JP2011239872A - Sewing machine - Google Patents

Abstract

When a sewing machine is driven, when a vibration is transmitted from a bearing to an arm portion, a thin face plate portion vibrates violently and generates noise. A sewing machine that reduces this noise without impairing the visibility of the operator's hand is provided.
A sewing machine includes a metal face plate 11 and a rubber-like vibration suppression member 30 made of rubber for suppressing vibration transmitted from the driven mechanism inside the arm portion 3 to the face plate 11. The vibration suppression member 30 provided over the entire surface of the face plate 11 on the rear surface of the face plate 11, and the front surface of the front end side of the arm portion 3 between the face plate 11 and the vibration suppression member 30 and the front surface of the arm portion 3. A face plate unit 10 having a packing member 70 and a metal face plate base 50 having a predetermined thickness for fixing the packing member 70 by pressing the outer peripheral side portion of the packing member 70 from the front side is provided at the front end of the arm portion 3. Provided.
[Selection] Figure 3

Description

  The present invention relates to a sewing machine including a face plate that covers an outer surface on the distal end side of an arm portion, and relates to a sewing machine that can reduce noise generated by transmission of vibration by a driven mechanism in an arm portion to the face plate during sewing.

  Conventionally, in an industrial sewing machine, a driven face mechanism such as a needle bar up-and-down moving mechanism driven by a sewing machine main shaft and a balance up-and-down swing mechanism is provided in an arm portion, and a steel face plate that covers the outer surface on the distal end side of the arm portion Is provided. Usually, the face plate is fixed to the tip of the arm part with a plurality of screws, but a sewing machine has also been proposed that can easily open and close the face plate so that the height position of the needle bar etc. can be easily adjusted in the arm part. Yes.

  For example, Patent Document 1 discloses a sewing machine face plate opening / closing mechanism including a hinge mechanism for opening and closing the face plate and a holding mechanism for holding the face plate closed by magnetic force. In this face plate opening / closing mechanism, the height position of the needle bar and presser foot can be easily adjusted without removing the face plate from the arm portion by opening and closing the face plate by the hinge mechanism.

JP 2007-37636 A

  There is a type of industrial sewing machine in which an operator performs sewing by moving a cloth while looking at the vicinity of a needle drop in front of a face plate. In such a sewing machine, the thickness of the face plate is made thin so as to ensure the visibility of the hand at the time of sewing and not to disturb the work. Since the driven mechanism is driven by the sewing machine spindle at high speed during sewing, noise and vibration are generated by the driven mechanism. In the conventional sewing machine, when the vibration by the driven mechanism is transmitted from the bearing to the arm portion, the vibration is transmitted to the thin face plate, so that the face plate vibrates violently and generates a vibration sound. Further, noise from the driven mechanism leaks from the thin face plate to the outside of the sewing machine. Therefore, there is a problem that the working environment of the worker who performs the sewing work in front of the face plate is deteriorated.

  In order to prevent the lubricant from splashing to the outside and suppress the vibration of the face plate, a sewing machine provided with a packing member extending over the entire outer surface of the arm portion between the face plate and the outer surface of the arm portion is provided. It is used for practical use. However, since the packing member is made of a non-woven fabric, the vibration transmitted to the face plate cannot be sufficiently attenuated and the sound insulation is insufficient, and the above problem has not been solved.

  An object of the present invention is to provide a sewing machine that can reduce noise generated during sewing without impairing the workability of a worker and the visibility of a hand.

  The sewing machine according to claim 1, wherein the sewing machine includes a face plate that covers an outer surface on the distal end side of the arm portion, and is a synthetic resin or rubber thin plate for suppressing vibration transmitted from the driven mechanism in the arm portion to the face plate. A vibration suppression member having a shape is provided over the entire surface of the face plate at an inner surface of the face plate or a position near the inner surface.

  In this sewing machine, when vibration generated by the driven mechanism such as the needle bar vertical movement mechanism and the balance drive mechanism during sewing is transmitted toward the face plate, the vibration suppressing member absorbs the transmitted vibration and suppresses the vibration of the face plate. To do. Since the vibration of the face plate is suppressed, noise generated during sewing is reduced.

  A sewing machine according to a second aspect is the packing according to the first aspect, wherein the packing is disposed between the face plate and the vibration suppressing member and the outer surface on the front end side of the arm portion, and extends over the entire outer surface on the front end side of the arm portion. A member and a face plate base disposed between the packing member and the vibration suppressing member are further provided.

  According to a third aspect of the present invention, in the invention of the second aspect, the face plate base is formed in a frame shape having an opening at the center thereof, and the packing member, the vibration suppressing member, and the opening of the face plate base are used as air. It is characterized by forming a layer.

  According to a fourth aspect of the present invention, in the invention of the first aspect, the vibration suppressing member can be inserted with an outer edge portion whose outer peripheral portion protrudes toward the face plate, and a screw fixed to the face plate, and an end portion of the face plate. And when the vibration suppressing member is fixed to the face plate with the screw, the face plate is in contact with the outer edge portion and the tubular portion.

  According to a fifth aspect of the present invention, in the invention of the fourth aspect, the cylindrical portion has a flange portion on the side opposite to the face plate, and a collar through which the screw can be inserted is fitted into the cylindrical portion, and the screw The head side and the flange portion are in contact with each other.

  According to the first aspect of the present invention, the thin plate-like vibration suppression member made of synthetic resin or rubber for suppressing the vibration transmitted from the driven mechanism in the arm portion to the face plate is placed on the inner surface of the face plate or a position near the inner surface. Therefore, the vibration transmitted from the driven mechanism toward the face plate can be absorbed by the vibration suppressing member. Therefore, since vibration of the face plate can be suppressed, noise generated during sewing can be reduced, and the working environment of the operator can be improved. Since it can be realized only by providing a thin plate-like vibration suppressing member, the structure for suppressing vibration does not increase in size. Therefore, the visibility of the hand at the time of sewing can be ensured, and the workability of the operator is not impaired.

  According to invention of Claim 2, it arrange | positions between a faceplate and a vibration suppression member, and the front end side outer surface of an arm part, and the packing member over the whole surface of the front end side outer surface of an arm part, a packing member, and a vibration suppression member And a face plate base disposed between the arm portion and the outer peripheral surface of the arm portion with the packing member, the lubricating oil for lubricating the driven mechanism adheres to the vibration suppression member or scatters outside. Can be prevented. Therefore, it can suppress that the performance of a vibration suppression member falls.

  According to the invention of claim 3, the face plate base is formed in a frame shape having an opening at the center thereof, and an air layer is formed by the packing member, the vibration suppressing member, and the opening of the face plate base. Noise transmitted to can be attenuated by the air layer.

  According to the invention of claim 4, the vibration suppressing member includes an outer edge portion whose outer peripheral portion protrudes toward the face plate side, a cylindrical portion that allows a screw fixed to the face plate to be inserted, and an end portion protrudes toward the face plate side. When the vibration suppressing member is fixed to the face plate with screws, the face plate, the outer edge portion, and the cylindrical portion come into contact with each other, so that the contact area between the vibration suppressing member and the face plate is reduced. Therefore, it is possible to suppress vibration from being transmitted from the vibration suppressing member to the face plate. Moreover, by integrally forming the tube portion on the vibration suppressing member, the assemblability can be improved and the manufacturing cost can be suppressed.

  According to the invention of claim 5, the cylindrical portion has a flange portion on the side opposite to the face plate, and a collar through which the screw can be inserted is fitted into the cylindrical portion, and the head portion side of the screw and the flange portion are in contact with each other. Therefore, the vibration transmitted from the driven mechanism to the face plate base can be suppressed from being transmitted to the face plate via the screw, and the vibration suppressing effect can be greatly enhanced. The vibration suppression member can be fixed to the face plate with a stable tightening torque by fixing the vibration suppression member to the face plate with a screw inserted from the inside into the collar fitted in the cylinder portion, and vibration by the vibration suppression member Variations in the suppression effect can be reduced.

It is a right view of the sewing machine which concerns on Example 1 of this invention. It is a front view of a face plate unit. It is the III-III sectional view taken on the line of FIG. It is a front view of a face plate. It is a front view of a vibration suppression member. It is a front view of a face plate base. It is a front view of a packing member. FIG. 6 is a cross-sectional view of the front end side of an arm part of a sewing machine according to a second embodiment. FIG. 6 is a cross-sectional view of the front end side of an arm part of a sewing machine according to a third embodiment.

  Hereinafter, modes for carrying out the present invention will be described.

Embodiment 1 of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, in the sewing machine M, the operator performs sewing by moving the cloth while looking at the vicinity of the needle drop near the face plate unit 10. The left and right sides in FIG. 1 are the front side and the rear side of the sewing machine M, respectively. The sewing machine M includes a bed portion 1, a leg column portion 2 erected on the rear end portion of the bed portion 1, an arm portion 3 that extends forward from the upper end portion of the leg column portion 2 and faces the bed portion 1. It has.

  A sewing machine main shaft (not shown) that is rotationally driven by a sewing machine motor (not shown) is disposed in the arm 3. A plurality of bearing metals (not shown) and ball bearings (not shown) rotatably support the sewing machine main shaft. A needle bar vertical movement mechanism (not shown) and a balance vertical swing mechanism (not shown) for swinging the balance 4 up and down are provided inside the arm portion 3 in front. The needle bar vertical movement mechanism moves the needle bar 5 up and down, and the needle bar 5 has a sewing needle 6 attached to the lower end thereof. The needle bar up-and-down movement mechanism and the balance up-and-down swing mechanism are connected to the front end portion of the sewing machine main shaft, and both the mechanisms are driven by the sewing machine main shaft. The needle bar vertical movement mechanism and the balance vertical movement mechanism correspond to the driven mechanism.

  A hand pulley 7 for manually operating the sewing machine main shaft is fixed to the rear end portion of the sewing machine main shaft. The hand pulley 7 is disposed outside the arm portion 3. A belt 8 is stretched between the hand pulley 7 and the rotary shaft of the sewing machine motor. A bed (not shown) connected to the sewing machine main shaft, a thread catching hook (not shown), a feed dog mechanism (not shown) and the like connected to the lower shaft are incorporated in the bed 1. A face plate unit 10 that covers the front surface (outer surface) of the front end side (front end side) of the arm portion 3 is fixed to the front end portion of the arm portion 3.

Next, the face plate unit 10 fixed to the front end portion of the arm portion 3 will be described.
As shown in FIGS. 2 and 3, the face plate unit 10 includes a metal face plate 11, a rubber thin plate-like vibration suppressing member 30, a metal face plate base 50, and a packing member 70 made of nonwoven fabric. It is a unitized one. The face plate unit 10 is fixed to the front end portion of the arm portion 3 with four screws 82 from the front side of the face plate unit 10. A rubber plug 23 that can be attached and detached when an operator adjusts the height position of the needle bar 5 is provided at the lower right end portion of the face plate unit 10.

  As shown in FIGS. 2 to 4, the metal thin plate-like face plate 11 is formed in a substantially rectangular shape in front view. Of the four corners of the face plate 11, circular holes 13 to 15 are formed in the vicinity of the three corners. A laterally cutout hole 16 is formed in the vicinity of the remaining corner. The circular holes 13 to 15 and the notch hole 16 are formed so that a head 82a of a screw 82 for fixing the face plate unit 10 to the arm portion 3 can be inserted.

  A large-diameter circular opening 21 is formed on the left side of the notch hole 16. The circular opening 21 is formed so that a rubber plug 23 can be inserted therethrough. Small-diameter screw holes 17 to 20 are formed below the circular holes 13 and 14, above the circular hole 15, and above the circular opening 21, respectively. The screw holes 17 to 20 are formed such that screw threads 41 b and 43 b of screws 41 and 43 for fixing the vibration suppressing member 30 to the face plate 11 can be screwed together.

  As shown in FIGS. 3 and 5, the vibration suppressing member 30 is for suppressing (absorbing) vibration transmitted from the driven mechanism in the arm portion 3 toward the face plate 11, and the rear surface of the face plate 11. (Inner surface) is provided over the entire surface. The vibration suppressing member 30 has a slightly smaller dimension than the face plate 11 and is formed in a substantially rectangular shape when viewed from the front. An outer edge portion 30 a that slightly protrudes toward the face plate 11 is formed on the outer peripheral portion on the front side of the vibration suppressing member 30. Ends on the front surface side of the flanged cylinder portions 35 to 38 described later slightly protrude toward the face plate 11, and the outer edge portion 30 a and the front surfaces of the flanged cylinder portions 35 to 38 are in close contact with (in contact with) the inner surface of the face plate 11. is doing. Therefore, a slight gap 24 is formed between the face plate 11 and the vibration suppressing member 30 over almost the entire region. The gap 24 is for attenuating vibration. Further, since the contact area between the face plate 11 and the vibration suppressing member 30 is small, the transmission of vibration from the vibration suppressing member 30 to the face plate 11 is suppressed.

  Of the four corners of the vibration suppressing member 30, circular holes 31 to 33 are formed in the vicinity of the three corners, respectively. A laterally cutout hole 34 is formed in the vicinity of the remaining corner. The head 82 a of the screw 82 is inserted into the circular holes 31 to 33 and the cutout hole 34. A large-diameter circular opening 39 is formed on the left side of the cutout hole 34, and the rubber plug 23 is inserted through the circular opening 39.

  On the lower side of the circular holes 31 and 32 on the rear surface of the vibration suppressing member 30, and on the upper side of the circular hole 33 and the circular opening 39, flanged cylindrical portions 35 to 38 are integrally formed. A metal collar 40 is attached to the inside of the flanged cylinder portions 35 to 38. The screws 41 and 43 are screwed into the screw holes 18 and 20 of the face plate 11 through the washers 41 c and 43 c from the rear side of the vibration suppressing member 30 to fix the vibration suppressing member 30 to the face plate 11. Flange 35a-38a (flange part) of the cylinder parts 35-38 with a flange is formed in the dimension larger than washer 41c, 43c. When the vibration suppressing member 30 is fixed to the face plate 11, the washers 41 c and 43 c do not contact the face plate base 50. Therefore, the vibration transmitted from the driven mechanism to the face plate base 50 can be suppressed from being transmitted to the face plate 11 via the four screws 41 and 43.

  As shown in FIGS. 3 and 7, the packing member 70 is formed between the face plate 11 and the vibration suppressing member 30 and the front end side front surface (front end side outer surface) of the arm portion 3. It is provided over The packing member 70 has a size slightly larger than the face plate 11 and is formed in a substantially rectangular shape in front view. The lower end portion of the packing member 70 protrudes below the face plate 11. Circular holes 71 to 74 are formed in the vicinity of the four corners of the packing member 70, respectively. The thread 82b of the screw 82 is inserted into these circular holes 71 to 74. A large-diameter circular opening 75 is formed in the lower right end portion of the packing member 70. The circular opening 75 faces the rubber plug 23.

  As shown in FIGS. 3 and 6, the metal face plate base 50 is a cast product having a predetermined thickness and a substantially rectangular frame shape when viewed from the front. The lower end portion of the face plate base 50 is formed in a downwardly inclined shape. The front side of the face plate base 50 has substantially the same dimensions as the face plate 11, and the rear face side of the face plate base 50 has substantially the same dimensions as the packing member 70. The packing member 70 is fixed to the face plate base 50 with an adhesive. The face plate base 50 has an opening 51 at the center thereof.

  In the vicinity of the four corners of the face plate base 50, circular holes 52 to 55 are formed, respectively. A screw thread 82b of the screw 82 is inserted into the circular holes 52 to 55. A circular opening 60 is formed at the right end portion of the lower end portion of the face plate base 50, and the rubber plug 23 is fitted into the circular opening 60.

  In the portion of the face plate base 50 facing the flanged cylindrical portions 35 to 38 of the vibration suppressing member 30, open concave portions 56 to 59 are formed on the rear surface side, respectively. The recesses 56 to 59 accommodate the flanges 35a to 38a of the flanged cylinder portions 35 to 38, the heads 41a and 43a of the screws 41 and 43, and the washers 41c and 43c. Circular holes 56a to 59a communicating with the recesses 56 to 59 are formed on the front surface of the face plate base 50, respectively. The flanged cylinder portions 35 to 38 are fitted in the circular holes 56 a to 59 a and the flanges 35 a to 38 a are in close contact with the front walls of the recesses 56 to 59.

  As shown in FIGS. 3 and 6, a sound insulating air layer 61 is formed between the packing member 70 and the vibration suppressing member 30 through the opening 51 of the face plate base 50. The air layer 61 effectively attenuates noise radiated from the driven mechanism inside the arm portion 3 when passing through the face plate unit 10.

Next, attachment of the face plate unit 10 will be described.
As shown in FIGS. 2 and 3, with the face plate unit 10 aligned with the front end of the arm portion 3, four screws 82 are inserted into the circular holes 52 to 55 from the front side of the face plate 11, and four screws are inserted. By fastening the screw 82 to the arm portion 3, the face plate unit 10 can be attached to the front surface on the front end side of the arm portion 3. At this time, the packing member 70 and the face plate base 50 are fixed in a sandwiched manner between the face plate 11 and the vibration suppressing member 30 and the front surface on the front end side of the arm portion 3.

Next, the operation and effect of the sewing machine M described above will be described.
In this sewing machine M, when vibration and noise generated by a driven mechanism such as a needle bar vertical movement mechanism and a balance driving mechanism during sewing are transmitted toward the face plate unit 10, the packing member 70 first absorbs the vibration, and the packing member The noise is attenuated by the air layer 61 inside the face plate base 50 between the vibration suppression member 30 and the vibration suppression member 30. Next, the vibration transmitted to the vibration suppressing member 30 is absorbed by the vibration suppressing member 30.

  By absorbing the vibration by the vibration suppressing member 30, the vibration of the face plate 11 can be suppressed, so that the noise generated during sewing can be reduced and the working environment of the operator can be improved. Since it can be realized simply by providing the thin plate-like vibration suppressing member 30, the structure for suppressing vibration does not increase in size. Therefore, the visibility of the hand at the time of sewing can be ensured, and the workability of the operator is not impaired.

  Between the face plate 11 and the vibration suppressing member 30 and the front end side front surface of the arm portion 3, the packing member 70 extending over the entire front end side front surface of the arm portion 3 and the outer peripheral side portion of the packing member 70 are pressed from outside. Since the face plate base 50 having a predetermined thickness for fixing the member 70 is provided in a sandwiched manner, the lubricating oil that lubricates the driven mechanism is covered with the vibration suppressing member by covering the front surface on the front end side of the arm portion 3 with the packing member 70. It can prevent adhering to 30 or scattering outside. Therefore, it can suppress that the performance of the vibration suppression member 30 falls. Since the sound insulation air layer 61 is formed between the packing member 70 and the vibration suppressing member 30 via the face plate base 50, the noise passing through the face plate 11 can be attenuated by the air layer 61.

  The four flanged cylinder portions 35 to 38 have flanges 35 a to 38 a on the side opposite to the face plate 11, and a metal collar 40 into which the screws 41 and 43 can be inserted is fitted into the flanged cylinder portions 35 to 38. Since the heads 41a and 43a side of the screws 41 and 43 and the flanges 35a to 38a are in contact with each other via the washers 41c and 43c, the vibration transmitted from the driven mechanism toward the face plate base 50 is four screws 41. , 43 can be suppressed from being transmitted to the face plate 11, and the vibration suppressing effect can be remarkably enhanced.

  When the vibration suppressing member 30 is fixed to the face plate 11 with the screw 82, the face plate 11, the outer edge portion 30a, and the flanged cylindrical portions 35 to 38 come into contact with each other, so that the contact area between the vibration suppressing member 30 and the face plate 11 is reduced. Therefore, transmission of vibration from the vibration suppressing member 30 to the face plate 11 can be suppressed.

  In addition, since the four flanged cylindrical portions 35 to 38 are integrally formed with the vibration suppressing member 30, the assemblability is improved and the manufacturing cost can be suppressed. Since the metal collars 40 and 42 mounted on the four flanged cylinder portions 35 to 38 are fixed to the face plate 11 by the four screws 41 and 43 inserted from the rear side, the vibration suppressing member with a stable tightening torque. 30 can be fixed to the face plate 11, and the variation in the vibration suppression effect by the vibration suppression member 30 can be reduced. Since the face plate unit 10 is configured by unitizing the face plate 11, the vibration suppressing member 30, the face plate base 50, and the packing member 70, the face plate unit 10 can be easily attached to the arm portion 3.

  Next, a second embodiment of the present invention will be described with reference to FIG. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described. In the second embodiment, the vibration suppressing member and the flanged cylinder portion are separated.

  As shown in FIG. 8, the front and rear surfaces of the vibration suppressing member 30 </ b> A are formed in a planar shape, and the vibration suppressing member 30 </ b> A is provided in close contact with the entire rear surface of the face plate 11. The vibration suppressing member 30A has circular holes 80 and 91 through which the heads 82a and 93a of the screws 82 and 93 for fixing the face plate unit 10A to the arm portion 3 are inserted. The vibration suppressing member 30A has circular holes 83 and 87 formed at portions facing the flanged cylindrical portions 35 to 38 of the first embodiment.

  Concave portions 84 and 88 are respectively formed in portions corresponding to the circular holes 83 and 87 of the vibration suppressing member 30A on the rear surface of the face plate base 50A. The concave portions 84 and 88 accommodate the flanges 85a and 89a of the flanged collars 85 and 89 of the vibration suppressing member 30A, the head portions 86a and 90a of the stepped screws 86 and 90, and the shaft portions 86b and 90b. Circular holes 84a and 88a communicating with the recesses 84 and 88 are formed on the front surface of the face plate base 50A, respectively. The flanged collars 85 and 89 are fitted into the circular holes 83 and 87 and the circular holes 84a and 88a, and the flanges 85a and 89a are in close contact with the front walls of the recesses 84 to 88.

  The screw holes 17 to 20 (only screw holes 18 and 20 are shown in FIG. 8) of the face plate 11 are screwed with screw threads 86c and 90c of stepped screws 86 and 90 for fixing the vibration suppressing member 30A to the face plate 11. It is made possible.

  The face plate 11, the vibration suppressing member 30A, and the face plate base 50A are fixed by stepped screws 86, 90 inserted through rubber flanged collars 85, 89. Note that the metal collar is omitted by using the stepped screws 86 and 90. In this case, the vibration of the face plate 11 can be further suppressed by the friction between the face plate 11 and the vibration suppressing member 50A by bringing the face plate 11 and the vibration suppressing member 30A into close contact with each other.

  Next, a third embodiment of the present invention will be described with reference to FIG. However, the same reference numerals are given to the same components as those in the above embodiment, and only different components will be described. In the third embodiment, the packing member and the face plate base are omitted for a sewing machine used in a dry environment in which lubrication with lubricating oil is eliminated.

  As shown in FIG. 9, the face plate unit 10B unitizes the face plate 11B and the vibration suppressing member 30B. The front surface side of the face plate 11B is formed in an inclined shape that shifts toward the arm portion 3 as it goes downward. The inclination angle of the lower half part on the front side of the face plate 11B is larger than the inclination angle of the upper half part. A rectangular frame-shaped outer frame portion 100 protruding toward the vibration suppressing member 30B is formed on the outer peripheral portion on the rear surface side of the face plate 11B. On the rear surface side of the face plate 11 </ b> B, a recess 101 is formed in a part surrounded by the outer frame part 100.

  On the front side near the four corners of the face plate 11B, concave portions 94 and 97 that can accommodate the head portions 95a and 98a of the stepped screws 95 and 98 and the shaft portions 95b and 98b are formed. Circular holes 94a and 97a communicating with the recesses 94 and 97 are formed on the rear surface side near the four corners of the face plate 11B.

  The vibration suppression member 30B is formed to be thinner than the vibration suppression member 30 of the first embodiment and the vibration suppression member 30A of the second embodiment. The vibration suppressing member 30B is provided over the entire surface of the face plate 11B at a position near the rear surface (position near the inner surface) of the face plate 11B. The face plate 11B and the vibration suppressing member 30B are fixed to the front end portion of the arm portion 3 by stepped screws 95 and 98 inserted from the front side of the face plate 11B through rubber flanged collars 96 and 99.

  An air layer 61A for sound insulation is formed between the concave portion 101 of the face plate 11B and the vibration suppressing member 30B. Since the size of the air layer 61A is larger than the air layer 61 of the first and second embodiments, the sound insulation effect by the air layer 61A is improved. Therefore, noise can be reduced even if the thickness of the vibration suppressing member 30B is reduced.

Next, a modified example in which the above embodiment is partially modified will be described.
1] In the third embodiment, the face plate is formed by four screws inserted from the front side of the face plate 11B into a metal collar that is integrally formed with the vibration suppressing member with four flanged cylinder portions and is fitted into the flanged cylinder portion. 11B and the vibration suppressing member may be fixed to the front end portion of the arm portion 3.
2] In the above-described embodiment, a vibration suppression member made of synthetic resin may be provided instead of the rubber vibration suppression member.

  3] A plurality of ribs may be provided on the rear surfaces of the vibration suppression members 30 and 30A in the first and second embodiments and on the front surface of the vibration suppression member 30B in the third embodiment. In this case, the sound insulation effect can be further enhanced by matching the transmission loss frequency characteristics of the air layers 61 and 61A with the frequency that causes noise. Furthermore, if a sound absorbing material such as urethane foam or glass wool is disposed in the space of the air layers 61, 61A, the noise reduction effect can be further enhanced.

M sewing machine 3 arm portion 11, 11B face plate 30, 30A, 30B vibration suppression member 30a outer edge portion 35, 36, 37, 38 flanged cylinder portion 35a, 36a, 37a, 38a flange 40, 42 metal collar 41, 43 screw 50 , 50A Face plate base 51 Opening 61, 61A Air layer 70 Packing member

Claims (5)

In a sewing machine provided with a face plate covering the outer surface of the arm portion on the tip side,
A synthetic resin or rubber thin plate-like vibration suppressing member for suppressing vibration transmitted from the driven mechanism in the arm portion to the face plate is disposed on the inner surface of the face plate or in the vicinity of the inner surface over the entire face plate. A sewing machine characterized by the A packing member disposed between the face plate and the vibration suppressing member and the outer surface on the distal end side of the arm portion, and extending over the entire outer surface on the distal end side of the arm portion;
The sewing machine according to claim 1, further comprising a face plate base disposed between the packing member and the vibration suppressing member. The face plate base is formed in a frame shape with an opening at the center,
The sewing machine according to claim 2, wherein an air layer is formed by the packing member, the vibration suppressing member, and the opening of the face plate base. The vibration suppressing member has an outer edge portion whose outer peripheral portion protrudes toward the face plate side, and a cylindrical portion whose end portion protrudes toward the face plate side through which a screw fixed to the face plate can be inserted.
The sewing machine according to claim 1, wherein when the vibration suppressing member is fixed to the face plate with the screw, the face plate is in contact with the outer edge portion and the cylindrical portion. The cylinder part has a flange part on the opposite side to the face plate,
The sewing machine according to claim 4, wherein a collar through which the screw can be inserted is fitted into the cylindrical portion, and a head portion side of the screw and the flange portion are in contact with each other.