw insertion recess 9b provided in the terminal block 9 is provided between the terminal block storage portions 2b and 2b. Further, terminal block guide pieces 2k inserted into guide grooves 9e respectively provided on both side walls of the terminal block 9 are provided on both side walls along the longitudinal direction on the terminal block storage portion 2b side of the body 2 toward the front side. Each terminal block guide piece 2k is provided with a fitting hole 2p through which the fitting projection 9f of the terminal block 9 is fitted. In addition, in each side wall along a longitudinal direction, the terminal block guide piece 2k is provided so that it may be located inside the engaging claw 2d provided in the same side. In addition, two substantially cylindrical terminal block receiving portions 2n with which the lower surface of the terminal block 9 abuts in the assembled state are provided on the bottom surface of each terminal block storage portion 2b. The terminal block guide walls 2g and 2g and the terminal block guide pieces 2k and 2k constitute a terminal block guide portion.

  Further, as shown in FIG. 1, an attachment groove 2j for attaching the case 1 of the time switch to a DIN rail (not shown) is provided in the width direction (front-rear direction in FIG. 1). Further, a rail attachment 8 is attached to one end of the back surface of the body 2 in the longitudinal direction (left side in FIG. 1). In addition, a locking projection 2l that protrudes inward is integrally provided at the end of the mounting groove 2j opposite to the rail mounting tool 8.

  The rail fixture 8 is, for example, a synthetic resin molded product, and has a vertically long substantially I-shaped main piece 8d as shown in FIGS. 1 and 2, and intersects with the main piece 8d at the front end side of the main piece 8d. A spring body 8c extending in the direction to be integrated is integrally provided. The rail attachment 8 is attached to the body 2 by inserting the main piece 8d through a groove (not shown) provided on the bottom surface of the body 2, and the main piece 8d extends along the groove along the attachment groove 2j. The holding position for holding the DIN rail by sandwiching one locking piece of the DIN rail between the insertion groove 2j and the bottom surface of the mounting groove 2j, and retreating from the mounting groove 2j to release the holding of the DIN rail It can be moved forward and backward between the release position.

  Thus, when the case 1 is attached to the DIN rail, the engaging piece on the one end side in the width direction of the DIN rail is inserted between the bottom surface of the attaching groove 2j and the engaging protrusion 2l. When the DIN rail is pushed into the mounting groove 2j while the locking piece is in contact with the tip 8b of the main piece 8d, the main piece 8d is moved outward (left side in FIG. 1) by the pressing force from the DIN rail. When the spring body 8c is urged outward and the DIN rail is further pushed in and the other end side locking piece is disposed between the bottom surface of the mounting groove 2j and the tip 8b of the main piece 8d, the spring body 8c 1 (the rightward force in FIG. 1) causes the main piece 8d to move inward (right side in FIG. 1), and the locking piece on the other end of the DIN rail is the bottom surface of the mounting groove 2j and the main piece 8d. And the case 1 is attached to the DIN rail.

  On the contrary, when removing the case 1 from the DIN rail, if the rail fixture 8 is moved backward (moved to the left in FIG. 1) from the inside of the mounting groove 2j against the reaction force from the spring body 8c, The clamping state of the end side locking piece is released, and the case 1 is removed from the DIN rail.

  Further, as shown in FIG. 2, a screw insertion hole 8a through which the fixing screw 25 is inserted is provided in the main piece 8d of the rail fixture 8 on the lower end side (the side opposite to the tip portion 8b). It is also possible to fix the screw to the attachment portion by using the fixing screws 25 and 25 respectively inserted into the insertion hole 8a and the screw insertion hole 2c of the body 2 described above. Here, as shown in FIG. 3, the rail attachment 8 has a screw insertion recess 9 b, a screw insertion recess 2 a, and a portion where the screw insertion hole 8 a is provided so as not to protrude outward from the lower side surface of the case 1. It arrange | positions in the screw insertion recessed part comprised by the screw insertion recessed part 3c.

  The cover 3 is a substantially rectangular box-shaped synthetic resin molded product whose vertical and horizontal dimensions are approximately the same as those of the body 2, and is attached to the body 2 to form the case 1 together with the body 2. To do. A screw insertion hole 3a communicating with the screw insertion hole 2c of the body 2 is provided on one end side in the longitudinal direction of the cover 3 (upper side in FIG. 2), and an operation portion is provided on the front surface of the cover 3 below the screw insertion hole 3a. A substantially rectangular mounting recess 3l to which the partial display sheet 7 is fixed is provided. In addition, a substantially rectangular opening window (opening) 3d that allows the display content of the liquid crystal display unit 12 to be visually recognized from the front is provided at a portion corresponding to the liquid crystal display unit 12 on the bottom surface of the mounting recess 3l. Under the opening window 3d, an exposed portion (opening portion) 3e including a plurality of holes for exposing the operation portion of each push-type button 13a constituting the setting switch portion 13 to the front side is provided. Further, on the right side of the opening window 3d and the exposed portion 3e, an exposure window (opening portion) 3f for exposing light from the LED to the front side at a portion corresponding to the output state display portion 14a and the energization state display portion 14b, 3h are respectively provided, and grooves 3g and 3j are provided at positions corresponding to the operation setting switch 15 and the mode change switch 16 to dispose the knobs 18 attached to the operation portions of the respective switches. An exposure hole (opening) that exposes the operation portion of each switch to the front side is formed through the bottom. These exposure windows 3f and 3h and grooves 3g and 3j are provided side by side in the vertical direction in the mounting recess 3l. The knob 18 is attached in order to improve the operability of each switch, and is arranged in the grooves 3g and 3j so as to be movable in the vertical direction.

  Further, a notch 3b for exposing the terminal block 6 is provided on the other end side in the longitudinal direction of the cover 3 (lower side in FIG. 2), and the name of each terminal (book) is provided above the notch 3b. In the embodiment, a name plate 27 on which a power source and a load are described is attached. Further, at the other end in the longitudinal direction of the cover 3, a screw insertion recess 9 b provided in the terminal block 9 and a screw insertion provided in the body 2 are formed by bending the side wall into a substantially U shape at the center in the width direction. A screw insertion recess 3c communicating with the recess 2a is provided. Further, on both side walls along the longitudinal direction of the cover 3, engagement holes 3 k that engage with the engagement claws 2 d are provided at portions corresponding to the engagement claws 2 d provided on the body 2. The cover 3 is attached from the side, and the case 1 is assembled by engaging each engagement claw 2d with the corresponding engagement hole 3k.

  In addition, substrate pressing portions 3m are respectively provided on the inner surface of the cover 3 at portions corresponding to the substrate receiving portions 2e of the body 2, and when the case 1 is assembled, as shown in FIG. 38a is sandwiched between the contact surface (upper surface) of the substrate receiving portion 2e and the lower surface of the substrate pressing portion 3m. Here, the substrate receiving portion 2e of the body 2 and the substrate pressing portion 3m of the cover 3 constitute a clamping means.

  The operation unit display sheet 7 is formed in a substantially rectangular sheet shape by, for example, acrylic resin, and display contents and light from the LEDs are received at portions corresponding to the liquid crystal display unit 12, the output state display unit 14a, and the energization state display unit 14b. Transparent portions 7a and 7b are provided so as to be visible from the front side. Further, exposure holes 7c and 7d for exposing the operation parts of the respective switches are provided in portions corresponding to the setting switch part 13, the operation setting switch 15 and the mode change switch 16, and further, the transparent part 7b and the exposure hole are provided. In the vicinity of 7c and 7d, a character string 26 indicating the mode of each switch, LED display target, and the like is formed by printing, for example. The operation portion display sheet 7 is fixed to the cover 3 in a state where the operation portion display sheet 7 is disposed in the mounting recess 3l, and the knob 18 is provided between the operation portion display sheet 7 and the cover 3 in a state where the groove 3g, 3j.

  A front cover 22 is attached to the front side of the cover 3 as shown in FIG. The front cover 22 has a substantially rectangular box shape with an open bottom surface, and is formed of, for example, a transparent acrylic resin. Even when the front cover 22 is attached to the cover 3, the display contents of the liquid crystal display unit 12 and each switch You can check the setting status.

  Here, the assembly procedure of the time switch will be described with reference to FIGS. First, the rail fixture 8 is attached to the bottom surface of the body 2, and the board block 4 is mounted from the front side so that the board body 38a is on the board housing part 2h side and the terminal block 6 is on the terminal board housing parts 2b and 2b side. 2 in. At this time, in the terminal block 9, the terminal block guide pieces 2k and 2k of the body 2 are inserted into the guide grooves 9e and 9e, respectively, and the upper side surface of the terminal block 9 contacts the both terminal block guide walls 2g and 2g. Guided by contact, the fitting protrusions 9f in each guide groove 9e are fixed to the body 2 by fitting into the fitting holes 2p of the corresponding terminal block guide pieces 2k. In this state, the terminal block 9 is arranged with the lower surface in contact with the upper surface of the terminal block receiving portion 2n. The substrate body 38a is accommodated in the substrate accommodating portion 2h while being in contact with the inclined surface of the substrate guide portion 2m, and is placed in a state where the lower surface is in contact with each abutting surface of the four substrate receiving portions 2e. .

  Next, the setting switch section 13 is attached to the board body 38a so that each push button 13a corresponds to each conductive pattern 42 provided on the board body 38a (see FIG. 5). Further, the case 3 is assembled by attaching the cover 3 to the body 2 from the front side and engaging the engaging claws 2d of the body 2 with the engaging holes 3k of the corresponding cover 3 (see FIG. 7).

  At this time, the liquid crystal display unit 12 is arranged in a state facing the opening window 3d, and each push-type button 13a of the setting switch unit 13 is arranged in a state where the operation unit is exposed from the corresponding hole of the exposure unit 3e. The The output state display unit 14a and the energization state display unit 14b are arranged with the exposure windows 3f and 3h facing, respectively, and the operation setting switch 15 and the mode switch 16 communicate the operation unit with the grooves 3g and 3j. The terminal block 6 is arranged in a state of facing the notch 3 b of the cover 3. Further, the substrate body 38 a is sandwiched between the lower surface of the substrate pressing portion 3 m of the cover 3 and the contact surface (upper surface) of the substrate receiving portion 2 e of the body 2. In this state, each terminal block guide piece 2k of the body 2 is in contact with each side wall along the longitudinal direction of the cover 3, as shown in FIG. Therefore, the terminal block 6 can be firmly fixed to the case 1.

  Finally, the knobs 18 and 18 are respectively attached to the operation portions of the operation setting switch 15 and the mode change switch 16 and are disposed in the grooves 3g and 3j. Further, the operation portion display sheet 7 is attached to the mounting recess 3l of the cover 3 from the front side. After being fixed inside, when a terminal cover (not shown) is attached to the cover 3 so as to cover the terminal block 6, the assembly of the time switch is completed.

  Further, the assembled time switch is attached to the DIN rail or attached to the attached portion using the fixing screw 25, and the power line and the electric wire from the load L (both not shown) pass through the notch 3b of the cover 3. The power supply connection terminals 36 and 36 and the load connection terminals 37 and 37 of the terminal block 6 are respectively connected. Then, when the terminal cover is screwed to the terminal block 9 using a fixing screw (not shown) and the front cover 22 is attached to the cover 3, the time switch installation is completed.

  Next, the control operation of the load L by the time switch will be described based on FIG. When the control unit 17 starts the operation (step S1), after the clock unit 31 performs the current time measuring operation (step S2), the control unit 17 automatically performs the operation set by the slide operation of the operation setting switch 15. It is determined whether or not it is an operation (step S3). If it is determined in step S3 that the operation is automatic, the control unit 17 compares the day of the week and time set by the program stored in the program storage unit 33 with the current day of the week and time (step S4), When the day of the week and time coincide with the set day of the week and time, the control unit 17 outputs an on / off command to the output unit 19, and the output unit 19 turns on / off the load L based on the on / off command. (Step S5).

  If it is determined in step S3 that the operation is not an automatic operation, the control unit 17 determines whether the operation set by the slide operation of the operation setting switch 15 is a continuous on operation or a continuous cut operation (step S6). ). When it is determined in step S6 that the operation is the continuous input operation or the continuous cut operation, the control unit 17 continuously outputs an on / off command to the output unit 19 regardless of the program. Based on this, the output unit 19 continuously turns on / off the load L (step S7).

  Further, when it is determined in step S6 that neither the continuous input operation nor the continuous cut operation is performed, the control unit 17 determines that the operation set by the slide operation of the operation setting switch 15 is a manual temporary input operation or a manual temporary cut operation. It is determined whether or not there is (step S8). If it is determined in step S8 that the operation is a manual temporary turning-on operation or a manual temporary turning-off operation, the control unit 17 temporarily outputs an on / off command to the output unit 19 regardless of the program, and this on / off operation is performed. Based on the command, the output unit 19 temporarily turns on / off the load L (step S9).

  Then, when the control operation of the load L is completed, the operation returns to the time measuring operation (step S2), and thereafter, the operation control of the load L is performed by repeating the above steps S2 to S9.

  In the time switch of the present embodiment, the terminal block 6 can be fixed to the body 2 simply by fitting the fitting protrusion 9f provided on the terminal block 9 into the fitting hole 2p provided on the body 2. Compared with the case of fixing with screws, the assemblability can be improved, and the force applied to the terminal block 9 when the electric power from the power source or the load is connected to the terminal block block 6 by the cover 3 and the body 2. By receiving, it becomes difficult to apply stress to the substrate body 38a.

  Further, the board body 38a is not fixed with a fixing screw and is held only by the clamping means constituted by the board receiving part 2e of the body 2 and the board pressing part 3m of the cover 3. Even when the force is applied to the substrate body 38a, the substrate body 38a can be moved by the play between the both clamping means, so that no stress is applied to the substrate body 38a and the substrate body can be adjusted according to changes in the ambient temperature. 38a can be expanded and contracted. Further, a substrate receiving portion 2e, a terminal block receiving portion 2n, a substrate guide portion 2m, and a terminal block guide portion (a terminal block guide wall 2g and a terminal block guide piece 2k) are provided on the body 2 side. Since the body 2 side receives the force applied at the time of incorporation by incorporating it on the side, the display element (liquid crystal display unit 12 and LED display unit 14) and operation switches (setting switch unit 13, operation setting switch 15 and mode switching switch) The surface of the cover 3 where 16) is exposed is not damaged, and an attractive time switch can be provided. Furthermore, a time switch with good assemblability can be provided by assembling the substrate block 4, the setting switch section 13, and the cover 3 in this order with respect to the body 2 as described above.

  In this embodiment, the case where the cover 3 is provided with the engagement hole 3k and the body 2 is provided with the engagement claw 2d has been described as an example, but the cover 3 is provided with the engagement claw and the body 2 is provided with the engagement hole. Alternatively, the body 2 and the cover 3 can be easily combined, and a time switch with good assemblability can be provided.

It is a longitudinal cross-sectional view of the time switch of this embodiment. It is an exploded perspective view same as the above. It is a perspective view same as the above. It is a perspective view which shows the assembly procedure same as the above. It is another perspective view which shows the assembly procedure same as the above. It is a cross-sectional view which shows the fitting state of a terminal block block and a body same as the above. It is a cross-sectional view which shows the fitting state of a cover and a body same as the above. It is a block diagram of the timer circuit formed in the board | substrate used for the same as the above. It is a flowchart figure which shows the control operation of load same as the above.

Explanation of symbols

1 Case 2 Body (lower case)
2d engaging claw 2e board receiving part 2p fitting hole (fitting part)
3 Cover (upper case)
3k engagement hole 3m board holding part 9 terminal block 9f fitting protrusion (fitting part)
DESCRIPTION OF SYMBOLS 12 Liquid crystal display part 13 Setting switch part 14 LED display part 15 Operation | movement setting switch 16 Mode changeover switch 19a Relay 23 Operation element 36 Power supply connection terminal 37 Load connection terminal 38a Substrate body

Claims (2)

  Power supply to a load and a terminal block including at least a low-power circuit component including a timing calculation element, a display element and an operation switch, and a power connection terminal to which a power source is connected and a load connection terminal to which a load is connected The terminal block includes a single board on which a high-power circuit component including a load control relay to be turned on / off is mounted, and a case that is composed of an upper case part and a lower case part and accommodates the board therein. The upper case portion is fixed to the lower case portion by fitting the fitting portions provided on the base and the lower case portion to each other, and the upper case portion is provided with an engaging claw provided on either the upper case portion or the lower case portion. The lower case portion is coupled so as to cover the fitting portion by engaging with the engaging hole provided in the upper case portion, and the upper case portion and the lower case portion are provided with holding means for holding the substrate from both sides in the assembled state. thing Time switch which is characterized.   The upper case portion has an opening that exposes the display element and the operation switch to the front side, and the lower case portion is provided along a board mounting direction, respectively, and a terminal block guide portion that guides the terminal block and 2. The time switch according to claim 1, further comprising: a substrate guide portion for guiding the substrate; a terminal block receiving portion with which the terminal block abuts in the board mounting direction; and a substrate receiving portion with which the substrate abuts.

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