KR100610410B1 - Sewing machine control box - Google Patents

Abstract

The sewing machine control box according to the present invention has an opening and closing cover 10 rotatably installed around the support shafts 21a and 21a with respect to the main body portion 100A, and an opening and closing cover when opening the opening and closing cover 10 ( 10 is a sewing machine control box 100 having a rear cover 20 having contact portions 25 and 25 in contact with 10). The contact portions 25 and 25 are installed at positions away from the support shaft in the axial direction of the support shafts 21a and 21a, and at least one of the opening and closing cover 10 and the rear cover 20 has elasticity. It is formed of ash. Moreover, when closing the opening-closing cover 10, the positioning means which performs positioning of the opening-closing cover 10 was provided.

According to this configuration, the opening and closing cover is peeled off when not needed, and the hinge coupling portion of the opening and closing cover when the opening and closing cover is reduced, while at the same time reducing the rattling noise generated in the opening and closing cover.

Description

Sewing machine control box {SEWING MACHINE CONTROL BOX}

1 is an exploded perspective view showing a sewing machine control box according to the present invention.

Figure 2 is a rear view of the rear cover constituting the sewing machine control box of Figure 1;

3 is a bottom view of the rear cover of FIG.

4 is a plan view of the opening and closing cover constituting the sewing machine control box of FIG.

FIG. 5 is a side view illustrating a coupling portion of the rear cover of FIG. 2 and the opening / closing cover of FIG. 4;

Figure 6 is a view when seeing the engaging portion of the rear cover and the opening and closing cover from the direction A of Figure 5;

7 is a cross-sectional view of the support shaft installed in the rear cover of FIG.

Figure 8 is a side view of the support arm tip installed in the opening and closing cover of Figure 4;

9 is a plan view of the uppermost cover constituting the sewing machine control box of FIG.

10 is a front view of the top cover of FIG.

11 is a cross-sectional view showing the positional relationship between the opening and closing cover when closing the opening and closing cover of FIG. 4 and the top cover of FIG.

12 is a front view showing a whole sewing machine to which a conventional sewing control box is attached.

FIG. 13 is a side view of the whole sewing machine of FIG. 12; FIG.

14 is an explanatory diagram of a conventional hinge structure.

* Description of the symbols for the main parts of the drawings *

11: support arm 11a: opening part (egress path)

12: locking piece (second locking part) 13: protrusion (positioning means)

20: rear cover (support member) 21: support shaft

21a: support shaft 25: contact portion

30: top cover 32: locking hole (first locking portion)

33: guide groove (positioning means) 100: control box

100A: main body 100B: opening and closing cover

The present invention relates to a sewing machine control box having an opening and closing cover rotatably installed about a support shaft with respect to a main body.

In the conventional industrial sewing machine, for example, as shown in Figs. 12 and 13, the control box 200 for storing various electric parts used for the control of the sewing machine 1 with a motor is provided at the bottom of the sewing table 2; It is common to attach to

However, in order to facilitate maintenance work such as detaching the control connector of the sewing machine 1 or changing the function setting of the sewing machine 1, the control unit 200 of the sewing machine 200A is shown in FIG. The opening and closing cover 201 is attached in a rotatable state.

Conventionally, for example, the attachment structure disclosed in Japanese Patent Laid-Open No. 9-19589 is known as rotatably attaching the opening / closing cover to the main body.

In this attachment structure, as shown in Fig. 14, the support shaft P is fixedly installed on the main body portion B, and the bearing portion H in the form of a two-window is formed on the resinous upper cover C, and the support groove G provided on the bearing portion H is supported. The shaft P is engaged and the upper cover C is rotatably supported with respect to the main body portion B.

When the upper cover C in the open state is pressurized in the opening direction again, a rotational force is generated by using the contact portion O in contact with the upper cover C as a supporting point, and the supporting shaft O is formed of a resinous bearing portion H by this rotational force. The upper cover C is separated from the main body portion B by elastically deforming and depressing and expanding the support groove G.

Therefore, the upper cover C is rotated more than usual, so that even if a large force is applied to the hinge coupling portions of the upper cover C and the body portion B, temporary elastic deformation occurs at the tip of the bearing portion H, and the hinge coupling portion is damaged or permanently Deformation may occur.

In addition, as the locking structure for holding the opening and closing member rotatably supported by the hinge coupling as described above, for example, the locking groove of the hook-type locking member provided in the opening and closing member is engaged in the locking groove provided in the main body. In general, a method of keeping the opening / closing member in a closed state by the elastic force due to the bending is generally used.

 However, in the attachment structure of the sewing machine upper cover described in Japanese Patent Application Laid-Open No. 9-19589, the opening and closing member is simple when applied to the opening and closing member that opens downward, for example, the opening and closing cover 201 shown in FIGS. 12 and 13. There is a problem that is separated from the main body. For example, the opening and closing member is disengaged from the main body part by the rotational force by its own gravity.

In order to solve this problem, for example, when the support groove G of the bearing portion H is sufficiently smaller than the support shaft P to prevent deviation, a large force is required when attaching the opening / closing member to the main body so that the bearing portion may be damaged or Persistent deformation can occur.

In addition, when the aforementioned locking structure is applied to the opening / closing cover 201 of the control box 200 illustrated in FIGS. 12 and 13, for example, a rattling sound generated from the opening / closing cover 201 due to the vibration of the sewing machine 1 is applied. In order to prevent the need to install the locking piece on the left and right sides of the opening and closing cover 201 in FIG. In this case, the elastic deformation amount of the two locking pieces is ideally balanced, and for this purpose, the opening and closing cover 201 should move in the left and right directions. In other words, the hinge in the axial direction is required.

Thus, in the case where the axial clearance is provided in the hinge coupling portion, for example, if the radial clearance of the support shaft is reduced in the hinge coupling portion, the opening and closing cover 201 becomes difficult to move in the left and right directions, and the opening and closing cover 201 is provided. When closing, the bias is easily generated in the amount of elastic displacement of each locking piece, and as a result, there is a problem that a rattling noise is easily generated from the vicinity of the locking piece of the opening / closing cover 201 due to the vibration of the sewing machine 1.

On the contrary, when the clearance gap in the radial direction of the support shaft is increased in the hinge coupling portion, the opening / closing cover 201 is easily moved in the left and right directions, and the rattling noise is reduced from near the locking piece of the opening / closing cover 201, but the hinge of the opening / closing cover 201 is reduced. There is a problem that rattling is likely to occur from the coupling part.

The present invention is to solve the problems as described above, when the opening and closing cover is not necessary, and when the opening and closing cover is solved the problem that the hinged portion of the opening and closing cover breaks at the same time, the lingering occurring in the opening and closing cover An object of the present invention is to provide a sewing control box capable of reducing sound.

In order to solve the above problems, the invention of claim 1 includes a main body portion fixed under a sewing table to support an electric component, and an opening and closing cover capable of supporting the main body portion so as to cover the electric component. In the sewing machine control box comprising a bearing provided on one side of the main body portion and a support shaft installed on the other side, rotatably installed about the support shaft, wherein at least one of the bearing or the support shaft is formed of a resin member.

The main body portion is provided with a contact portion capable of preventing rotation of the opening and closing cover in contact with the opening and closing cover when the opening and closing cover is opened,

The bearing is provided with an opening that opens along the direction of escape of the support shaft when the opening and closing cover is pressed in the direction of opening again from the contact position with the contact portion,

The contact portion is provided at a position separated by a predetermined amount from the support shaft in the axial direction of the support shaft.

The invention of claim 2 for solving the above problems is provided with a main body portion fixed under a sewing table to support an electric component, and an opening and closing cover capable of supporting the main body portion to cover the electric component, wherein the opening and closing cover is In the sewing machine control box comprising a bearing provided on one side of the main body portion and a support shaft installed on the other side, rotatably installed about the support shaft, wherein at least one of the bearing or the support shaft is formed of a resin member.

The main body portion is provided with a contact portion capable of preventing rotation of the opening and closing cover in contact with the opening and closing cover when the opening and closing cover is opened,

The bearing is provided with an opening that opens along the direction of escape of the support shaft when the opening and closing cover is pressed in the direction of opening again from the contact position with the contact portion,

The support shaft is formed in the circumferential direction such that the diameter of the portion not facing the opening at the time of escape is smaller than the diameter of the portion facing the opening.

Specifically, for example, the cross-sectional shape of the support shaft is formed by cutting a predetermined amount of a part of the circle, and may have a portion with a large outer circumference and a small portion.

According to the invention of claim 3, the first locking portion is provided on the main body, and the opening and closing cover is engaged with the first locking portion, and the opening and closing cover can be kept closed by the elastic force generated by the engagement. And a positioning means for positioning the opening / closing cover when the second locking portion is provided and the closing cover is closed.

Here, the first locking portion and the second locking portion may be constituted by, for example, a locking piece provided with a hook on the tip, and a locking hole engageable with the locking piece in a state in which the locking piece is bent.

In addition, the positioning means is constituted by providing recesses which can engage with the convex portions on the other side, for example, in one of the opening and closing cover and the main body portion.

The invention described in claim 4 supports the opening and closing cover to be movable in the direction in which the elastic force acts on the main body in the sewing machine control box according to claim 3.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to accompanying drawings. As shown in Fig. 1, the sewing control box 100 of the present embodiment includes a main sensor 50, a rear cover 20, a top cover 30, and a pedal sensor 44 which detects the amount of stepping of the pedal as various electric parts. And a main body portion 100A made of a power transformer 45 for supplying power to various actuators disposed on the sewing machine body, and the control plates 41, 42, 43, etc., and the main body portion 100A. It consists of an opening and closing cover 100B attached in a state.

The main frame 50 is formed by, for example, aluminum diecast, and its upper end is attached to the lower surface of the sewing table (not shown).

The control board 41 is equipped with a circuit for supplying power to the missing motor, and the control board 42 is provided with various switches for setting the function of the sewing machine, a connector for the sewing control signal, and the like.

The rear cover 20, the top cover 30, and the opening / closing cover 100B cover various electrical parts 41, 42, 43, 44, and 45 disposed on the main frame 50 to protect and block them. It is formed by various kinds of synthetic resins as a cover for carrying out.

The rear cover 20 and the top cover 30 are attached to the main frame 50 by screws.

As shown in FIGS. 1-3, the rear cover 20 has the support part 21 and the contact part 25 provided in the right and left pair by the lower surface.

Each of the supporting portions 21 is a pair of ribs 21b which are respectively placed in parallel to the lower surface of the rear cover 20, a space portion 21c formed between the ribs 21b, and each space portion 21c. It is located in the support shaft 21a which fixed both ends to the rib 21b.

Both support shafts 21a are disposed on the same straight line along the left and right directions.

On the other hand, the opening and closing cover 100B is provided with a pair of support arms 11 as bearings hinged to both the support portions 21 protruding from the lower surface of the opening and closing cover 100B. As shown in Fig. 8, both support arms 11 are designed to allow the support shaft 21a to enter and exit the arc-shaped bearing portion 11b and the bearing portion 11b to enable the support shaft 21a to be coupled to the tip. The opening 11a is formed.

The support shaft 21a is formed such that its outer circumference is larger than the width of the opening 11a (FIG. 8) of the support arm 11 so that the support arm 11 does not elastically deform the bearing portion of the support arm 11. It does not escape from 11b). A pair of support shafts 21a are respectively inserted into the bearing portions 11b of both support arms 11 so that the support portions 21 and the support arms 11 are hinged, and the opening and closing cover 100B is the rear cover 20. ) (Main body portion 100A) is rotatably supported.

Further, when the support shaft 21a is inserted into or detached from the bearing portion 11b, the support arm 11 is not damaged by the stress applied to the support arm 11 so that the bearing portion 11b and the opening 11a are not damaged. The width is preset. In addition, when the opening / closing cover 100B is pressurized in the direction of opening again from the state of FIG. 5, the opening 11a is easily opened so that the support shaft 21a easily escapes from the bearing portion 11B of the support arm 11. It is formed so as to be located in the proximity line with the circular arc line centering on the edge portion 15 of 5.

Moreover, since the width | variety length (length in the left-right direction of FIG. 4) of the support arm 11 is shorter than the width | variety length of the space part 21c, the support shaft 21a is inserted in the bearing part 11b, and the opening-closing cover 100B is carried out. ) Is attached to the rear cover 20 so that the opening / closing cover 100B can be moved a predetermined amount in the axial direction.

In addition, as shown in FIG. 7, the support shaft 21a has the shape which cut | disconnected the predetermined amount a part of circle | round | yen. That is, it is easy to enter and exit the support shaft 21a to the bearing part 11b from the direction of b1 of FIG. 7, and it is difficult to enter and support the support shaft 21a to the bearing part 11b from the b2 direction of FIG. Becomes

Accordingly, in the state of FIG. 5 in which the opening / closing cover 100B is opened and the edge portion 15 of the opening / closing cover 100B contacts the contact portion 25, the opening arm 11a follows the b1 direction, so that the support arm 11 is supported. Opening 11a at a position where the opening / closing cover 100B is rotated by 90 degrees in a rotational position of the opening / closing cover 100B, for example, in the direction of closing the opening / closing cover 100B from the state of FIG. 5. ) Is easily coupled to the bearing portion 11b of the support arm 11 along the b2 direction.

As shown in Figs. 2, 3 and 5, the contact portion 25 is located at the position where the edge portion 15 of the opening / closing cover 100B is in contact with each other when the opening / closing cover 100B is opened. It is provided in a position separated by a predetermined amount from the support shaft 21a in the axial direction. In addition, the contact portion 25 slightly protrudes from the outer surface of the rear cover 20 and is integrally formed with the rear cover.

As shown in Fig. 5, the contact portion 25 contacts the edge portion 15 of the open / close cover 100B to support the open / close cover 100B when the open / close cover 100B is opened.

When the opening and closing cover 100B is pressurized in the opening direction from the state of FIG. 5, the rotational force is generated in the clockwise direction (FIG. 5) with the contact portion 25 and the edge portion 15 of the opening and closing cover 100B as a supporting point. By this rotational force, the support shaft 21a presses and enlarges the opening 11a, and escapes from the bearing portion 11b. As a result, the engagement between the support arm 11 and the support portion 21 is released, and the opening / closing cover 100B and the rear cover 20 are separated.

Therefore, even if a large force is applied to the opening / closing cover 100B in the direction of opening the opening / closing cover 100B from the position of FIG. Since it follows the direction close to the arc, the temporary elastic deformation occurs only at the tip of the support arm 11 when the opening / closing cover 100B is out of the main body 100A, and the opening and closing cover 100B and the rear cover 20 The hinge joint does not break or cause permanent deformation.

Further, since the contact portion 25 is provided at a position away from the support shaft 21a by a predetermined amount in the axial direction of the support shaft 21a, the opening / closing cover 100B opens and closes from the state of FIG. 5 in contact with the contact portion 25. When the cover 100B is pressurized in the opening direction again, as shown in the dashed-dotted lines a1 and a2 of FIG. 6, the opening / closing cover 100B and the rear cover 20 formed of the resin material are bent. The stress applied to the support shaft 21a or the support arm 11 is buffered.

Therefore, the opening / closing cover 100B is not easily peeled off by the force which rotates by self gravity. Therefore, when the opening / closing cover 100B is not necessary, it is peeled off and falls to the ground, and the problem that the opening / closing cover 100B is damaged by this fall can be reduced.

When closing the opening / closing cover 100B, the pair of locking pieces 12 and the opening / closing cover 100B as the second locking portion engaged with the locking hole 32 of the top cover 30 are closed on the opening / closing cover 100B. At the time, the protrusion 13 engaging with the guide groove 33 of the uppermost cover 30 is provided.

As shown in FIGS. 1, 9, and 10, the uppermost cover 30 has a pair of locking grooves 32 engaging with the locking piece 12 of the opening / closing cover 100B, or protrusions of the opening / closing cover 100B. Guide grooves 33 and the like engaging with 13 are provided.

As shown in FIG. 1, the locking piece 12 is provided at an upper end of both side portions of the opening and closing cover 100B, and is integrally formed with the opening and closing cover 100B. As shown in Fig. 4, triangular locking hooks 12a are formed at the distal end of the locking piece 12 to protrude outwards.

The locking holes 32 are provided at positions corresponding to the locking pieces 12 of the opening / closing cover 100B, as shown in Figs. 1 and 11, and triangular locking projections protrude inwardly at the peripheral edges of the openings, respectively. Hook 32a is formed.

In the state which closed the opening-closing cover 100B, the locking piece 12 enters the locking hole 32, and the locking piece 12 and the locking hole 32 will be in the state which couple | bonded. At this time, the engaging piece 12 is slightly bent, and the elastic force acts in the direction in which the engaging piece 12a of the engaging piece 12 and the engaging piece 32a of the engaging hole 32 are pressed together. It becomes a state. By this elastic force, the engagement state of the engagement piece 12 and the engagement hole 32 is maintained, and the opening-closing cover 100B is kept closed. At the same time, rattling caused by the sewing machine vibration is prevented.

Pressing the locking piece 12 inwardly from this state releases the engagement between the locking latch 12a of the locking piece 12 and the locking latch 32a of the locking hole 32, and the opening and closing cover 100B is opened. It becomes a state rotatable in the direction.

In addition, as shown in Fig. 11, the engaging latch 12a of the engaging piece 12 and the engaging latch 32a of the engaging hole 32 are all formed at an acute angle to close and engage the opening and closing cover 100B. It can be done simply.

As shown in Figs. 1, 4, and 11, the protruding portion 13 is provided at the upper end of the opening / closing cover 100B and is integrally formed with the opening / closing cover 100B. The protrusion 13 is formed with a neck so as to be inserted into the guide groove 33 even if the position is slightly shifted. In addition, as shown in Fig. 11, the protrusion 13 is formed at a position near the center of the opening / closing cover 100B where the rattling is easy to be generated, that is, at a side near the side where the thickness of the opening / closing cover 100B is thin. It is intended to reduce the occurrence of rattling.

9 to 11, the guide groove 33 is provided at a position corresponding to the protrusion 13 of the opening and closing cover 100B at the lower end of the upper cover 30. Positioning means for positioning the opening / closing cover 100B is constituted as in the guide groove 33 and the projection 13.

In the state in which the open / close cover 100B is closed, the protrusion 13 enters the guide groove 33, and the protrusion 13 and the guide groove 33 are coupled to each other. At this time, the engagement piece 12 is positioned with respect to the engagement hole 32, and the engagement piece 12 and the engagement hole 32 are engaged by a predetermined position.

Therefore, the elastic force acting on each locking piece 12 also becomes constant, and the rattling noise generated in the engaging portion of the locking piece 12 and the locking hole 32 due to the vibration of the sewing machine can be reduced. In addition, it is possible to prevent the locking piece 12 and the locking hole 32 from being damaged by shifting the engagement position between the locking piece 12 and the locking hole 32. In addition, even if some deviation occurs in the combined position of the rear cover 20 and the upper cover 30, the engagement piece 12 and the engagement hole 32 can be engaged to a predetermined position.

And since the positioning means of the opening-closing cover 100B which consists of the guide groove 33 and the protrusion part 13 is provided, the axial diameter direction of the bearing part 11b and the support shaft 21a (radial direction of the support shaft 21a) Even when the clearance gap is reduced, when the opening / closing cover 100B is closed, the opening / closing cover 100B moves in the axial direction of the support shaft 21a, that is, the direction in which the elastic force acts, so that the amount of elastic deformation of each locking piece 12 is reduced. This is equalized. That is, if the clearance between the bearing portion 11b of the support arm 11 and the support shaft 21a in the axial diameter direction is made very small, the rattling noise generated in the engagement portion of the engagement piece 12 and the engagement hole 32 is increased. It is possible to reduce the rattling noise generated in the hinge coupling portion without making.

As described above, according to the sewing machine control device 100 of the present embodiment, the contact portion 25 is provided at a position away from the support shaft 21a in the axial direction of the support shaft 21a, and the opening / closing cover 100B and Since the rear cover 20 is each formed of a resin material (elastic member), when the opening / closing cover 100B presses the contact portion 25, both the opening and closing cover 100B and the rear cover 20 are bent and supported. The stress applied to the shaft 21a or the support arm 11 is buffered. Therefore, damage or permanent deformation of the support shaft 21a or the support arm 11 can be prevented.

In addition, when closing the opening / closing cover 100B, the positioning means composed of the guide groove 33 and the projection 13 for positioning the opening / closing cover 100B is provided. 32) can always be engaged to a predetermined position.

Moreover, when closing the opening / closing cover 100B, the positioning means which consists of the guide groove 33 and the protrusion part 13 which position the opening / closing cover 100B is provided, and the locking piece 12 and the locking hole 32 are provided. ) Can always be engaged in a predetermined position.

Therefore, the elastic force generated by the engagement between the engagement piece 12 and the engagement hole 32 also becomes constant, and the looseness generated from the engagement portion between the engagement piece 12 and the engagement hole 32 due to the vibration of the sewing machine becomes constant. You can lower the sound.

In addition, since the rear cover 20 movably supports the opening / closing cover 100B in the action direction of the elastic force, it is possible to balance the elastic force acting on the opening / closing cover 100B. As a result, the rattling sound generated from the engaging portion between the locking piece 12 and the locking hole 32 can be reduced again, and the assembling property of the opening / closing cover 100B to the main body portion 100A can be improved.

In addition, the present invention is not limited to the sewing machine control box 100 shown in the present embodiment, and other control boxes and housings are provided as long as they have an opening / closing cover (that is, an opening / closing member) rotatably installed around the support shaft. The present invention can also be applied to a box or a frame of various devices.

In this embodiment, the support arm 11 is provided in the opening and closing cover 100B, and the support part 21 is installed in the rear cover 20. However, the support arm is provided in the rear cover 20, and the opening and closing cover 100B is provided. The support shaft part can also be installed in (). Moreover, the position and quantity of a support arm and a support shaft part are also arbitrary. Similarly, the arrangement can be reversed for the engagement piece 12, the engagement hole 32, the projection 13, the guide groove 33, and the like.

In addition, in this embodiment, although the attachment position of the opening-closing cover 100B was made into the front surface of the control box 100, it is not limited to this, It may be a side surface, a lower surface, or an upper surface.

Moreover, of course, it is arbitrary also about the rotation direction of the opening-closing cover 100B, and of course, a suitable change can also be made also about a concrete detailed structure.

According to the invention of claim 1, since the contact portion is provided at a position away from the support shaft in a predetermined amount in the axial direction of the support shaft, and at least one of the support shaft or the bearing is formed of an elastic member, the support shaft or At least one of the bearings is bent to cushion the stress applied to the support shaft or the bearing supporting the support shaft.

Therefore, it is possible to prevent damage or permanent deformation of the support shaft and the bearing.

According to the invention of the second aspect, since the support shaft is formed so that the part diameter which does not face the opening at the time of escape is smaller than the diameter of the part facing the opening, the support shaft at the rotational position of the opening / closing cover at the time of escape escapes like a bearing. On the other hand, the support shaft is easily attached to the bearing in the rotational position of the other opening / closing cover.

According to the invention of claim 3, since the positioning means for positioning the opening / closing cover is provided when the opening / closing cover is closed, the first locking portion and the second locking portion can always be engaged at a predetermined position.

Therefore, the elastic force generated by the engagement of the first and second stop portions is also constant, and the rattling noise generated from the engaging portions of the first and second stop portions due to the vibration of the sewing machine can be reduced. .

In addition, it is possible to prevent the first locking portion and the second locking portion from being damaged by shifting the engagement positions of the first locking portion and the second locking portion.

In addition, the axial clearance of the support shaft and the bearing supporting the support shaft can be made very small, thereby reducing the rattling noise generated at the engaging portion of the support shaft and the bearing.

According to the invention of claim 4, since the main body portion movably supports the opening and closing cover in the action direction of the elastic force, it is possible to balance the elastic force acting on the opening and closing cover. As a result, the rattling noise generated in the engaging portions of the first and second locking portions can be further reduced, and the assemblability of the opening and closing cover to the main body portion can be improved.

Claims (4)

A main body fixed under the sewing table to support electric parts; An opening / closing cover capable of supporting the main body portion so as to cover the electric parts, and the opening / closing cover is a support shaft provided on the other side of the bearing provided on one side with respect to the main body portion, and is rotatably installed about the supporting shaft. In the sewing machine control box, wherein at least one of the bearing or the support shaft is formed of a resin member, The main body portion is provided with a contact portion to be in contact with the opening and closing cover when the opening and closing the cover to prevent the rotation of the opening and closing cover, The bearing is provided with an opening that opens along the direction of escape of the support shaft when the opening and closing cover is pressed in the direction of opening again from the contact position with the contact portion, And the contact portion is installed at a position away from the support shaft in a axial direction of the support shaft. A main body fixed under the sewing table to support electric parts; An opening / closing cover capable of supporting the main body portion so as to cover the electric component, and the opening / closing cover is a support shaft provided on the other side of the bearing provided on one side with respect to the main body portion, and rotatably around the supporting shaft. In the sewing machine control box is installed, wherein at least one of the bearing or the support shaft is formed of a resin member, The main body portion is provided with a contact portion capable of preventing rotation of the opening and closing cover in contact with the opening and closing cover when the opening and closing cover is opened, The bearing is provided with an opening that opens along the direction of escape of the support shaft when the opening and closing cover is pressed in the direction of opening again from the contact position with the contact portion, And the support shaft is formed in the circumferential direction such that the diameter of the portion not facing the opening at the time of escape is smaller than the diameter of the portion facing the opening. The method of claim 1, At the same time to install a first stop in the main body A second stop portion which is engaged with the first stop portion and is capable of holding the open / close cover closed by an elastic force generated by the engagement; And a positioning means for positioning the opening and closing cover when the opening and closing cover is closed. The method of claim 3, Missing control box, characterized in that the main body portion to support the opening and closing cover in a direction in which the elastic force acts.

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