CN102251359B - Sewing machine and panel member - Google Patents

Abstract

The sewing machine of the present invention includes a panel member at the left end (front end) of the machine arm. The panel component includes a panel, a vibration suppression member, a pad member, and a panel base. The panels are metal. The vibration suppressing member is made of rubber, has a thin plate shape, and is provided on the entire right surface (inner surface) of the panel. The vibration during sewing is transmitted to the panel from the driven mechanism inside the machine arm. The vibration suppressing member can suppress vibration. The pad member is located between the vibration suppression member and the left end of the arm, and covers the opening of the left end of the arm. The panel base is made of metal with a predetermined thickness, and is fixed by pressing the outer peripheral portion of the pad member from the left side.

Description

Sewing Machine and Panel Parts

technical field

The present invention relates to a sewing machine including a panel covering an opening at an end of a machine arm, and a panel member that can be mounted on the sewing machine. Specifically, it relates to a sewing machine and a panel member capable of reducing noise generated by transmission of vibration of a driven mechanism in an arm portion to a panel during sewing.

Background technique

An industrial sewing machine includes a driven mechanism in a machine arm. The driven mechanism is the up and down movement mechanism of the needle bar and the up and down swing mechanism of the thread take-up lever. The main shaft of the sewing machine drives the up and down movement mechanism of the needle bar and the up and down swing mechanism of the thread take-up lever. Steel panels cover the openings at the ends of the arms. A number of screws usually secure the panel on the end of the arm section. There are also sewing machines that include a panel that can be easily opened and closed for the operator to adjust the height of the needle bar in the machine arm.

For example, the panel opening and closing mechanism of the sewing machine described in Japanese Patent Application Publication No. 37636 of 2007 includes a hinge mechanism and a holding mechanism. The holding mechanism magnetically holds the panel closed. The panel is opened and closed by a hinge mechanism. The operator does not need to remove the panel from the arm section. Therefore, the operator can easily adjust the height positions of the needle bar, the presser foot, and the like.

During sewing, the main shaft of the sewing machine drives the driven mechanism at high speed. Therefore, the driven mechanism vibrates to generate noise. The vibration of the driven mechanism is transmitted from the bearing to the arm and the panel. Vibration sounds are generated due to the intense vibration of the panel. The noise of the driven mechanism is transmitted from the panel to the outside of the sewing machine. Therefore, when the operator performs sewing work near the panel, the operator's working environment may be deteriorated.

The sewing machine includes a cushion member between the panel and the end of the arm portion. The pad member is provided on the entire surface of the end portion of the arm portion. The packing member not only prevents the lubricating oil from splashing to the outside, but also suppresses vibration of the panel. The pad member is a non-woven fabric. Therefore, the cushion member cannot sufficiently attenuate the vibration transmitted to the panel, and the sound insulation effect is insufficient.

Contents of the invention

An object of the present invention is to provide a sewing machine and a panel member capable of reducing noise generated during sewing.

The sewing machine of claim 1 includes a panel covering the opening at the end of the machine arm. The sewing machine further includes a vibration suppressing member made of synthetic resin or rubber, having a thin plate shape, and provided on the entire inner surface of the panel. Vibration is transmitted from the driven mechanism to the panel. The vibration suppressing member absorbs vibration. Therefore, the sewing machine can suppress the vibration of the panel and reduce the noise generated when sewing. The operator's working environment has been improved. Since the vibration suppressing member is provided on the inner surface side of the panel, the structure for suppressing vibration does not increase in size.

The sewing machine according to claim 2 further includes a pad member disposed between the vibration suppressing member and the end of the arm and covering an opening of the end of the arm, and a panel base. The panel base is disposed between the pad member and the vibration suppressing member. Lubricating oil lubricates the driven mechanism. The packing member can prevent the lubricating oil from adhering to the vibration suppressing member or splashing outside the arm portion. Therefore, the sewing machine can suppress performance degradation of the vibration suppressing member.

In the sewing machine according to claim 3, the panel base has a frame shape and has an opening at a central portion thereof. The opening of the panel base disposed between the pad member and the vibration suppressing member forms an air layer. The air layer dampens vibrations transmitted from the inside of the sewing machine arm to the panel.

In the sewing machine according to claim 4, the vibration suppressing member includes a cylindrical portion through which a screw for fixing it to the panel can be inserted, and the cylindrical portion has a flange portion on the base side of the panel, and the flange portion is interposed. between the head of the screw and the base of the panel. Vibrations are transmitted from the driven mechanism to the panel base. The flange part can suppress the vibration transmitted to the panel by the screw. Therefore, the vibration suppression effect is extremely improved.

In the sewing machine according to claim 5, the vibration suppressing member is disposed on an inner side surface of the panel, and a gap is formed between the vibration suppressing member and the panel. The gap isolates vibration. The contact area between the panel and the vibration suppressing member is small. Therefore, the sewing machine can suppress the vibration transmitted from the vibration suppressing member to the panel.

In the sewing machine according to claim 6, the vibration suppressing member has an outer edge portion and a cylindrical portion. The outer edge portion is provided on the outer peripheral portion of the vibration suppressing member and protrudes from the panel side, the cylindrical portion can pass through a screw for fixing the vibration suppressing member to the panel, and the cylindrical portion The end portion protrudes from the panel side, and the panel contacts the outer edge portion and the cylindrical portion when the vibration suppressing member is fixed to the panel by the screw. The contact area between the vibration suppressing member and the panel is small. Therefore, the sewing machine can suppress the vibration transmitted from the vibration suppressing member to the panel.

The sewing machine according to claim 7 further includes a plurality of protrusions protruding from the inner side of the panel toward the vibration suppressing member. The air layer between the panel and the vibration suppressing member has transmission loss frequency characteristics. The plurality of protrusions divide the air layer into a plurality of air layers. When the transmission loss frequency characteristics of the divided air layers are substantially equal to the vibration frequency characteristics, the vibration transmitted to the panel is reduced.

The sewing machine according to claim 8 further includes a sound absorbing material arranged in the gap. Therefore, the noise reduction effect can be further improved.

The sewing machine according to claim 9 further includes a ring-shaped member capable of passing the screw and fitted inside the cylindrical portion. Screws are inserted through the ring member to fix the vibration suppressing member to the panel. The sewing machine can fix the vibration suppressing member to the panel with a stable tightening torque. The sewing machine can reduce unevenness in the vibration suppression effect of the vibration suppression member.

The sewing machine according to claim 10 further includes a sound absorbing material arranged in the space of the air layer. Therefore, the noise reduction effect can be further improved.

In the sewing machine according to claim 11, the vibration suppressing member is in close contact with an inner surface of the panel. The friction between the panel and the vibration suppressing member can further suppress the vibration of the panel.

The panel member of Claim 12 can be attached to a sewing machine. The panel part includes a panel and a vibration suppressing member, and the panel is larger than an opening at an end of an arm of the sewing machine. The vibration suppressing member is made of synthetic resin or rubber, has a thin plate shape, and is provided on the entire inner surface of the panel. Vibration is transmitted from the driven mechanism to the panel. The vibration suppressing member absorbs vibration. Therefore, the panel member can suppress vibration of the panel and reduce noise generated during sewing. The operator's working environment has been improved. Since the vibration suppressing member is provided on the inner side of the panel, the structure for suppressing vibration does not increase in size.

The panel component of claim 13 further includes a pad member and a panel base. The spacer member is arranged on a side opposite to the panel side of the vibration suppressing member, and is larger than the opening. The panel base is located between the pad member and the vibration suppressing member. Lubricating oil lubricates the driven mechanism. The packing member can prevent the lubricating oil from adhering to the vibration suppressing member or splashing outside the arm portion. Therefore, the panel member can suppress performance degradation of the vibration suppressing member.

In the panel member according to claim 14, the panel base has a frame shape and has an opening at a central portion thereof. The opening of the panel base disposed between the pad member and the vibration suppressing member forms an air layer. The air layer dampens the vibrations transmitted to the panel.

In the panel component according to claim 15, the vibration suppressing member includes a cylindrical portion through which a screw for fixing it to the panel can be inserted, and the cylindrical portion has a flange portion on the panel base side, and the flange portion between the head of the screw and the base of the panel. Vibrations are transmitted from the driven mechanism to the panel base. The flange part can suppress the vibration transmitted to the panel by the screw. Therefore, the vibration suppression effect is extremely improved.

In the panel component according to claim 16, the vibration suppressing member is disposed on an inner side surface of the panel, and a gap is formed between the vibration suppressing member and the panel. The gap isolates vibration. The contact area between the panel and the vibration suppressing member is small. Therefore, the panel member can suppress the vibration transmitted from the vibration suppression member to the panel.

In the panel member according to claim 17, the vibration suppressing member has an outer edge portion and a cylindrical portion. The outer edge portion is provided on an outer peripheral portion of the vibration suppressing member, and protrudes toward a panel side. The cylindrical portion is capable of passing a screw for fixing the vibration suppressing member to the panel, and an end portion of the cylindrical portion protrudes from the panel side. When the screws fix the vibration suppression member to the panel, the panel is in contact with the outer edge portion and the cylindrical portion. The contact area between the vibration suppressing member and the panel is small. Therefore, the panel member can suppress the vibration transmitted from the vibration suppression member to the panel.

The panel member according to claim 18 further includes a plurality of protrusions protruding from the inner side of the panel to the vibration suppressing member. The air layer between the panel and the vibration suppressing member has transmission loss frequency characteristics. The plurality of protrusions divide the air layer into a plurality of air layers. When the transmission loss frequency characteristics of the divided air layers are substantially equal to the vibration frequency characteristics, the vibration transmitted to the panel is reduced.

The panel member according to claim 19 further includes a sound absorbing material arranged in the gap. Therefore, the noise reduction effect can be further improved.

The panel member according to claim 20 further includes an annular member through which the screw can be inserted and fitted inside the cylindrical portion. Screws are inserted through the ring member to fix the vibration suppressing member to the panel. The panel member can fix the vibration suppressing member to the panel with a stable tightening torque. The panel member can reduce unevenness in the vibration suppression effect of the vibration suppression member.

The panel member according to claim 21 further includes a sound absorbing material arranged in the space of the air layer. Therefore, the noise reduction effect can be further improved.

In the panel component according to claim 22, the vibration suppressing member is in close contact with an inner surface of the panel. The friction between the panel and the vibration suppressing member can further suppress the vibration of the panel.

Description of drawings

Fig. 1 is a front view of the sewing machine of the first embodiment.

Fig. 2 is a left side view of the panel part.

Fig. 3 is a cross-sectional view taken along line III-III in Fig. 2 .

Figure 4 is a left side view of the panel.

Fig. 5 is a left side view of a vibration suppressing member.

Fig. 6 is a left side view of the panel base.

Fig. 7 is a left side view of the pad member.

Fig. 8 is a sectional view of the left end of the arm of the sewing machine according to the second embodiment.

Fig. 9 is a sectional view of the left end of the arm of the sewing machine according to the third embodiment.

Detailed ways

Embodiment 1 of the present invention will be described below with reference to the drawings. The upper side, lower side, right side, left side, front side, and rear side of the paper in FIG. 1 are defined as the upper side, lower side, right side, left side, front side, and rear side of the sewing machine M, respectively. As shown in FIG. 1 , the sewing machine M includes a base portion 1 , a column portion 2 , and an arm portion 3 . The column part 2 is erected on the right end part of the base part 1 . The arm portion 3 extends leftward from the upper end portion of the column portion 2 and faces the base portion 1 . The operator sews while moving the cloth while observing the vicinity of the needle drop position at hand from the front side of the sewing machine M.

A sewing machine spindle (not shown) extends into the arm portion 3 . A sewing machine motor (not shown) drives the sewing machine main shaft to rotate. A plurality of bushes (not shown) and ball bearings (not shown) rotatably support the sewing machine main shaft. The sewing machine M includes a needle bar vertical movement mechanism (not shown) and a thread take-up lever vertical swing mechanism (not shown) inside the left side of the machine arm portion 3 . The up and down swing mechanism of the thread take-up lever makes the thread take-up lever 4 swing up and down. The needle bar up and down movement mechanism makes the needle bar 5 move up and down. Needle bar 5 can be equipped with machine needle 6 at its lower end. The needle bar up and down movement mechanism and the thread take-up lever up and down swing mechanism are connected with the left end of the sewing machine main shaft. The main shaft of the sewing machine drives the needle bar up and down movement mechanism and the thread take-up lever up and down swing mechanism. The up and down movement mechanism of the needle bar and the up and down swing mechanism of the thread take-up lever are equivalent to the driven mechanism.

The sewing machine M includes a hand wheel 7 . The handwheel 7 is fixed on the right end of the sewing machine main shaft, and is positioned outside the machine arm 3 . The handwheel 7 is used when the operator manually operates the sewing machine spindle. 8 belts are located on the hand wheel 7 and the sewing machine motor shaft. The base unit 1 includes a lower shaft (not shown), a shuttle, a cloth feeding mechanism (not shown) and the like inside. The lower shaft is connected with the main shaft of the sewing machine. The shuttle and the feeding mechanism are connected with the lower shaft. The panel member 10 is fixed to the left end of the arm unit 3 . The panel member 10 covers the opening of the left end portion (front end portion) of the arm portion 3 .

Next, the panel member 10 will be described. As shown in FIGS. 2 and 3 , the panel member 10 is a member including the panel 11 , the vibration suppression member 30 , the panel base 50 , and the packing member 70 . The panel 11 and the panel base 50 are made of metal. The vibration suppressing member 30 is made of rubber and has a thin plate shape. The pad member 70 is made of nonwoven fabric. Four screws 82 fix the panel member 10 to the left end of the machine arm 3 from the left side. The sewing machine M includes a detachable rubber stopper 23 at the front end portion of the lower end of the panel member 10 . When adjusting the height position of the needle bar 5, the operator removes the rubber stopper 23.

As shown in FIGS. 2 to 4 , the panel 11 has a thin plate shape and is substantially rectangular when viewed from the left side. Circular holes 13 to 15 are respectively formed near three of the four corners of panel 11 . A notch 16 is formed near the other corner. The head portion 82 a of the screw 82 can be inserted into the circular holes 13 to 15 and the notch 16 .

A circular opening 21 with a large diameter is formed on the rear side of the notch 16 . The rubber stopper 23 can be inserted into the circular opening 21 . The small-diameter screw holes 17 to 20 are respectively formed on the lower side of the circular holes 13 and 14 , the upper side of the circular hole 15 , and the upper side of the circular opening 21 . Threads 41b, 43b of screws 41, 43 are fitted into screw holes 17-20. Screws 41 and 43 fix the vibration suppression member 30 to the panel 11 .

As shown in FIGS. 3 and 5 , the vibration suppressing member 30 is provided on the entire right side (inner side) of the panel 11 . The vibration is transmitted to the panel 11 from the driven mechanism in the arm part 3 . The vibration suppression member 30 suppresses (absorbs) vibrations. The vibration suppressing member 30 has a substantially rectangular shape when viewed from the left side. The size of the vibration suppressing member 30 is slightly smaller than that of the panel 11 . The vibration suppressing member 30 has an outer edge portion 30 a on the outer peripheral portion of the left side surface. The outer edge portion 30a protrudes slightly on the left side (the panel 11 side). Left end portions of flanged cylindrical portions 35 to 38 , which will be described later, protrude slightly to the left. Left surfaces of the outer edge portion 30 a and the flanged cylindrical portions 35 to 38 are in contact with the inner surface of the panel 11 . An extremely small gap 24 exists between the panel 11 and the vibration suppressing member 30 . The gap 24 insulates against vibrations. The contact area between the panel 11 and the vibration suppressing member 30 is small. Therefore, the vibration transmitted from the vibration suppressing member 30 to the panel 11 is reduced.

Circular holes 31 to 33 are respectively formed near three of the four corners of the vibration suppressing member 30 . A notch 34 is formed near the other corner. The head portion 82 a of the screw 82 can be inserted into the circular holes 31 to 33 and the notch 34 . A circular opening 39 with a large diameter is formed on the rear side of the notch 34 . The rubber stopper 23 can be inserted into the circular opening 39 .

The cylindrical portions 35 to 38 with flanges are located below the circular holes 31 and 32 of the vibration suppressing member 30 , above the circular hole 33 , and above the circular opening 39 , respectively. The flanged cylindrical portions 35 to 38 are integrally formed with the vibration suppressing member 30 . The annular member 40 is fitted inside the flanged cylindrical portions 35 to 38 . Screws 41 and 43 are fitted into screw holes 17 to 20 of panel 11 from the right side of vibration suppressing member 30 via washers 41c and 43c. Screws 41 and 43 fix the vibration suppression member 30 to the panel 11 . The flanges 35 a to 38 a (flange portions) of the flanged cylindrical portions 35 to 38 are located on the right side of the vibration suppressing member 30 . The outer diameters of the flanges 35a to 38a are larger than the outer diameters of the washers 41c and 43c. When the screws 41 , 43 fix the vibration suppressing member 30 to the panel 11 , the washers 41 c , 43 c do not come into contact with the panel base 50 . The vibration is transmitted from the driven mechanism to the panel base 50 . The flanges 35a to 38a can suppress the vibration transmitted to the panel 11 by the screws 41 and 43 .

As shown in FIGS. 3 and 7 , the pad member 70 is located between the panel base 50 and the left end of the arm 3 . The pad member 70 covers the opening of the left end portion of the arm portion 3 . The pad member 70 has a substantially rectangular shape when viewed from the left side. The size of the pad member 70 is slightly larger than that of the panel 11 . The lower end of the pad member 70 is longer downward than the lower end of the panel 11 . Circular holes 71 to 74 are respectively formed near the four corners of the pad member 70 . The screws 82 are inserted through the circular holes 71-74, respectively. A large-diameter circular opening 75 is formed at the front end portion of the lower end of the pad member 70 . The circular opening 75 is opposite to the rubber stopper 23 .

As shown in FIG. 3 and FIG. 6 , the panel base 50 is substantially in the shape of a rectangular frame when viewed from the left side. The panel base 50 is a cast product having a predetermined thickness. The lower end of the panel base 50 is inclined downward from the left side to the right side thereof. The size of the left side of the panel base 50 is substantially equal to the size of the panel 11 . The size of the right side of the panel base 50 is substantially equal to the size of the cushion member 70 . The pad member 70 is fixed to the panel base 50 with an adhesive. The panel base 50 has an opening 51 at its central portion.

Circular holes 52 to 55 are respectively formed near the four corners of the panel base 50 . The screws 82 are inserted through the circular holes 52 to 55 . A circular opening 60 is formed at the front end portion of the lower end portion of the panel base 50 . The rubber stopper 23 is fitted into the circular opening 60 .

The panel base 50 has recesses 56 to 59 on the right side thereof. The concave portions 56 to 59 are respectively located at positions facing the flanged cylindrical portions 35 to 38 of the vibration suppressing member 30 . The recesses 56 to 59 are opened to the right side. The recessed parts 56-59 accommodate the flanges 35a-38a of the flanged cylindrical part 35-38, the head parts 41a, 43a of the screws 41, 43, and the washers 41c, 43c, respectively. Circular holes 56 a to 59 a are formed on the left side of the panel base 50 . The circular holes 56a to 59a are connected to the recesses 56 to 59, respectively. The flanged cylindrical parts 35 to 38 are respectively fitted inside the circular holes 56a to 59a. The flanges 35a to 38a are in close contact with the bottom walls of the recesses 56 to 59, respectively.

As shown in FIGS. 3 and 6 , the opening 51 of the panel base 50 between the spacer member 70 and the vibration suppressing member 30 forms an air layer 61 . The air layer 61 dampens vibrations. Noise is generated by the driven mechanism inside the arm portion 3 . When the noise passes through the panel member 10, the air layer 61 can effectively dampen the vibration of the sound wave.

Next, installation of the panel member 10 will be described. As shown in Figures 2 and 3, the operator aligns the panel part 10 with the left end of the machine arm 3, and inserts four screws 82 through the circular holes 52-55 from the left side of the panel 11 to make the screws 82 and the machine arm Part 3 is tightened. Using this method, the operator can install the panel member 10 on the left end of the arm portion 3 . The vibration suppressing member 30 and the left end portion of the arm portion 3 are fixed between the pad member 70 and the panel base 50 .

Next, the functions and effects of the sewing machine M and the panel member 10 will be described. When sewing, the driven mechanism (needle bar up and down movement mechanism, thread take-up lever up and down swing mechanism, etc.) vibrates. There are two types of vibrations. One type of vibration is transmitted to the panel member 10 , and the other type of vibration is transmitted to the panel member 10 as sound waves after being converted into noise inside the arm portion 3 . The pad member 70 absorbs vibrations. The air layer 61 is located inside the panel base 50 between the cushion member 70 and the vibration suppressing member 30 . The air layer 61 dampens the vibration of the sound waves of the noise. The vibration suppressing member 30 absorbs the transmitted vibration.

The sewing machine M and the panel member 10 can suppress vibration of the panel 11 and reduce noise generated during sewing. Therefore, the working environment of the operator can be improved. The panel member 10 includes a thin plate-shaped vibration suppressing member 30 . Since the vibration suppressing member 30 is provided inside the panel member 10, the structure for suppressing vibration does not increase in size. Therefore, the operator can ensure the visibility at hand at the time of sewing. The sewing machine M and the panel member 10 do not hinder the work efficiency of the operator.

The vibration suppressing member 30 and the left end portion of the arm portion 3 sandwich the cushion member 70 and the panel base 50 . The pad member 70 is provided on the entire surface of the left end portion of the arm portion 3 . The panel base 50 has a prescribed thickness. The panel base 50 presses and fixes the outer peripheral portion of the pad member 70 from the left side. The pad member 70 covers the opening of the left end portion of the arm portion 3 . Lubricating oil lubricates the driven mechanism. The pad member 70 prevents lubricating oil from adhering to the vibration suppressing member 30 or splashing outside the arm portion. Therefore, the sewing machine M and the panel member 10 can suppress performance degradation of the vibration suppressing member 30 . The cushion member 70 , the vibration suppression member 30 , and the opening 51 of the panel base 50 form an air layer 61 . The air layer 61 can attenuate the vibration of sound waves, and can reduce the noise passing through the panel 11 .

The four flanged cylindrical parts 35 to 38 have flanges 35a to 38a, respectively. The flanges 35 a to 38 a are located on the panel base 50 side of the vibration suppressing member 30 . The annular member 40 is fitted inside the flanged cylindrical portions 35 to 38 . The screws 41 and 43 can be inserted into the ring member 40 . The washers 41c, 43c are interposed between the heads 41a, 43a of the screws 41, 43 and the flanges 35a-38a. The flanges 35a to 38a can suppress the vibration transmitted to the panel 11 by the screws 41 and 43 . Therefore, the vibration suppressing effect can be extremely improved.

When the vibration suppression member 30 is fixed to the panel 11 by the screw 82, the panel 11 contacts the outer edge part 30a and the flanged cylindrical parts 35-38. The contact area between the vibration suppressing member 30 and the panel 11 is small. Therefore, the vibration transmitted from the vibration suppressing member 30 to the panel 11 is reduced.

The flanged cylindrical portions 35 to 38 are integrally formed with the vibration suppressing member 30 . Therefore, the assembling efficiency of the sewing machine can be improved, and the production cost can be suppressed. The annular members 40 and 42 are fitted inside the flanged cylindrical parts 35 to 38 . Four screws 41 and 43 are inserted through the annular members 40 and 42 to fix the vibration suppressing member 30 to the panel 11 . The sewing machine M and the panel member 10 can fix the vibration suppression member 30 to the panel 11 with a stable tightening torque. The sewing machine M and the panel member 10 can reduce unevenness in the vibration suppression effect of the vibration suppression member 30 . The panel component 10 is a component including a panel 11 , a vibration suppression member 30 , a panel base 50 , and a pad member 70 . The operator can easily attach the panel member 10 to the arm portion 3 .

Next, Embodiment 2 of the present invention will be described with reference to FIG. 8 . The same symbols are assigned to the same structures as in Example 1, and only different structures will be described. In Embodiment 2, the vibration suppressing member and the flanged cylindrical portion are formed independently. As shown in FIG. 8 , both left and right surfaces of the vibration suppressing member 30A are planar. The vibration suppression member 30A is in close contact with the right side surface of the panel 11 and covers the entire surface of the panel 11 . Circular holes 80, 91 are respectively formed in the upper part and the lower part of the vibration suppressing member 30A. Circular holes 81 and 92 are respectively formed in the upper part and the lower part of the panel member 10A. The heads 82a, 93a of the screws 82, 93 are inserted through the circular holes 80, 91 . The screws 82 and 93 are inserted through the circular holes 81 and 92 to fix the panel member 10A to the arm part 3 . The vibration suppression member 30A has circular holes 83 , 87 . The circular holes 83 and 87 are located at positions corresponding to the flanged cylindrical portions 35 to 38 in the first embodiment.

The panel base 50A has recesses 84 , 88 on the right side thereof. Recesses 84 , 88 open to the right and are located at positions corresponding to circular holes 83 , 87 of vibration suppressing member 30A, respectively. Recesses 84 and 88 house flanges 85 a and 89 a of flanged cylinders 85 and 89 of vibration suppression member 30A, heads 86 a and 90 a of stepped screws 86 and 90 , and shafts 86 b and 90 b. Circular holes 84a, 88a are formed on the left side of the panel base 50A, and are connected to the recesses 84, 88, respectively. The cylindrical part 85 with a flange is fitted in the circular hole 83,84a. The cylindrical part 89 with a flange is fitted in the circular hole 87,88a. The flanges 85a, 89a are in close contact with the bottom walls of the recesses 84, 88, respectively.

Threads 86c, 90c of stepped screws 86, 90 are fitted into screw holes 17-20 of panel 11 (only screw holes 18, 20 are shown in FIG. 8 ). The stepped screws 86 and 90 fix the vibration suppression member 30A to the panel 11 .

Step screws 86 , 90 pass through rubber flanged cylindrical portions 85 , 89 through panel base 50A, vibration suppression member 30A, respectively, to fix panel 11 , vibration suppression member 30A, panel base 50A. Since the panel member 10A includes the stepped screws 86, 90, a metal ring member is not required. The panel 11 is in close contact with the entire surface of the vibration suppression member 30A, and the friction between the panel 11 and the vibration suppression member 30A can further suppress the vibration of the panel 11 .

Next, Embodiment 3 of the present invention will be described with reference to FIG. 9 . The same symbols are assigned to the same structures as those in the above-mentioned embodiments, and only different structures will be described. The panel member 10B of Example 3 does not include a gasket member or a panel base. The driven mechanism of the sewing machine of Example 3 does not use lubricating oil.

As shown in FIG. 9 , the panel component 10B is a component including a panel 11B and a vibration suppressing member 30B. The panel 11B inclines downward from the left side to the right side (arm portion 3 side). The inclination angle of the lower half of the panel 11B is larger than the inclination angle of the upper half of the panel 11B. The panel 11B has an outer frame portion 100 on the outer peripheral portion of the right side. The outer frame portion 100 has a rectangular frame shape and protrudes to the right. The panel 11B has a plurality of convex portions 105 on the arm portion 3 side and on the side surrounded by the outer frame portion 100 . A plurality of protrusions 105 protrude toward the vibration suppressing member 30B from inside the panel 11B. The convex portion 105 is formed along the lateral direction of the panel 11B.

The panel 11B has recesses 94 and 97 on the left side thereof. Recesses 94 and 97 are located near the four corners of panel 11B, respectively. Recessed parts 94 and 97 are opened to the left, and accommodate head parts 95 a and 98 a and shaft parts 95 b and 98 b of stepped screws 95 and 98 . Circular holes 94a, 97a are respectively formed near the four corners on the right side of the panel 11B. The circular holes 94a, 97a are connected to the recesses 94, 97, respectively.

The vibration suppressing member 30B is thinner than the vibration suppressing member 30 of the first embodiment and the vibration suppressing member 30A of the second embodiment. The vibration suppressing member 30B is located near the right side (inner side) of the panel 11B, and covers the entire panel 11B. The stepped screws 95 and 98 are inserted through the panel 11B and the vibration suppressing member 30B from the left side of the panel 11B through rubber flanged cylindrical portions 96 and 99 . The stepped screws 95 and 98 fix the panel 11B and the vibration suppression member 30B to the left end of the arm 3 .

An air layer 61A is formed between the panel 11B and the vibration suppression member 30B. The air layer 61A attenuates the vibration of sound waves. The air layer 61A is larger than the air layer 61 of Examples 1 and 2. The thickness of the vibration suppressing member 30B is thinner than the thickness of the vibration suppressing members 30 and 30A of Examples 1 and 2. Since the damping effect of the air layer 61A on vibration is higher than that of the air layer 61 of Examples 1 and 2, the air layer 61A can further reduce noise. The air layer 61A has transmission loss frequency characteristics. The transmission loss will be described below. When sound is incident on an object, part of the sound passes through the object, while the other part is absorbed and reflected by the object. The sound pressure difference between the incident sound and the sound passing through the object is called the transmission loss. The air layer 61A has sound-insulating properties within a predetermined frequency range. The range of the predetermined frequency varies according to the volume of the air layer. The plurality of protrusions 105 divides the air layer 61A into a plurality of air layers. When the transmission loss frequency characteristics of the divided air layers are substantially equal to the vibration frequency characteristics, the vibration transmitted to the panel 11B is reduced. The positions of the plurality of protrusions 105 are set at positions where the transmission loss frequency characteristic of the volume of each air layer is equal to the frequency characteristic.

Modifications in which the above-described embodiments are partially modified will be described below.

1) The flanged cylindrical portions 85 and 89 of the second embodiment may be integrally formed with the vibration suppressing member 30A. The flanged cylindrical portions 96 and 99 may be integrally formed with the vibration suppressing member 30B of the third embodiment. Metal ring members may be fitted inside the flanged cylindrical parts 96 and 99 . A screw may be inserted through the metal annular member from the left side of the panel 11B to fix the panel 11B and the vibration suppressing member 30B to the left end of the arm 3 .

2) The vibration suppressing members 30, 30A, 30B of the above-mentioned embodiments may not be made of rubber, but may be made of synthetic resin.

3) The vibration suppressing members 30 and 30A of Examples 1 and 2 may have a plurality of protrusions on the right side. The vibration suppressing member 30B of Example 3 may have a plurality of protrusions on the left side thereof. The panel 11B of the third embodiment may not have the plurality of protrusions 105 . The panel members 10, 10A, and 10B of Examples 1, 2, and 3 may include sound-absorbing materials such as polyurethane foam and glass wool in the space of the air layers 61, 61A. The noise reduction effect can be further improved.

Claims (18)

1. A sewing machine comprising a panel covering an opening at the end of a machine arm, characterized in that it also includes: a vibration suppressing member, which is made of synthetic resin or rubber, has a thin plate shape, and is provided on the entire inner surface of the panel; a pad member arranged between the vibration suppressing member and the end of the arm portion and covering the opening of the end of the arm portion; and a frame-shaped panel base disposed between the pad member and the vibration suppressing member and having an opening at a central portion thereof, The opening of the panel base disposed between the pad member and the vibration suppressing member forms an air layer. 2. The sewing machine according to claim 1, wherein: The vibration suppressing member includes a cylindrical portion through which a screw for fixing it to the panel can be inserted, The cylindrical portion has a flange portion on the panel base side, The flange portion is interposed between the head of the screw and the base of the panel. 3. The sewing machine according to claim 1, wherein: The vibration suppressing member is arranged on the inner side of the panel, and a gap is formed between the vibration suppressing member and the panel. 4. The sewing machine according to claim 3, wherein: The vibration suppressing member has an outer edge portion provided on the outer peripheral portion of the vibration suppressing member and protruding from the panel side, and a cylindrical portion capable of fixing the vibration suppressing member to the The screw on the panel is inserted through, and the end of the tube protrudes from the panel side, When the screws fix the vibration suppressing member to the panel, the panel is in contact with the outer edge portion and the cylindrical portion. 5. The sewing machine according to claim 3, wherein: A plurality of protrusions protruding from an inner side of the panel toward the vibration suppressing member are also included. 6. The sewing machine according to claim 3, wherein: It also includes a sound-absorbing material arranged in the gap. 7. The sewing machine according to claim 2 or 4, wherein: It also includes a ring-shaped member through which the screw can be inserted and fitted inside the cylindrical portion. 8. The sewing machine according to claim 1, wherein: It also includes a sound absorbing material arranged in the space of the air layer. 9. The sewing machine according to claim 1 or 2, wherein: The vibration suppressing member is in close contact with the inner surface of the panel. 10. A panel component capable of being installed on a sewing machine, characterized in that it comprises: a panel that is larger than the opening at the end of the arm of said sewing machine; a vibration suppressing member, which is made of synthetic resin or rubber, has a thin plate shape, and is provided on the entire inner surface of the panel; a pad member disposed on a side opposite to the panel side of the vibration suppressing member and larger than the opening; and a frame-shaped panel base disposed between the pad member and the vibration suppressing member and having an opening at a central portion thereof, The opening of the panel base disposed between the pad member and the vibration suppressing member forms an air layer. 11. The panel member of claim 10, wherein: The vibration suppressing member includes a cylindrical portion through which a screw for fixing it to the panel can be inserted, The cylindrical portion has a flange portion on the panel base side, The flange portion is interposed between the head of the screw and the base of the panel. 12. The panel member of claim 10, wherein: The vibration suppressing member is arranged on the inner side of the panel, and a gap is formed between the vibration suppressing member and the panel. 13. The panel member of claim 12, wherein: The vibration suppressing member has an outer edge portion provided on the outer peripheral portion of the vibration suppressing member and protruding from the panel side, and a cylindrical portion capable of fixing the vibration suppressing member to the The screw on the panel is inserted through, and the end of the tube protrudes from the panel side, When the screws fix the vibration suppressing member to the panel, the panel is in contact with the outer edge portion and the cylindrical portion. 14. The panel member of claim 12, wherein: A plurality of protrusions protruding from an inner side of the panel toward the vibration suppressing member are also included. 15. The panel member of claim 12, wherein: It also includes a sound-absorbing material arranged in the gap. 16. A panel part as claimed in claim 11 or 13, characterized in that, It also includes a ring-shaped member through which the screw can be inserted and fitted inside the cylindrical portion. 17. The panel member of claim 10, wherein: It also includes a sound absorbing material arranged in the space of the air layer. 18. A panel part as claimed in claim 10 or 11, characterized in that, The vibration suppressing member is in close contact with the inner surface of the panel.

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