JP2005111157A - Control box of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve productivity and reduce production cost supporting a plurality of sewing machines. <P>SOLUTION: The control box has a casing 20 having an opening 21 on the front, an operating panel 30 removably attached to the casing 20 as if to cover the opening 21. An indication 33 corresponding to the type of a sewing machine to be controlled is made on the surface side 32 of the operating panel 30, and an intrinsic circuit board 50 having a circuit responding to the type of a sewing machine to be controlled is supported on the reverse side of the operating panel 30 and a common circuit board 40 having a circuit portion commonly used irrespective of the type of a sewing machine is supported on the casing 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a control box for a sewing machine incorporating a control circuit board.

In general, a control box of a sewing machine includes an outer casing and an internal circuit board, and an operation panel is provided on a front portion thereof. In addition, since it is sufficient to perform the function of storing the circuit board for the outer casing, it is not necessary to provide a plurality of different types of sewing machines with different structures, and the configuration is shared among different types of sewing machines as much as possible. It was hoped that.
From this point of view, conventionally, when a circuit board and an operation panel are provided on a chassis that can be separated from the casing, and the control box is used for a different type of sewing machine, by replacing the entire chassis, at least only the casing can be replaced. A control box that can use a conventional one has been developed (see, for example, Patent Document 1).
JP 59-55287 A (FIG. 4)

However, the above-mentioned prior art only leaves the outer casing by replacement, and even if only a part of the configuration on the circuit board is changed, all the configurations on the circuit board are exchanged, so that different models are used. There has been a problem that the cost for dealing with the problem cannot be sufficiently reduced and the productivity is low because many overlapping parts need to be produced.
An object of the present invention is to provide a control box that is advantageous in terms of productivity and production cost when dealing with a plurality of sewing machines.

  The invention according to claim 1 includes a housing having an opening on the front surface and an operation panel detachably attached to the housing so as to cover the opening, and the operation surface of the operation panel is controlled A display corresponding to the model of the target sewing machine is displayed, and a specific circuit board having a circuit unit corresponding to the model of the sewing machine to be controlled is supported on the back of the operation panel. The configuration is such that a common circuit board having a circuit portion that is used in common is supported regardless of the model.

In the above configuration, the “front surface of the housing” refers to a surface facing the user of the sewing machine when the control box is installed on the sewing machine and the sewing machine is used.
In the above configuration, when a common circuit unit is mounted on the specific circuit board, not limited to the type of sewing machine, it is desirable that the mounting amount be small. That is, it is desirable to mount the common circuit portion on the common circuit board as much as possible.

  With this configuration, when a control box corresponding to a certain type of sewing machine is transferred to a different sewing machine, only the operation panel and the specific circuit board supported by the control box are removed, and an operation corresponding to the new type of sewing machine is displayed. It is replaced with a specific circuit board corresponding to the panel and a new sewing machine. Accordingly, since the circuit unit that is used in common regardless of the type of the sewing machine is used without being exchanged, the configuration necessary for dealing with the new sewing machine can be minimized.

  The invention described in claim 2 has the same configuration as that of the invention described in claim 1, and the common circuit board is disposed on the ceiling side of the inside of the housing, that is, the surface opposite to the component surface, that is, the solder surface. The operation panel is an opening of the housing, and is supported so as to be openable and closable by a rotation operation with respect to the opening at the edge of the bottom of the housing. The composition is taken.

The “ceiling surface” refers to a surface that is an upper surface when the control box is used or attached to the sewing machine. In addition, the “bottom surface” refers to a surface that is a lower surface when the control box is used or attached to the sewing machine.
In addition, the “component surface of the substrate” refers to a surface on which more components are attached among one surface and the other surface of the substrate.

The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the common circuit board has a surface on the opposite side of the component surface inside the housing, on the inner surface of the ceiling surface of the housing. It is supported in the state of facing each other.
On the other hand, the operation panel is supported so as to be rotatable at an edge portion around the opening of the housing and on the bottom surface side. Therefore, the operation panel covers the opening in a state where one end of the operation panel is supported on the bottom surface side of the casing, and rotates to open the opening in a state where the operation panel is entirely separated from the ceiling surface. Accordingly, the operation panel is arranged away from the common circuit board, and the operation panel does not hinder the observation of the component surface of the common circuit board inside the housing.

  The invention described in claim 3 has the same configuration as that of the invention described in claim 2, and on the solder surface of the common circuit board, the first heat generating component has a surface opposite to the heat dissipating surface as a solder surface. It is equipped in a state of being opposed to each other and is mounted so that the heat radiating surface is in contact with the ceiling surface.

In the above configuration, when one surface of the substrate is a “component surface”, the connecting leg of each component is passed through the opposite surface of the substrate and connected by soldering or the like on the opposite surface. It is common. Therefore, the surface opposite to the “component surface” is defined as a “solder surface”. However, the term “solder surface” is merely a term that defines the opposite side of the component surface. For example, even if some minor components are mounted on the opposite surface of the component surface, The surface opposite to the surface is the solder surface.
In such a configuration, unlike the other components, the first heat generating component is provided on the solder surface side of the common circuit board. Thereby, since the first heat generating component is arranged close to the ceiling surface of the housing, the surface facing the ceiling surface of the first heat generating component is arranged to contact the ceiling surface as a heat radiating surface. It is structured to release heat from the housing to the housing.

The invention described in claim 4 has the same configuration as that of the invention described in claim 2, and further includes a plate-like heat radiating plate in contact with the second heat generating component mounted on the component surface of the common circuit board. Is configured to be screwed to a boss portion extending downward from the ceiling surface inside the housing.
In such a configuration, the second heat generating component transmits heat to the housing via the heat radiating plate and the boss portion, and heat is radiated.

  According to the first aspect of the present invention, a circuit unit corresponding to various kinds of sewing machines is mounted on a common circuit board supported by the casing, and various sewing machines are provided on a specific circuit board supported by an operation panel whose display is different for each type of sewing machine. Since it has a unique circuit section, it is only necessary to replace the minimum configuration when dealing with other types of sewing machines, reducing the number of required control box configurations for multiple sewing machines. Therefore, it is possible to improve productivity and reduce production costs.

  In the invention according to claim 2, the common circuit board is disposed close to the ceiling surface inside the housing, and the operation panel is rotatably supported by the edge portion on the bottom surface side of the opening of the housing. Therefore, by rotating to the open state, the operation panel is placed away from the ceiling surface side of the housing and the common circuit board, and the operation panel is obstructed when observing the component surface of the common circuit board inside the housing. In addition, internal inspection and maintenance can be facilitated.

In the third aspect of the present invention, the first heat-generating component is provided on the solder surface side of the common circuit board, and the heat dissipation surface is disposed in contact with the ceiling surface of the housing, so that heat is released from the heat dissipation surface to the housing side. It becomes possible. For this reason, according to the heat conductivity of the raw material of a housing | casing, the heat which arises from a 1st heat-emitting component can be released, and it becomes possible to thermally radiate effectively. In particular, since the casing itself is in direct contact with the outside air, it is easy to be cooled, and the structure that allows heat to escape can effectively radiate heat.
In addition, as parts used in the circuit part that is commonly used regardless of the machine model, parts that generate a large amount of heat (such as power circuits, drive circuits such as sewing motors and solenoids) inevitably flow. Since the number of first heat generating components increases, mounting these components on the common circuit board and attaching them to the ceiling surface of the control box with a large heat release improves the heat dissipation effect of the control box of the sewing machine. You can also.

  In the invention according to claim 4, since the heat radiating plate is in contact with the second heat generating component and the heat radiating plate is supported by the boss portion produced from the case, the heat radiating plate and the boss are provided in the case that is easily cooled by the outside air. Heat can be released to the housing side through the section. For this reason, according to the heat conductivity of the raw material of a housing | casing, the heat which arises from a 2nd heat-emitting component can be released, and it becomes possible to thermally radiate effectively.

(Overall configuration of the embodiment of the invention)
FIG. 1 is a perspective view showing the overall configuration of a control box 10 for a sewing machine according to an embodiment of the present invention. FIG. 2 is an exploded perspective view in which the internal configuration of the control box 10 is not shown.
The control box 10 of the sewing machine according to the present embodiment has a substantially rectangular parallelepiped shape as a whole, and a sewing machine motor M is attached to a sewing machine table (not shown) so that an operation surface of an operation panel 30 described later faces a sewing machine user. (See FIG. 5). In the following description, when words indicating directions, i.e., left, right, up, down, front, and back are used, the control box 10 indicates that the operation surface 32 of the operation panel 30 is used by the sewing machine user. Each direction in the state where it is installed on the sewing machine table so as to face each other shall be indicated.
As shown in FIG. 1, the control box 10 of the sewing machine includes a housing 20 having an opening 21 on a front surface (a surface facing a user of the sewing machine) in an installed state, and the housing 20 so as to cover the opening 21. An operation panel 30 that is detachably attached to the operation panel 30, a common circuit board 40 (see FIG. 3) that is supported and installed inside the housing 20, and an individual circuit board 50 that is supported and installed on the back surface of the operation panel 30 (see FIG. 5). See).

(Casing)
As shown in FIG. 2, the housing 20 mainly includes an upper case 22 and a lower case 23, and has a box shape in which one surface is opened in a state of being integrally connected by a set screw (not shown). . The upper case 22 is made of a material having a good heat transfer property, for example, a metal in consideration of the heat dissipation within the case. Further, the lower case 23 is made of a resin such as plastic for weight reduction.

FIG. 3 is a front view showing the housing 20 and its inside as viewed from the opening 21. The opening 21 is closed when the operation panel 30 is attached. As shown in FIG. 3, two rotation shaft portions 24 are provided at the lower portion of the edge portion of the opening 21 so that the distal end portion of a support arm 37 of the operation panel 30 described later is rotatably engaged. ing. As a result, the operation panel 30 rotates around the lower portion of the edge portion of the opening 21 and performs an opening / closing operation on the opening 21.
In addition, on the inside of the housing 20, a common circuit board 40 is supported and installed by screwing via a plurality of boss portions 25 a extending downward from the ceiling surface 25 in the vicinity of the ceiling surface 25.

Reference numeral 26 shown in FIGS. 1 to 3 denotes a pedal sensor. The operation lever 26a of the pedal sensor 26 is connected to the operation pedal of the sewing machine when the control box 10 is installed, and detects the depression position of the operation pedal.
Reference numeral 27 denotes a bracket that supports the control box 25 on a sewing machine motor M that is a main driving source of each part of the sewing machine (see FIG. 5). A mounting bracket (not shown) is provided on the upper portion of the sewing machine motor M, and the sewing machine motor M is attached to a sewing machine table by being screwed through the mounting bracket. Therefore, the control box 25 is attached to the sewing machine table via the motor M. In other words, when the control box 25 is installed on a sewing machine table, the sewing machine motor M is arranged on the upper part thereof. Therefore, when the sewing machine motor M has a ventilation cooling device, the ventilation is received simultaneously with the sewing machine motor M, and the control box 10 is also cooled.

(control panel)
The operation panel 30 is formed in a box shape in which one surface is the same size as the opening 21 of the housing 20 and the opening 31 faces the opening 21 of the housing 20. 30 is mounted on the housing 20. In such a mounted state, the surface opposite to the opening 31 is the operation surface 32 facing the user side of the sewing machine.
FIG. 4 is a front view of the operation panel 30, and an operation surface 32 of the operation panel 30 appears in the figure. In the left area of the operation surface 32, a display 33 of the model name of the sewing machine corresponding to the control box 10 is attached. In addition, a display 34 for displaying control-related information or numerical data is provided in an area slightly to the right of the center, and operation input switches 35 and 35 are provided below and to the right, respectively. The display contents of the model name display 33, the presence / absence of the display 34 and the operation input switch 35, the arrangement, the number, and the like vary depending on the model to be controlled by the sewing machine, and the operation panel 30 depends on the model of the sewing machine. Individually adapted ones are used. Reference numeral 36 denotes a shell-shaped lead-out portion that guides the cable connected in the control box 10 to the outside.

FIG. 5 is a perspective view of the control box 10 with the operation panel 30 opened. As shown in the figure, the operation panel 30 includes two support arms 37 that extend toward the housing in the lower portion of the housing 20 in a state where the opening 21 of the housing 20 is closed. The operation panel 30 is formed of an elastically deformable resin or the like, and the tip of each support arm 37 is formed in a substantially C shape (the tip is not shown). The operation panel 30 can be attached to and detached from the housing 20 by fitting or pulling out the above-described rotation shaft portion 24 of the housing 20 inside the C-shape at the tip of each support arm 37.
Further, the operation panel 30 can be rotated with its lower end portion as a fulcrum in a state in which the rotation shaft portion 24 is fitted to the distal end portion of each support arm 37, and can be opened and closed by rotating with respect to the housing 20. It is possible.

(Individual circuit board)
The individual circuit board 50 is a board of a size that can be stored in the operation panel 30, and is supported inside the operation panel 30 and behind the operation surface 32. In the individual circuit board 50, electronic components are mainly mounted on the surface opposite to the surface opposite to the back surface of the operation surface 32, so that each electronic component is in a state where the operation panel 30 is rotated and opened. It will be in a state of being exposed upward. Therefore, each electronic component can be easily observed, and the individual circuit board 50 can be easily inspected, repaired, maintained, etc., and maintainability can be improved.

(Common circuit board)
The common circuit board 40 is mounted with electronic components mainly constituting a circuit section to be described later on one surface of the board, and soldered on the back surface thereof. Therefore, in the following description, the surface on which the electronic components of the common circuit board 40 are mounted is referred to as a component surface 41, and the surface on which soldering is performed is referred to as a solder surface 42 (see FIG. 3).
As described above, in the housing 20, the common circuit board 40 is supported in a state where the solder surface 42 is closely opposed to the ceiling surface 25 of the housing 20. That is, the common circuit board 4040 is located in the upper region inside the housing 20.
On the other hand, as described above, since the operation panel 30 is rotatably supported at the lower portion of the edge portion of the opening 21 of the housing 20, when the operation panel 30 is opened, the operation panel 30 is opened. It will be in the state located under the housing | casing 20 like FIG. Therefore, the operation panel 30 is separated from the component surface 41 of the common circuit board 40, and each electronic component mounted on the common circuit board 40 inside is observed in a state where the opening 21 of the housing 20 is opened. There is no hindrance. For this reason, the common circuit board 40 can be easily inspected, repaired, maintained, etc., and maintainability can be improved.
In particular, the component surface 41 of the common circuit board 40 includes a light emitting element (for example, LED) for monitoring various signals of the common circuit board 40, a switch (for example, a dip switch) for setting functions, and the like. In such a case, the configuration as described above is particularly effective because the lighting state of the light emitting element and the setting state of the switch can be easily observed.

Further, as shown in FIG. 3, the first heat generating component 43 is disposed on the solder surface 42 of the common circuit board 40 so that the heat dissipating surface 43a is in contact with the ceiling surface 25, and is a bottom surface opposite to the heat dissipating surface 43a. A terminal 44 protruding downward from 43b is attached to the common circuit board 40 by being soldered on the component surface side of the common circuit board 40. It is desirable that the heat radiating surface 43a of the first heat generating component 43 and the ceiling surface 25 are in close contact with each other, and a paste material (metal paste or the like) having excellent electrothermal properties may be inserted.
In this way, by bringing the heat radiating surface 43a of the first heat generating component 43 into contact with the ceiling surface 25, the heat radiating surface 43a is released to the upper case 22 of the casing 20 made of metal having good thermal conductivity through the ceiling surface 25. In addition, since the upper case 22 is cooled by the outside air, the first heat generating component 43 can be efficiently cooled.

Further, although not shown in FIG. 3, as shown in FIG. 6, the second heat generating component 44 is mounted on the component surface 41 of the common circuit board 40 via the plate-like heat radiating plate 45. Yes. The heat radiating plate 45 is screwed to a boss portion 28 extending downward from the ceiling surface 25 of the upper case 22 of the housing 20.
The second heat generating component 44 and the heat radiating plate 45 are preferably in close contact with each other, and a paste material (such as a metal paste) having excellent electrothermal properties may be interposed.
By mounting the second heat generating component 44 on the common circuit board 40 via the heat dissipation plate 45 screwed to the boss portion 28 in this way, heat conduction is performed via the heat dissipation plate 45, the boss portion 28, and the ceiling surface 25. It is possible to escape to the upper case 22 of the casing 20 made of a good metal, and the upper case 22 is cooled by outside air, so that the second heat generating component 44 can be efficiently cooled.

(Configuration of circuit unit mounted on common circuit board and individual circuit board)
FIG. 7 is a block diagram showing a configuration of circuit units mounted on the common circuit board 40 and the individual circuit board 50.
As a circuit unit mounted on the common circuit board 40, a rectifying / smoothing circuit 61 that rectifies and smoothes an input commercial AC power supply and converts it to a smooth DC power supply, and is output from the individual circuit board 50 using the smooth DC power supply as a drive source. Servo motor drive circuit 62 for driving the sewing machine motor M based on the motor control signal to be switched, the same smooth DC power supply is switched, and the control power supply (for example, 5 [V]) or the sewing machine mainly used in the individual circuit board 50 A switching power supply circuit 63 for converting into an actuator drive power supply (for example, 34 [V]) for driving various actuators (for example, a thread trimming solenoid and a presser solenoid) provided in the Based on the actuator control signal output from the individual circuit board 50 using the actuator driving power source 63 as a driving source. An actuator driving circuit 64 for driving the actuator is mounted. Further, the common circuit board 40 is equipped with connectors 65 a to 65 d for connecting the AC input power source, the sewing machine motor M, various sewing machine actuators, the individual circuit board 50, and the common circuit board 40.

As described above, it is desirable to mount only the circuit unit that is used in common on the common circuit board 40 regardless of the model of the sewing machine.
In the present embodiment, among the components mounted on the common circuit board 40, the first heat generating product 43 described above has a power element (for example, an inverter IC) constituting the servo motor driving circuit 62, The two heat generating components correspond to the output transistors constituting the power supply circuit 63 and the actuator drive circuit 64, respectively.

On the other hand, as the circuit unit mounted on the individual circuit board 50, the ROM 71 in which a program corresponding to each model of the sewing machine is mounted, and the various actuators of the sewing machine, the sewing machine motor M, etc. based on the program stored in the ROM 71. CPU 72 that performs control, RAM 73 that is used as a temporary storage area when CPU 72 performs control, interface circuit 74 that is disposed between CPU 72 and various signals that are input to and output from CPU 72, and interface circuit 74 A display 34 connected to the CPU 72, an operation human power switch 35, and the like are mounted.
Further, the individual circuit board 50 includes an operation panel 81 mounted on the head, a pedal sensor 26, a main shaft of the sewing machine, a needle position detector 82 for detecting the vertical position of the needle, and a rotational speed of the sewing machine motor. Connectors 75 a to 75 e for connecting the encoder 83, the individual circuit board 50, and the common circuit board 40 are mounted.

  Of the circuit units mounted on the individual circuit board 50, the ROM 71, the display 34, the operation input switch 35, and the like in which a program corresponding to each model of the sewing machine is mounted can be shared depending on the model of the sewing machine to be controlled. It is a circuit part that is difficult or difficult to share, and such a circuit part is desirably mounted on the individual circuit board 50.

(Operation and effect of sewing machine control box)
In the control box 10 having the above-described configuration, when the operation panel 30 holding the individual circuit board 50 corresponding to a certain type of sewing machine is provided, when the control box 10 is diverted to a different sewing machine, first, the operation panel Only 30 and the specific circuit board 50 supported by this are removed. The removal is performed by separating each support arm 37 of the operation panel 30 from the rotation shaft portion 24 on the housing 20 side. At this time, the cables connected to the individual circuit board 50 are also separated from the connectors 75a to 75e.
Then, the control panel 30 is replaced with an operation panel 30 on which a display corresponding to a new type of sewing machine is displayed and a specific circuit board 50 corresponding to the new sewing machine. The mounting operation is performed by connecting each support arm 37 of the new operation panel 30 and the rotating shaft portion 24 on the housing 20 side, and connecting the common circuit board 40 and the new individual circuit board 50 with a cable. Is called.

  As described above, in the control box 10, a circuit unit corresponding to various sewing machines is mounted on the common circuit board 40 supported by the housing 20, and a unique circuit supported by the operation panel 30 that is displayed differently for each sewing machine. Since the circuit unit specific to each type of sewing machine is mounted on the substrate 50, it is only necessary to replace the minimum configuration when dealing with other types of sewing machines, and a control box required for a plurality of sewing machines is necessary. Since the number of components can be reduced, productivity can be improved and production cost can be reduced.

  In addition, the circuit unit mounted on the control box 10 is divided into an individual circuit board 50 having a circuit unit corresponding to the model of the sewing machine and a common circuit board 40 having a circuit unit commonly used regardless of the model of the sewing machine. In this case, the rectifier circuit 61, the switching power supply circuit 62, the drive circuits 62 and 63 such as the sewing machine motor M and the actuator of the sewing machine are common circuit units that are used regardless of the type of the sewing machine. In either case, a relatively large current flows and parts having a large calorific value are used. Therefore, by installing these components with a large amount of heat generation on the common circuit board 40 and attaching them directly or indirectly to the ceiling surface of the control box with a large amount of heat dissipation, the necessary configuration of the control box In addition to reducing the number, the heat dissipation efficiency of the control box of the sewing machine can be improved.

It is a perspective view which shows the whole structure of the control box of the sewing machine which is embodiment of invention. It is a disassembled perspective view which abbreviate | omitted illustration of the internal structure of a control box. It is a front view which shows the housing | casing seen from the opening part and its inside. The front view of an operation panel is shown. It is a perspective view of the control box of the state which opened the operation panel. It is explanatory drawing which shows the mounting state to the common circuit board of the 2nd heat-emitting component. It is a block diagram which shows the structure of the circuit part of a common circuit board and an individual circuit board.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control box 20 Case 21 Opening part 25 Ceiling surface 28 Boss part 30 Operation panel 32 Operation surface 33 Display 40 Common circuit board 41 Component surface 42 Solder surface 43 First heat-emitting component 43a Heat-dissipation surface 44 Second heat-generating component 45 Heat-dissipation Board 50 Individual circuit board

Claims (4)

A housing having an opening on the front surface;
An operation panel detachably attached to the housing so as to cover the opening,
The operation surface of the operation panel is displayed according to the model of the sewing machine to be controlled,
On the back of the operation panel, a specific circuit board having a circuit unit corresponding to a sewing machine model to be controlled is supported, and a circuit unit commonly used regardless of the sewing machine model is provided on the casing. A control box for a sewing machine, which supports a common circuit board having the same. The common circuit board is attached to the ceiling surface side inside the housing with the surface opposite to the component surface facing the ceiling surface,
The sewing machine according to claim 1, wherein the operation panel is an opening of the casing and is supported at the edge of the bottom surface of the operation panel so as to be openable and closable with respect to the opening. Control box. On the solder surface of the common circuit board, the first heat generating component is equipped with the surface opposite to the heat dissipation surface facing the solder surface, and the heat dissipation surface is in contact with the ceiling surface. The control box for a sewing machine according to claim 2, wherein the control box is attached to the sewing machine. A plate-like heat sink contacting the second heat generating component mounted on the component surface of the common circuit board;
The control box for a sewing machine according to claim 2, wherein the heat radiating plate is screwed to a boss portion extending downward from a ceiling surface inside the housing.

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