JP3339726B2 - Foot mechanism of embroidery sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser foot mechanism for an embroidery sewing machine, and more particularly to a presser foot mechanism for forcibly lowering a presser foot to a use position through a lowering operation of a needle bar.

[0002]

2. Description of the Related Art Conventionally, in order to sew a colorful embroidery pattern embroidered with embroidery threads of a plurality of colors, a needle bar case having a plurality of needle bars is horizontally arranged at the front end of a sewing machine arm in the row direction of the needle bars. A multi-needle embroidery sewing machine movably supported on a sewing machine has been put to practical use. Generally, in a multi-needle embroidery sewing machine, a presser foot for holding a work cloth and the presser foot
There is provided a presser foot drive mechanism for vertically moving the needle bar in synchronization with the vertical movement of the needle bar by the driving force of the upper shaft of the sewing machine. The work cloth to be embroidered is set on the embroidery frame, and embroidery sewing is performed in a state where the embroidery frame is mounted on a movable frame that is driven independently in the X and Y directions. Here, when replacing the work cloth or switching to embroidery of the work cloth of the next embroidery frame, the presser foot switching device switches the presser foot to the retracted position in which the presser foot is raised, and thereafter, the presser foot is sewn until embroidery sewing starts. The foot is lowered from the retracted position to the use position.

[0003]

Due to a malfunction of the presser foot switching device, the presser foot stops at a retreat position or an intermediate position near the retreat position, and embroidery sewing is performed in a state where the presser foot does not descend to a normal use position. Then, there is a problem that the sewing needle at the lower end of the needle bar or the thread hook near the upper end of the sewing needle collides with the presser foot, and the sewing needle or the thread hook is damaged. SUMMARY OF THE INVENTION An object of the present invention is to provide a presser foot mechanism of an embroidery sewing machine that can reliably prevent sewing when the presser foot does not descend to a use position.

[0004]

According to a first aspect of the present invention, there is provided a presser foot mechanism for an embroidery sewing machine, comprising a presser shaft having a presser foot fixed at a lower end thereof, supported by a machine frame so as to be able to move up and down, and retracted upward. A presser shaft configured to be switchable between a retracted position and a use position where the retracted position is not retracted, a needle bar supporting a needle at a lower end thereof, and an elevating member supporting the needle bar, which are supported by the machine frame so as to be able to move up and down. In the embroidery sewing machine having a lifting member, a passive member fixed to a middle portion of the holding shaft and having a passive portion, and a lifting member integrally movable with the lifting member, and facing a passive portion of the passive member from above. A presser shaft auxiliary operating mechanism comprising an engaging member having a mating portion, wherein the presser shaft is moved from above when the elevating member descends from the top dead center through the engagement between the engaging portion and the passive portion. Presser shaft auxiliary operation mechanism configured to be lowered to the use position It is those provided.

[0005]

In the presser foot mechanism of the embroidery sewing machine according to the first aspect, the presser shaft having the presser foot fixed at the lower end can be switched between a retracted position retracted upward and a use position not retracted. Is supported by the machine frame so as to be able to move up and down. The presser shaft assisting operation mechanism includes a passive member fixed to a middle portion of the presser shaft, and an engaging member that can be moved up and down integrally with the elevating member. The member is formed with an engaging portion facing the passive portion from above, and the presser shaft assisting mechanism is configured to hold the lifting member down from the top dead center via the engagement between the engaging portion and the passive portion. Lower the shaft from above to the use position.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a multi-needle embroidery sewing machine provided in a multi-head embroidery machine. The multi-head embroidery machine M will be described. As shown in FIGS. 1 and 2, the base frame 1 extends in the left-right direction (X direction).
A substantially rectangular sewing machine support plate 2 extending in the left-right direction is arranged on the rear side of the upper surface of the embroidery machine. It is juxtaposed.

In each of the embroidery sewing machines MH1 to MH3, twelve needle bars 12 arranged in a line in the left-right direction are supported at the front end of the arm 3 so as to be vertically movable. The needle bar cases 7 that support the balances 9 so as to be swingable are each supported horizontally and horizontally movable. On the other hand, a pillar 4 is connected to the arm 3, and the pillar 4
The bed body 5 connected to the lower end of the bed is fixed on the sewing machine support plate 2, and a cylinder bed 6 extends forward from the front end of the bed body 5. A vessel (not shown) is provided.

As shown in FIGS. 1 to 3, a sewing needle 8 is attached to the lower end of each needle bar 12, and the 12 sewing needles 8 have 12 thread stands 21 on a thread stand 20 and 12 colors. The needle bar case 7 is moved in the left-right direction, and the desired one sewing needle 8 is positioned at a sewing position opposite to the needle hole at the tip of the cylinder bed 6. Is selected, the needle bar 12 and the balance 9 corresponding to the needle bar 12 are selected.
Only the embroidery stitch is formed on the work cloth by the embroidery thread of the selected color by the cooperation of the sewing needle 8 of the needle bar 12 and the thread catcher. Here, an upper shaft 18 for vertically moving the needle bar 12 and the balance 9 and a lower shaft (not shown) for rotating the thread catcher are driven to rotate by a V-belt 10 connected to a sewing machine motor (not shown). Driven by the drive shaft 11.

On the front side of the sewing machine support plate 2, there is provided a work table 13 having the same height as the upper surface of the cylinder bed 6. The work table 13 and the left and right sides of the work table 13 are provided. A pair of auxiliary tables 14.
A movable frame 16 extending in the left-right direction is placed on the movable frame 16. A drive frame 16a at the right end of the movable frame 16 is driven to move in the X direction by an X-axis drive mechanism (not shown),
The drive frame 16b and the drive frame 16a at the left end are simultaneously moved and driven in the Y direction by a Y-axis drive mechanism (not shown). That is, the movable frame 16 is independently moved and driven on the tables 13 to 15 in the X direction and the Y direction by the X-axis driving mechanism and the Y-axis driving mechanism.

Next, as shown in FIG. 3, the head 7a of the needle bar case 7 is located above the head 3a of the arm 3, and the head 7a of the needle bar case 7 The lower end of the needle bar case 7 moves to the lower end of the head 3a in the left-right direction via the lower slide mechanism 23. It is freely supported.

Next, the needle bar vertical drive mechanism will be described. As shown in FIG. 3, a base needle bar 24 is provided in the head portion 3a of the arm portion 3, and the base needle bar 24 is supported by the machine frame of the head portion 3a at its upper end and lower end. . Basic needle bar 2
An upper shaft in the arm portion 3 is provided with a needle bar holding member 26, which is externally movably fitted to the elevating member 25 and which is connected to the elevating member 25 and is externally movably fitted to the base needle bar 24. One end of a needle bar crank 27 driven by 18 is rotatably pivoted. The front end of the upper shaft 18 has a cam shaft 17
Are integrally and concentrically fixed, and a cam groove 28 for a balance driving mechanism and a cam groove 29 for a presser foot driving mechanism are formed in the cam shaft portion 17. The other end of the needle bar crank 27 is pivotally attached to the front end of the camshaft member 17.

A connecting pin 30 is fixed to each of the twelve needle bars 12 at the middle portion in the height direction, and
One connecting pin 30 and the elevating member 25 facing from the front side
Are engaged. Accordingly, when the needle bar clamp 26 moves up and down via the needle bar crank 27 by the rotation of the upper shaft 18 and the cam shaft portion 17, one of the needle bars 12 reciprocates up and down via the elevating member 25 and the connecting pin 30. Is done.

Next, a description will be given of a needle bar selection mechanism for selecting the desired needle bar 12 by moving the needle bar cases 7 of the embroidery sewing machines MH1 to MH3 in the left-right direction in synchronization with each other. As shown in FIG. 2, the arm 3 of the central embroidery sewing machine MH2
, A pair of bevel gears 3 by a stepping motor 34
A drive mechanism for rotating the cam body 37 via the fifth and 36 is provided. A plurality of bolts 38 on the needle bar case 7 are engaged with the spiral grooves of the cam body 37, and the cam 37 is rotated every one rotation of the cam body 37. Through the engagement between the body 37 and the bolt 38, the needle bar case 7 is moved leftward or rightward by one pitch of the pitch between the needle bars 12. Since the needle bar cases 7 of the embroidery sewing machines MH1 to MH3 are connected via the connection shaft 39,
The needle bar cases 7 are driven right and left synchronously.

Next, the presser foot drive mechanism 40 will be described. As shown in FIG. 4, a presser shaft 41 is disposed in the head 3 a of the arm 3 in an upright position, and a presser foot 42 is attached to a lower end of the presser shaft 41. The presser shaft 41 is vertically movably guided by an upper guide hole 43 and a lower guide hole 44 of the machine frame.
The presser shaft 5 and the presser shaft holder 45 are elastically urged downward by a spring 47 provided on the presser shaft 41. Below the presser shaft holder 45, a presser operating body 46 is externally fitted to the presser shaft 41 so as to be vertically movable, and a presser foot drive mechanism for vertically driving the presser operating body 46 in synchronization with the upper shaft 18. 40 are provided as follows.

An annular cam groove 29, which is gently curved, is formed in the cam shaft portion 17 connected to the front end of the upper shaft 18, and an L-shaped lever 48 is provided on the machine frame of the sewing machine with a pin member oriented in the left-right direction. A roller 50 pivotally attached at 49 and pivotally attached to the upper end of the short arm portion 48a of the L-shaped lever 48 in the vertical direction is provided with a cam groove 2.
9, and the front end of the substantially horizontal long arm portion 48 b of the L-shaped lever 48 is connected to the pressing operation body 46 by a link member 51. Therefore, when the upper shaft 18 rotates, the roller 50 guided by the cam groove 29 reciprocates back and forth, and the link member 51 reciprocates up and down via the L-shaped lever 48. Reciprocate. Since the presser shaft holder 45 is in contact with the upper surface of the presser operating body 46, when the presser operating body 46 reciprocates up and down, the presser shaft holder 46 and the presser shaft 41 reciprocate up and down. The vertical movement stroke from the top dead center to the bottom dead center of the presser shaft 41 during normal embroidery sewing is, for example, about 7 mm. The pin 52 fixed to the holding shaft holder 45 is guided vertically by a slit in the front wall 31 of the head 3a.
1 is restricted from rotating around the vertical axis.

Next, the presser foot switching device 60 will be described. The presser shaft switching device 60 is used to switch between a retracted position in which the presser shaft 41 is moved upward (see FIG. 6) and a use position (see FIG. 5) in embroidery sewing in which the presser shaft 41 is lowered. The presser shaft switching device 60 includes a solenoid type actuator 61, a lever member 63 that enables an output shaft 62 of the actuator 61 to be operably connected to the presser shaft holder 45, and an upward movement of the lever member 63. It is configured with a lock device 70 and the like that locks at a position so as to be unlockable.

As shown in FIGS. 5 to 9, a solenoid actuator 61 is fixed to the front wall 31 of the head 3a by a bracket 64 with its output shaft 62 facing forward. A lever member 63 disposed on the back side of the front wall 31 has a stepped screw 65 facing the front wall 31 in the front-rear direction.
The lever member 63 has a pivotal portion 63a, a lever portion 63b extending from the pivotal portion 63a toward the holding shaft 41, and a bifurcated shape connected to the upper side of the pivotal portion 63a. Of the input arm 63c and the lever 63
operating arm 63d extending to the opposite side to
An operation portion 63e at the right end of 3d is formed.

A rotation link 66 is fixed to the output shaft 62 of the actuator 61 at the upper end thereof, and a roller 67 pivotally attached to the lower end of the rotation link 66 is formed by a notch engagement portion of the input arm 63c. 68. When the actuator 61 is turned on, the rotation link 66 is driven to rotate in the direction of arrow B in FIG.
Is turned off, the rotation link 66 is
1 is elastically urged in the direction of arrow A in FIG.

In the state where the actuator 61 is turned off, the lever member 63 moves as shown in FIG.
The lower moving position which has been rotated downward is held, and in this lower moving position, the lever portion 63b of the lever member 63 is
5 is in contact with the lower side of the pin member 69 protruding from the fifth member.
When the actuator 61 is switched to ON, the rotation link 66 rotates in the direction of arrow B, so that the lever member 63 is turned on.
Is switched to the upper position where the holding shaft 41 is rotated upward as shown in FIG. 6, and the holding shaft holder 45 of the holding shaft 41 is pushed upward by a predetermined stroke by the lever portion 63b.
Is switched to the retracted position against the elastic force of the spring 47 and held at the retracted position. By holding the actuator 61 ON as described above, the presser shaft 41 can be held at the retracted position. However, as a measure to reduce the heat load of the actuator 61 and save power, and as a countermeasure when the power supply is suddenly shut off, a lever A lock device 70 is provided for locking the 63 at the retracted position so as to be unlockable.

Next, the lock device 70 will be described. As shown in FIGS. 8 and 9, the lock device 70 is provided with a case 71 fixed to a bracket 64 that fixedly supports the actuator 61, and is provided in the case 71 so as to be movable back and forth by a small stroke, and has advanced forward. A lock member 72 that can be switched between a lock position and a retracted unlock position, a spring 73 that elastically biases the lock member 72 forward (toward the lock position),
Small solenoid type actuator 74 for driving the lock member 72 rearward (toward the unlocked position) against the lock 3
(This corresponds to a driving body).

The bracket 64 for fixing the actuator 61 is provided with a front wall 64a, a bottom wall 64b, and an upright wall 64c extending downward from the left end of the bottom wall 64b. The case 71 is provided with an upright wall 71a fixed to the upright wall 64c, a bottom wall 71b extending leftward from the lower end of the upright wall 71a, and a rear wall 71c rising from the rear end of the bottom wall 71b. , And on the bottom wall 71b,
A U-shaped member 75 having a U-shape in side view for fixing the actuator 61 is fixed. The lock member 72 is positioned between the front end wall of the U-shaped member 75 and the upright wall portion 71a, the position in the left-right direction is regulated, and the lock member 72 is fixed to the upright wall portion 71a.
A pair of screws 77 are inserted into a pair of front-rear direction slits 78 formed in the lock member 72 to lock the lock member 7.
2 is restricted, and the lock member 72 is restricted from moving in the left-right direction from the left side by the heads of the pair of screws 77.

The lock member 72 includes a vertical wall-shaped main body 72a, a spring receiving portion 72b bent leftward from a rear end thereof, and a lock portion 72c formed at a front end of the main body 72a. And the vertical wall 7 from the middle of the main body 72a.
A manual operation unit 72d is provided, which is inserted through the slit 76a and protrudes rightward. In the U-shaped member 75, an actuator 74 is disposed
The output shaft 7 of the actuator 74 is fixed to the shape member 75.
4a is inserted through the insertion hole of the spring receiving portion 72b, and is fixed to the spring receiving portion 72b with a pair of nuts 79. A compression spring 73 is mounted between a rear wall portion 71c of the case 71 and a spring receiving portion 72b of the lock member 72. The spring 73 is connected to an output shaft 74a of an actuator 74.
It is provided in an exterior shape.

As described above, the lock member 72 is elastically urged forward by the spring 73, and when the lever member 63 is at the downward movement position, the lock portion 72 of the lock member 72 is locked.
c is held in contact with the rear surface of the operation arm 63d of the lever member 63, and when the lever 63 is switched to the upper movement position and the operation arm 63b swings downward, the lock member 72 is locked.
Is configured to advance forward by the biasing force of the spring 73, to the upper side of the operation arm 63b, and to lock the upper surface of the operation arm 63b, thereby locking the lever member 63 to the retracted position.

As described above, in a state where the lock member 72 of the lock device 70 is held at the lock position and the lever member 63 is held at the upward movement position, the actuator 74 is switched ON and the output shaft 74a is advanced backward. When driving,
The lock member 72 is driven to move rearward, and the lock portion 72c
Is displaced rearward from the rear surface of the operating arm portion 63b of the lever member 63, the lever member 63 has a biasing force of a spring 47 for biasing the pressing shaft 41 downward and a torsion spring built in the actuator 61. The force is switched from the upper movement position to the lower movement position, and the presser shaft 41 and the presser foot 42 are switched from the retracted position to the use position.

Next, the presser shaft assisting mechanism 90 will be described. The presser shaft auxiliary operating mechanism 90 is for forcibly switching the presser shaft 41 to the use position when the needle bar 12 descends from the top dead center to the bottom dead center.
This is provided as a safety mechanism in the event that the presser shaft 41 does not descend to the use position for some reason even in the state where the lock of “0” is released. As shown in FIGS. 5 and 6, an L-shaped passive member 91 is integrally formed on the left side of the holding shaft holder 45 so as to extend downward.
Is formed with a passive portion 91a projecting toward the base needle bar 24 side. The passive member 91 is configured so as not to be buffered by the pressing operation body 46, and as shown in FIG.
When the member 1 is lowered to the use position, the passive member 91 is configured to be located on the left side of the pressing operation body 46.

On the right side of the needle bar holder 26 (which corresponds to an engaging member), a stepped engaging portion 92 is formed to face the passive portion 91a of the passive member 91 from above. . When the presser shaft 41 is switched to the retracted position when the needle bar 12 is at the top dead center, that is, when the needle bar clamp 26 is at the top dead center, as shown in FIG. It is located a predetermined height above the section 91a and faces the passive section 91a from above. On the other hand, in a state where the presser shaft 41 is lowered to the use position, when the needle bar 12 is at the bottom dead center, that is, when the needle bar holder 26 is at the bottom dead center, the engaging portion 92 is connected to the passive portion 91a. It is constituted so that it may approach and may be opposed from above.

Therefore, even when the embroidery sewing is started with the presser shaft 41 not lowered to the use position for some reason after the lock device 70 is unlocked, the needle bar 12, that is, the needle bar clamp 26 is raised. On the way from the dead center to the bottom dead center, the engaging portion 92 engages with the passive portion 91a from above, lowers the passive member 91, and switches the presser shaft 41 to the use position. However, when performing embroidery sewing in a state where the presser shaft 41 is lowered to the use position, FIG.
As shown in FIG. 6 and FIG. 6, the engaging portion 92 does not engage with the passive portion 91a, and in this case, the influence of the auxiliary operating mechanism 90 does not occur at all.

Next, the presser foot switching device 70 described above
The operation of the presser shaft assisting operation mechanism 90 will be supplementarily described. When performing embroidery sewing, the actuator 61 is
The presser shaft 41 is held by F and reciprocates up and down with a movement stroke of about 7 mm in synchronization with the vertical movement of the needle bar 12 by the presser foot driving mechanism 40 in the use position lowered by the urging force of the spring 47. . When the work cloth is changed or the movable frame 16 and the embroidery frame are moved while the embroidery sewing is stopped, the actuator 6
When 1 is switched to ON, the lever member 63 is switched to the upper movement position, and the lever member 63 is switched to the retracted position where the pressing shaft 41 is retracted upward.

By switching the lever member 63 to the upper position, the lock member 72 of the lock device 70 is automatically switched to the lock position, the lever member 63 is held at the upper position, and the presser shaft 41 and the presser foot are held. 42 is held at the retracted position. Therefore, if necessary, the actuator 61 is turned off.
, Or even if the power is turned off due to a power failure or the like, the locking device 70 holds the lever member 63 at the upward movement position, and holds the presser shaft 41 and the presser foot 42 at the retracted position.

On the other hand, when the actuator 61 is out of order, or when it is desired to temporarily switch the presser foot 42 to the retracted position without the intervention of the actuator 61, the manual operation section 63e of the lever member 63 is operated as required. When manually pushed downward, the lever member 63 is pushed by the manual operation force.
Can be switched to the upward movement position, and the presser shaft 41 and the presser foot 42 can be switched to the retracted position. Then, as described above, the lever member 63 is held at the upward movement position by the lock device 70, and the presser shaft 41 and the presser foot 42 are held at the retracted position.

Next, when the embroidery sewing is started, when the actuator 74 is switched to ON, the lock member 72 of the lock device 70 moves to the unlock position, and the lever member 6 is turned on.
3 moves to the lower position, and the presser shaft 41 and the presser foot 42 move down to the use position. However, the actuator 74 need only be temporarily turned on. Further, when the actuator 74 is broken at the time of unlocking, if the lock member 7
When manually moving the second manual operation unit 72d backward,
The lock member 72 moves to the unlock position, the lever member 63 is switched to the lower position, and the presser shaft 41 and the presser foot 42 are moved.
Moves down to the use position.

As described above, when the lock member 72 of the lock device 70 is switched to the unlocked position, the spring 47
The presser shaft holder 45 is driven downward by the urging force, so that the presser shaft 41 and the presser foot 42 are switched to the use position. However, due to poor lubrication of the presser shaft 41 and the influence of dust and the like, the lock member 7
Even if the presser shaft 41 is not switched to the use position even if the presser shaft 2 is switched to the lock release position, the presser shaft 41 can be surely switched to the use position by the presser shaft auxiliary operating mechanism 90. The sewing needle 8 and the thread hook at the lower end of 12 do not collide with the presser foot 42 and are not damaged.

Here, a modified example in which a part of the above embodiment is changed will be described. 1) The driven member 91 of the presser shaft assisting operation mechanism 90 may be formed as a separate member from the presser shaft holder 45 and fixed to the presser shaft holder 45 or the presser shaft 41. 2] An embroidery sewing machine configured to switch the presser foot by another presser foot switching device instead of the presser foot switching device 60 can be used.
The presser shaft assisting operation mechanism 90 is applicable. 3) In the presser foot switching device 60, a small electric motor with a reduction gear can be used instead of the actuator 61, and an air cylinder or the like can be used. 4] As shown in FIG. 10, the presser foot assisting mechanism is operated even in a state where the presser shaft 41 and the presser foot 42 are switched to the use position in which they are lowered. However, in this case, the dimension A from the bottom dead center of the engaging portion 92 to the bottom dead center of the passive portion 91a is from the bottom dead center of the thread hook 12a to the upper surface of the needle plate (the lowest level of the lower end ring portion of the presser foot). Dimension B up to
The engaging portion 92 is configured to be smaller and the bottom dead center of the engaging portion 92 falls within the vertical reciprocating range of the passive portion 91a. 5] The present invention is also applicable to an embroidery sewing machine in which the needle bar is directly driven up and down by a needle bar crank without passing through the base needle bar 24. 6] The needle bar case 7 may have a configuration in which a plurality of needle bars 12 are arranged in an arc shape and pivotally supported at the front end of the arm 3.

[0034]

As described above, according to the presser foot mechanism of the embroidery sewing machine of the first aspect, the presser shaft assisting operation mechanism including the passive member and the engaging member is provided. When the lifting member, that is, the needle bar is lowered from the top dead center, the presser shaft can be lowered from above to the use position. That is, even if embroidery sewing is started in a state where the presser shaft does not lower to the use position for some reason, when the needle bar lowers from the top dead center, the presser shaft always lowers to the use position. It is possible to reliably prevent the thread hook from colliding with the presser shaft and being damaged. In addition, the presser shaft assisting mechanism has a simple configuration including a passive member and an engaging member, and has a small number of parts, is small, and is inexpensive to manufacture.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of a multi-head embroidery machine provided with three embroidery sewing machines according to an embodiment.

FIG. 2 is a schematic plan view of the multi-head embroidery machine of FIG.

FIG. 3 is a vertical sectional side view showing a needle bar driving mechanism of the embroidery sewing machine of FIG. 1;

FIG. 4 is a vertical sectional side view showing a presser foot drive mechanism of the embroidery sewing machine of FIG. 1;

5 is a front view of the sewing machine head showing a presser foot switching device, a presser shaft assisting operation mechanism, and the like in a state where the presser foot of the embroidery sewing machine of FIG. 1 is in a use position.

6 is a front view of the sewing machine head showing a presser foot switching device, a presser shaft assisting operation mechanism, and the like in a state where the presser foot of the embroidery sewing machine of FIG. 1 is in a retracted position.

FIG. 7 is a plan view of a main part of a sewing machine head showing a presser foot switching device and the like of the embroidery sewing machine of FIG. 1;

FIG. 8 is a side view of the presser foot switching device of the embroidery sewing machine of FIG. 1;

FIG. 9 is a schematic perspective view of a presser foot switching device of the embroidery sewing machine of FIG. 1;

FIG. 10 is a partial view corresponding to FIG. 5 according to a modification.

[Explanation of symbols]

 MH1 to MH3: multi-needle embroidery sewing machine 26: needle bar holding (corresponding to an engaging member) 41: presser shaft 42: presser foot 90: presser shaft auxiliary operating mechanism 91: passive member 91a: passive portion 92: engaging portion

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (1)

(57) [Claims] 1. A presser shaft having a presser foot fixed to a lower end portion, supported by a machine frame so as to be able to move up and down, and configured to be switchable between a retracted position retracted upward and a use position not retracted. An embroidery sewing machine comprising: a presser shaft; a needle bar supporting a needle at a lower end thereof; and an elevating member supporting the needle bar, the elevating member being supported on the machine frame so as to be able to move up and down. A presser shaft assisting mechanism, comprising: a passive member fixed to a portion and having a passive portion; and an engaging member having an engaging portion capable of moving up and down integrally with the elevating member and facing the passive portion of the passive member from above. A presser shaft assisting mechanism configured to lower the presser shaft from above to a use position when the elevating member lowers from top dead center through the engagement between the engaging portion and the passive portion. An embroidery sewing machine presser foot mechanism characterized by being provided .