JP2002239277A - Presser bar lifter device for cylindrical sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a presser bar lifter device for a cylindrical sewing machine having a presser bar lifter pedal excellent in operability and workability. SOLUTION: A driving force transmitting means 54 is provided with a presser bar lifter driving shaft 47 disposed inside a bed supporting part 4 or a base of a sewing machine head 5, a presser bar lifter connecting rod 46, a presser bar lifter connecting link 45 and a presser bar lifter link 42 in which one end thereof is placed on a lower face of a presser bar holder 12 fixed on a presser bar 8 in a manner that the presser bar lifter link 42 is able to be brought into contact with or apart from the lower face and the other end is connected with the other end of the presser bar lifter connecting link 45. An operation means 52 is provided with a pedal connecting link 49 connected with a presser bar lifter driving shaft 47 and the presser bar lifter pedal 51 connected with the pedal connecting link 49 via a connecting member 50. Operating the presser bar lifter pedal 51 rotates the presser bar lifter driving shaft 47 to move a cloth presser 9 up and down.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-up device for a cylinder-type sewing machine, and more particularly to a press-up device for a cylinder-type sewing machine in which a presser foot can be easily moved up and down by operating a press-up pedal. About.

[0002]

2. Description of the Related Art Conventionally, in a sewing machine, particularly an industrial sewing machine, when a cylindrical sewing product is sewn along a circumferential direction, for example, when sewing a hem of pants, a leading end of a sewing machine bed is used. A cylindrical sewing machine having a substantially cylindrical portion is used. Further, in such a cylindrical sewing machine, a presser lifting device for vertically moving a cloth presser for holding a cloth at a desired position on the upper surface of a needle drop hole of a needle plate from above with an appropriate pressure is used.

FIGS. 4 to 6 show an essential part of an example of a cylindrical sewing machine provided with a presser lifting device for moving a cloth presser up and down. A conventional cylindrical sewing machine 1 is a table surface of a sewing table 2. It is configured by fixing the sewing machine main body 3 on 2a.

As shown in FIG. 4, a notch 2b is formed in a table surface 2a of the sewing table 2, and a table surface 2a located on the right side of the notch 2b in FIGS.
The bed receiving part 4 which forms a part of the sewing machine main body 3 is fixed to the upper surface of the sewing machine. On the bed receiving portion 4, the base of the sewing machine bed 5 is fixed. 4 and 5 is formed in a tubular shape, and is disposed so as to be located above the notch 2b of the sewing table 2. Further, a sewing machine arm 6 is arranged above the sewing machine bed 5 in parallel with the sewing machine bed 5. A support portion 6a is formed to extend downward at a lower portion of the base of the sewing machine arm 6 shown in FIGS. 4 and 5 on the right side. The lower end of the support portion 6a is formed at the bottom of the base of the sewing machine bed 5. It is fixed to the upper part. The vicinity of the distal end portion of the sewing machine arm 6 shown on the left side in FIGS. 4 and 5 is a surface portion 6b, and a press-up device 7 is disposed on the surface portion 6b. In addition, cylindrical sewing machine 1
4 and 5 are notches 2 of the sewing table 2 on the near side.
The b side is the operating side OS that the operator faces when performing the sewing operation, and the back side in FIGS.
The back side BS is located on the opposite side to S.

The presser lifting device 7 has a presser bar 8. The presser rod 8 is formed by a pair of upper and lower presser rod bearings (not shown) arranged on the surface 6 b of the sewing machine arm 6.
It is supported vertically and vertically reciprocally reciprocally. The lower part of the presser bar 8 projects below the surface portion 6b and is exposed to the outside of the sewing machine main body 3. At the lower end of the presser bar 8, a cloth presser 9 is fixed. The presser foot 9 is constantly urged toward the needle plate 11 provided on the leading end of the sewing machine bed 5 by the urging force of the urging spring 10 (FIG. 6).

[0006] As shown in FIG. 6, a base of a presser bar holder 12 is fixed by a set screw 13 to a longitudinally intermediate portion of the presser bar 8 located inside the surface portion 6 b of the sewing machine arm 6. The tip of the holding bar holder 12 is
5 and 6, which are orthogonal to the axial direction of FIG. 5, are horizontally projected toward the right, and the distal end of the holding rod holder 12 has a substantially flat shape for moving the holding rod 8 up and down. The upper surface of the abutting portion 14a, which is bent at the left end, which is one end of the formed press-up link 14, is disposed so as to be able to freely contact and separate so as to abut from below. The press-up link 14 is disposed inside the sewing machine arm 6 with its longitudinal direction being substantially horizontal, and the guide portion 15a of the first-step screw 15 is fitted into a substantially central portion in the longitudinal direction. Have been. The screw portion 15b of the first-stage screw 15 is screwed to a mounting portion (not shown) formed inside the sewing machine arm 6, and the press-up link 14 can swing around the first-stage screw 15. Has become.

At the right end of the press-up link 14, an elongated hole 14b penetrating in the thickness direction is formed along the longitudinal direction of the press-up link 14 in the longitudinal direction. The press-up link 14 is provided in the through hole 14b.
The tip end of a connecting pin 16a projecting in the thickness direction is fitted to the left end of the link plate 16 disposed to the right of the link plate 16.
The link plate 16 is disposed on the right side of the inside of the sewing machine arm 6 with its longitudinal direction substantially horizontal, and a guide portion 17a of the second-stage screw 17 is provided at a substantially central portion in the longitudinal direction. Mated. The screw portion 17b of the second-stage screw 17 is screwed to a mounting portion (not shown) formed inside the sewing machine arm 6, and the link plate 16 can swing around the second-stage screw 17. ing.

The right end of the link plate 16 is connected to an upper end, which is the other end of the holding link 18.
A lower end, which is one end of the press-up connecting link 18, is connected to a free end, which is a distal end of the press-up connecting arm 19. The base end of the presser-lift connecting arm 19 is
Is fixed to the rear side BS in the longitudinal direction. Further, the presser lifting drive shaft 20 is horizontally disposed inside the bed receiving portion 4 so as to be orthogonal to the longitudinal direction of the sewing machine arm 6, and both ends in the longitudinal direction are provided at the bed receiving portion. 4 is rotatably provided by a bearing (not shown) provided on a side wall portion located on the operation side OS and the back side BS. Also, the operation side O of the presser lift drive shaft 20
One end located at S is protruded to the outside of the bed receiving portion 4, and the base end of the pad connecting arm 21 is provided at the end of the presser drive shaft 20 protruded to the outside of the bed receiving portion 4. It is fixed. One end of a knee pad connection link 22 is fixed to a free end, which is the tip of the pad connection arm 21. And the other end of the knee pad connection link 22
As shown in FIGS. 4 and 5, the sewing table 2 extends below the table surface 2a, and a presser-lifting knee pad 23 is fixed to a distal end portion thereof. The pad connecting arm 21, the knee pad connecting link 22 and the press-up knee pad 23 constitute a first operating means 24 for executing a press-up operation when performing a general sewing operation.

As shown in FIGS. 4 and 5, on the lower surface of the table surface 2a of the sewing table 2 located on the back side BS from the position where the bed receiving portion 4 is disposed, a driving source for the cylindrical sewing machine 1 is provided. The sewing machine motor 25 is fixed, and the start and stop of the tubular sewing machine 1 can be selectively performed by operating a foot pedal 26 provided at a lower portion of the sewing table 2. . Further, a sewing machine drive shaft (not shown) which extends in the horizontal direction and is rotationally driven by the driving force of the sewing machine motor 25 is provided inside the sewing machine arm 6, and the rotational movement of the sewing machine drive shaft is illustrated. The needle bar 28 (FIG. 4) supporting the needle (sewing needle) 27 provided on the surface 6b of the sewing machine arm 6 is vertically and reciprocally converted into a reciprocating motion in the vertical direction by a needle bar device not provided.
It can reciprocate up and down.

[0010] Further, the presser bar holding member 12, the presser lifting link 1
4. The driving force output from the presser-lifting knee pad 23 forming a part of the first operating means 24 by the link plate 16, the presser-lift connection link 18, the presser-lift connecting arm 19, and the presser-lift drive shaft 20. A driving force transmitting means 29 for transmitting the driving force to the motor 8 is constituted.

As shown in FIGS. 5 and 6, on the rear side BS on the right end side of the press-up link 14, a base end of a connection link 32 extending substantially parallel to the press-up link 14 is not shown. Secured by screws. A free end of the connection link 32 is connected to an upper end, which is one end of a link chain 31 as a connecting member, and a lower end, which is the other end of the link chain 31, is connected to a sewing machine motor provided at a lower portion of the sewing table 2. 25 is connected to a presser foot pedal 30 which is a foot pedal provided adjacently to the right of the foot pedal 26 for driving. These lifter pedals 30
And the link chain 31, the second operation means 24A for executing the press-up operation when the operator performs the sewing operation near the needle drop position when performing the sewing operation using the attachment such as the positioning guide. It is configured.

Further, the holding bar holding member 12 and the holding member lifting link 1 are provided.
The driving force transmission means 29A for transmitting the driving force output from the presser lifting pedal 30 constituting a part of the second operation means 24A to the presser rod 8 is constituted by the connection link 4 and the connection link 32.

In the conventional lifting device 7 of the cylindrical sewing machine 1 having the above-described structure, when performing a general sewing operation, a lifting pad for the lifting device which constitutes a part of the operating means 24 by the operator's knee. By operating 23, the presser foot lifting operation of moving the work clamp 9 up and down is executed.

That is, when the presser-lifting knee pad 23 is moved rightward as shown by the arrow A in FIG. 6 by the worker's knee, the presser-lift drive shaft 20 and the base end portion are fixed to the presser-lift drive shaft 20. The presser-lifting connecting arm 19 rotates counterclockwise as shown by arrow B in FIG. 6, and the presser-lifting drive shaft 20 turns counterclockwise to move the presser-lifting connecting link 18 in FIG.
It moves upward as indicated by arrow C. The upward movement of the press-up link 18 is performed by pushing up the right end of the link plate 16 which can swing about the second-stage screw 17 as shown by the arrow D in FIG. Rotate clockwise. The rotation of the link plate 16 in the counterclockwise direction is performed by pushing down the right end of the presser link 14 that can swing about the first screw 15 connected to the left end of the link plate 16 to lift the presser. The link 14 rotates clockwise.
The clockwise rotation of the press-up link 14 moves the contact portion 14a formed at the left end of the press-up link 14 as shown in FIG.
It is raised as shown by arrow E. And the contact part 14
a, the upper end surface of the abutting portion 14a abuts on the lower end surface on the distal end side of the presser bar holder 12 during the upward movement,
The contact portion 14a rises with the presser bar holder 12. As a result, the presser foot 9 fixed to the lower end of the presser bar 8 rises, and when the presser foot 9 rises to a predetermined position, the presser lifting operation ends. When the worker removes the knee from the knee pad 23, the presser lifting drive shaft 20 rotates clockwise by the urging force of the urging spring 10, and the cloth presser 9 moves on the needle plate 11 or the needle plate 11 Descends on the sewn material placed on the garment.

Further, when the sewing operation is performed using the attachment such as a positioning guide and the operator approaches the needle drop position, a part of the operating means 24A is constituted by the operator's feet. By operating the presser foot pedal 30 to perform the presser foot lifting operation to move the work clamp 9 up and down.

That is, when the foot of the operator depresses a portion located on the back side BS of the presser foot pedal 30 and moves the presser foot pedal 30 downward as indicated by arrow F in FIG. The part is arrow G in FIG.
6, and pushes down the free end of the connection link 32 downward as indicated by arrow H in FIG. The downward movement of the connection link 32 is performed by pushing down the right end of the press-up link 14 that can swing around the first-stage screw 15 to which the base end of the connection link 32 is fixed. Rotates clockwise. The clockwise rotation of the presser lifting link 14 is
The contact portion 14a formed at the left end of the is raised as shown by the arrow E in FIG. During the upward movement of the contact portion 14a, the upper end surface of the contact portion 14a is
Abuts against the lower end surface on the tip side of
Rises with the presser bar hug 12. as a result,
The presser foot 9 fixed to the lower end of the presser bar 8 rises,
When the presser foot 9 moves up to a predetermined position, the presser lifting operation ends. When the operator releases or releases the depression of the presser foot pedal 30, the portion of the presser foot pedal 30 located on the back side BS rises by the urging force of the urging spring 10, and the presser foot link 14 moves counterclockwise. By rotating, the presser foot 9 descends on the needle plate 11 or on the sewing material placed on the needle plate 11.

[0017]

However, the above-mentioned conventional press-up device 7 for the cylindrical sewing machine 1 has a problem that the operability of the press-up pedal 30 is not good.

That is, the second operating means 24A using the presser foot pedal 30 and the link chain 31 causes the link chain 31 to come into contact with the sewing machine motor 25 so that the operation force of the presser foot pedal 30 becomes heavy, There is a problem that the sewing machine motor 25 is damaged.

In order to prevent the link chain 31 from contacting the sewing machine motor 25, the pulling of the link chain 31 becomes complicated, and the operating force of the presser foot pedal 30 is further increased.

Therefore, there is a need for a press-up device for a cylindrical sewing machine which is excellent in operability of the press-up pedal.

The present invention has been made in view of the above points, and has as its object to provide a press-up device for a cylindrical sewing machine which is excellent in operability of a press-up pedal.

[0022]

According to a first aspect of the present invention, there is provided a press-up device for a cylindrical sewing machine according to the first aspect of the present invention. A presser-lift drive shaft rotatably disposed inside the receiving portion or the base of the sewing machine bed, a presser-lift connection arm having a base end fixed to the presser-lift drive shaft, and one end of the presser-lift connection arm. And a press-up connecting link, the other end of which is disposed inside the sewing machine arm, and a swingably disposed inside of the sewing machine arm, one end of which is fixed to the intermediate portion in the longitudinal direction of the presser bar. A presser link that is disposed on the lower end surface of the presser bar hanger that is capable of coming and going, and has another end connected to the other end of the presser link.
It has a pedal connecting link connected to the presser lifting drive shaft, and a presser lifting pedal connected to the pedal connecting link via a connecting member, and operates the presser lifting pedal to rotate the presser lifting drive shaft. The presser foot is formed so as to be vertically movable. By adopting such a configuration, the connecting member can be disposed at a position where it does not interfere with other components, so that the operability of the presser foot pedal can be improved.

According to a second aspect of the present invention, the press-up device for a cylindrical sewing machine according to the present invention is characterized in that, in the first aspect, the operating means comprises a knee pad connecting link connected to a press-up drive shaft; A presser foot knee pad fixed to the link is provided, and the presser foot drive shaft is rotated by selectively operating one of the presser foot pedal and the presser foot knee pad, thereby forming the fabric presser so as to be vertically movable. On the point. By adopting such a configuration, the operator can move the presser foot up and down by selectively operating one of the presser foot pedal and the presser foot knee pad according to the position where the sewing operation is performed. can do.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. The same components as those of the above-described conventional device are denoted by the same reference numerals in the drawings, and description thereof is omitted.

As shown in FIGS. 1 to 3, the press-up device 41 of the cylindrical sewing machine 40 of the present embodiment includes a sewing machine arm 6.
Has a substantially flat press-up link 42 disposed with its longitudinal direction substantially horizontal. A bent contact portion 42a is provided at a left end portion, which is one end portion of the press-up link 42, and the contact portion 42a is provided so that the front end of the presser bar holder 12 faces upward. ing. The press-up link 42 is arranged so as to be able to swing around a stepped screw 43 fitted to an intermediate portion in the longitudinal direction, and by swinging the press-up link 42, the contact portion 42a Of the presser bar holder 12 comes into contact with and separates from below the lower end surface of the tip of the presser bar holder 12. Further, one end of a torsion coil spring 44 is locked on the upper surface of the intermediate portion in the longitudinal direction of the press-up link 42, and by locking the other end of the torsion coil spring 44 to the sewing machine arm 6, FIG. As shown by the imaginary line, the presser link 42 is urged to always rotate counterclockwise. The maximum rotation position of the presser link 42 in the counterclockwise direction is regulated by a stopper (not shown).

At the right end, which is the other end of the press-up link 42, a press-up connecting link 4 formed substantially in a flat shape.
The upper end, which is the other end of 5, is connected. The lower end, which is one end of the press-up link 45, is connected to the bed receiving portion 4.
Is connected to the free end, which is the distal end of the holding arm 46. The base end of the press-up connecting arm 46 is fixed to the intermediate portion of the press-up drive shaft 47 in the longitudinal direction. The presser lifting drive shaft 47 is disposed in the bed receiving portion 4 in the horizontal direction so as to be orthogonal to the longitudinal direction of the sewing machine arm 6, and both ends in the longitudinal direction are provided in the bed receiving portion. 4 is rotatably provided by a bearing (not shown) provided on a side wall portion located on the operation side OS and the back side BS. Further, both ends of the presser lifting drive shaft 47 located on the operation side OS and the rear side BS project outside the bed receiving portion 4, that is, outside the sewing machine main body 3. Note that the presser lifting drive shaft 47 may be provided at the base of the sewing machine bed 5.

A base end of a pad connecting arm 21 is fixed to one end of the press-up drive shaft 47 protruding from the operating side OS, and a free end of the pad connecting arm 21 is connected to a knee pad connecting link. One end of 22 is fixed. And
The other end of the knee pad connecting link 22 extends below the table surface 2a of the sewing table 2, and a holding pad 23 is fixed to the distal end.

As shown in FIG. 3, a base end of a pedal connecting arm 48 extending substantially horizontally is fixed to the other end of the presser lifting drive shaft 47 protruding from the rear side BS. A free end of the pedal connecting arm 48 is connected to a right end, which is one end of a pedal connecting link 49 extending substantially horizontally. One end of a link chain 50 as a connecting member is locked to the left end, which is the other end of the pedal connecting link 49. The other end of the link chain 50 is connected to a presser pedal 51 provided below the table surface 2 a of the sewing table 2, in this embodiment, to the right of the foot pedal 26. Another link such as a connecting rod may be used as the connecting member. Further, the left end of the pedal connection link 49 is disposed so as to be located almost directly above the presser foot pedal 51 from the back side BS of the sewing machine main body 3, and the left end of the left end of the pedal connection link 49 is provided in the notch 2 of the sewing table 2.
It is important to dispose the sewing machine motor 25 above the position b in the sense that the sewing machine motor 25 can be easily separated from the path of the link chain 50. Note that the right end, which is one end of the pedal connection link 49, may be directly fixed to the lifting drive shaft 47.

The pad connecting arm 21, the knee pad connecting link 22, and the lifting pad 23 constitute a first operating means 52A for executing a press-up operation when performing a general sewing operation. .

When the sewing operation is performed using an attachment such as a positioning guide by the pedal connecting arm 48, the pedal connecting link 49, the link chain 50, and the presser foot pedal 51, the worker moves to the needle drop position to perform the sewing operation. The second operation means 52B for executing the presser lifting operation in the case of performing is performed.

The presser bar holder 12, the presser link 4
2. The operating means 52 (reference numeral 52 denotes the first operating means 52A and the second operating means 52) provided on the sewing machine main body 3 of this embodiment by the presser-lifting connecting link 43, the presser-lifting connecting arm 46 and the presser-lifting drive shaft 47. A driving force transmitting means 54 for transmitting the driving force outputted from the means 52B) to the presser bar 8 is constituted.

The other construction is the same as that of the above-mentioned conventional cylindrical sewing machine 1, and therefore, a detailed description thereof will be omitted.

Next, the operation of this embodiment having the above-described configuration will be described.

FIGS. 1 and 2 show an initial state or a state in which the sewing operation has been completed. In this state, the work clamp 9 is lowered together with the presser bar 8. The presser foot 9 contacts the needle plate 11 from above with the urging force of the urging spring 10. As shown by the imaginary line in FIG. 3, the presser link 42 is rotated counterclockwise around the stepped screw 43 by the biasing force of the torsion coil spring 44, and the contact of the presser link 42. The upper surface of the portion 42a is spaced below the tip of the presser bar clamp 12. Then, when a sewn material such as a cloth to be sewn is placed on the needle plate 11, a presser lifting operation for raising the cloth presser 9 is executed.

The press-up operation of the press-up device 41 of the cylindrical sewing machine 40 of the present embodiment is performed by the first operating means 52A or the press-up pedal 51 having the press-up knee pad 23 provided outside the sewing machine main body 3. This is executed by selectively operating the second operation means 52B having the following.

The lifting operation by operating the lifting pad 23 constituting a part of the first operating means 52A is performed by the operator's knee by moving the knee pad 23 shown by the imaginary line in FIG. The operation is performed by operating to move rightward as indicated by an arrow a in FIG. 3 as indicated by a solid line in FIG. When the knee pad 23 shown by the imaginary line in FIG. 3 is moved rightward as shown by the solid line in FIG. 3, the knee pad connecting link 22 and the pad connecting arm 21 interlocked with the presser-up knee pad 23 are pressed. It rotates counterclockwise about the raising drive shaft 47, and as a result, the knee pad connecting link 22 and the pad connecting arm 21
Lifting drive shaft 47 connected to knee pad 23 through
Rotates counterclockwise as shown by the arrow b in FIG.

The press-up operation by operating the press-up pedal 51 which constitutes a part of the other second operating means 52B is performed by the operator's foot on the back of the press-up pedal 51 shown by an imaginary line in FIG. The operation is performed by stepping on the part located on the side BS and moving downward as indicated by an arrow a ′ in FIG. 3 as indicated by a solid line in FIG. When the back side BS of the presser foot pedal 51 shown by the imaginary line in FIG. 3 is moved downward as shown by the solid line in FIG. 3, the link chain 50 connected to the presser foot pedal 51 moves downward. The downward movement of the link chain 50 is caused by the pedal connection link 4
9 is pulled down as indicated by arrow a ″ in FIG.
Further, the downward movement of the distal end portion of the pedal connection link 49 causes the pedal connection arm 48 fixed to the base end portion of the pedal connection link 49 to move counterclockwise around the lifting drive shaft 47, As a result, the presser lifting drive shaft 47 connected to the lifter pedal 51 via the link chain 50, the pedal connection link 49, and the pedal connection arm 48 rotates counterclockwise as shown by the arrow b in FIG.

The counter-clockwise rotation of the press-up drive shaft 47 in the counterclockwise direction shown by the arrow b in FIG. 3 moves the press-up connecting arm 46 fixed to the intermediate portion of the press-up drive shaft 47 as shown by the arrow c in FIG. The counterclockwise rotation shown in FIG. 3 lowers the presser-lift connection link 45 connected to the free end of the presser-lift connection arm 46 downward as shown by arrow d in FIG. Then, by the downward movement of the press-up link 45, the right end of the press-up link 42, which is swingably disposed around the stepped screw 43, moves downward as shown by arrow e in FIG. 3 is rotated clockwise around the stepped screw 43 as shown by the solid line in FIG. Then, by the clockwise rotation of the press-up link 42, the contact portion 42a formed at the left end of the press-up link 42 moves upward as shown by the arrow f in FIG. And the contact part 42a
During the upward movement, the upper end surface of the abutting portion 42a abuts on the lower end surface on the distal end side of the presser bar holder 12, and then the abutment portion 42a rises with the presser bar holder 12 .
As a result, the cloth presser 9 fixed to the lower end of the presser bar 8
Rises, and when the presser foot 9 rises to a predetermined position, the presser lifting operation ends.

The rising position of the presser foot 9 is regulated by providing a stopper (not shown) for controlling the amount of rotation of the presser foot drive shaft 47.

When the operator removes the knee from the knee pad 23 or releases or cancels the stepping state of the presser foot pedal 51 with the foot, the presser lifting drive is performed by the biasing force of the torsion coil spring 44 and the biasing spring 10. The shaft 47 rotates clockwise and the presser foot 9 is placed on the needle plate 11 or
It descends on the sewing product placed on the needle plate 11.

As described above, the cylindrical sewing machine 40 of the present embodiment is
According to the presser lifting device 41, the first operating means 52A used for the lifting operation when performing a general sewing operation, and the second operating means 52B used for the lifting operation when performing the sewing operation using an attachment. Because it has both
The cloth presser 9 can be moved up and down by selectively operating one of the first and second operation means 52A and 52B in accordance with the position where the sewing operation is performed. Workability can be improved.

Further, according to the presser lifting device 41 of the cylindrical sewing machine 40 of the present embodiment, the left end of the pedal connecting link 49 is moved from the rear side BS of the sewing machine main body 3 to the presser lifting pedal 51.
, The pulling of the link chain 50 can be simple and easy, and the operating force of the presser foot pedal 51 can be maintained at a constant value.

Further, according to the press-up device 41 of the tubular sewing machine 40 of the present embodiment, the left end of the pedal connecting link 49 is located almost directly above the press-up pedal 51 from the back side BS of the sewing machine main body 3. Since the link chain 50 can be easily prevented from contacting the sewing machine motor 25,
It is possible to reliably prevent the disadvantage that the operation force of the presser foot pedal 51 becomes heavy. That is, the link chain 50 as a connecting member can be disposed at a position where it does not interfere with other components.

Furthermore, the cylindrical sewing machine 40 of the present embodiment
According to the presser lifting device 41, the presser lifting drive shaft 47 can be provided inside the bed receiving portion 4 of the sewing machine main body 3 or inside the base of the sewing machine bed 5, so that the presser lifting drive shaft 47 is attached to the base of the sewing machine bed 5. When provided, the bed receiving portion 4 can be used as a reservoir for lubricating oil used for lubricating a sliding portion inside the sewing machine main body 3, and no components are arranged inside the bed receiving portion 4. Moreover, since there is no through hole penetrating in the thickness direction in the side wall portion of the bed receiving portion 4, the amount of stored lubricating oil can be easily increased. This easily leads to an increase in the amount of the lubricating oil that is circulated and supplied to the inside of the sewing machine main body 3, and the time of one circulation cycle of the circulated lubricating oil can be lengthened. Oil deterioration can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, and can be variously modified as needed.

[0046]

As described above, according to the press-up device for a cylindrical sewing machine according to the first aspect of the present invention, the connecting member can be arranged at a position where it does not interfere with other parts.
An extremely excellent effect is obtained such that the operability of the presser foot pedal can be improved.

Further, according to the press-up device for a cylindrical sewing machine of the present invention, one of the press-up pedal and the press-up knee pad is operated in accordance with the position where the operator performs the sewing operation. By performing a selective operation, an extremely excellent effect such as the vertical movement of the presser foot can be achieved.

[Brief description of the drawings]

FIG. 1 is an external perspective view showing a main part of an entire configuration of an embodiment of a press-up device for a cylindrical sewing machine according to the present invention, together with a cylindrical sewing machine.

FIG. 2 is a front view of the overall configuration of the cylindrical sewing machine of FIG. 1;

FIG. 3 is a perspective view showing a main part of the presser lifting device shown in FIG. 1;

FIG. 4 is an external perspective view showing a main part of an entire configuration of an embodiment of a conventional press-up device for a cylindrical sewing machine together with the cylindrical sewing machine.

FIG. 5 is a front view of the overall configuration of the cylindrical sewing machine of FIG. 4;

FIG. 6 is a perspective view showing a main part of the presser lifting device of FIG. 4;

[Explanation of symbols]

 2 Sewing table 2a Table surface 2b Notch 3 Sewing machine body 4 Bed receiving part 5 Sewing machine bed 6 Sewing arm 8 Presser bar 9 Cloth presser 12 Presser bar holding 21 Pad connecting arm 22 Knee pad connecting link 23 Pressing knee pad 25 Sewing machine motor 40 Cylindrical sewing machine 41 press-up device 42 press-up link 42a abutment portion 45 press-up connecting link 46 press-up connecting arm 47 press-up drive shaft 48 pedal connecting arm 49 pedal connecting link 50 link chain 51 press-up pedal 52 operating means 52A 1 operation means 52B second operation means 54 driving force transmission means OS operation side BS back side

Continued on the front page (72) Inventor Yoshihiro Harada 2207-1, Sasabushi, Shinji-cho, Yatsuka-gun, Shimane F-term (reference) in Nakajima Works 3B150 AA00 BA03 BA10 CE03 CE23 EA12 EA13 GA04 JA28

Claims (2)

[Claims] 1. A presser bar movably supported by a sewing machine arm of a sewing machine main body of a cylindrical sewing machine, a cloth presser fixed to a lower end portion of the presser bar, and a presser bar disposed outside the sewing machine main body. Operating means, and driving force transmitting means disposed on the sewing machine main body for transmitting driving force output from the operating means to the presser bar, and operating the operating means to operate the cloth presser. In a press-up device for a cylindrical sewing machine formed to be vertically movable, the driving force transmission means includes a press-up drive shaft rotatably disposed inside a bed receiving portion of the sewing machine main body or a base portion of the sewing machine bed, A presser-lift connecting arm having a base end secured to the presser-lift drive shaft; a presser lift having one end connected to the distal end of the presser-lift connecting arm and the other end disposed inside the sewing machine arm. A connecting link; One end is swingably disposed inside the thin arm, and one end is disposed so as to be able to contact and separate from the lower end surface of a presser bar holder fixed to a longitudinally intermediate portion of the presser bar, and the other end is the presser lifter. A lifter link connected to the other end of the connection link, wherein the operating means includes a pedal connection link connected to the lifter drive shaft;
A presser foot pedal connected to the pedal connection link via a connecting member, wherein the presser foot drive shaft is rotated by operating the presser foot pedal, and the cloth presser is formed to be vertically movable. A presser lifting device for a cylindrical sewing machine. 2. The operating means has a knee pad connecting link connected to the presser lifting drive shaft, and a presser knee pad fixed to the knee pad connecting link. 2. The presser lifting device for a cylindrical sewing machine according to claim 1, wherein the presser foot drive shaft is rotated by selectively operating one of the knee pads to move the cloth presser up and down. .