JP3292472B2 - 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 sewing machine for performing embroidery sewing by combining an embroidery frame feeder for freely moving an embroidery frame on which a work cloth is mounted.

[0002]

2. Description of the Related Art Conventionally, a sewing machine equipped with an embroidery frame feeding device (for example, Japanese Patent Application Laid-Open No. 2-80084) is provided with a sinking mechanism for sinking a feed dog from a needle plate. The sinking mechanism releases the vertical movement mechanism for vertically moving the feed dog by moving the lever, and causes the feed dog to sink from the needle plate. In a conventional sewing machine, the lever of the lowering mechanism is connected to a switching lever exposed to the outside. The operator operates the external switching lever to lower the feed dog from the needle plate, and then mounts the embroidery frame feeding device on the sewing machine. If the feed dog sinks below the needle plate, the movement of the embroidery frame performed by the embroidery frame feeding device works together with the vertical movement of the sewing needle of the sewing machine without being disturbed by the feed dog, and the desired movement of the work cloth attached to the embroidery frame is achieved. Embroidery is formed.

[0003]

However, the above-mentioned conventional sewing machine has a problem that the operator sometimes forgets to operate the switching lever. If you forget the operation of the switching lever and operate the embroidery frame feeder with the feed dog raised from the needle plate, the feed dog will interfere with the work cloth mounted on the embroidery frame,
Embroidery sewing cannot be performed normally.

[0004] It is an object of the present invention to solve the above-mentioned problems and to eliminate the possibility of erroneous operation of forgetting to settle the feed dog.

[0005]

According to a first aspect of the present invention, there is provided a sewing machine for performing embroidery sewing by combining an embroidery frame feeding device for moving an embroidery frame with a work cloth mounted thereon. The sewing surface of the sewing machine to which the embroidery frame feeding device is combined .
Provided on the lower side, and the action piece that will be moved coalesced attached to I <br/> Ri along with the mounting operation of the embroidery frame feeding device, said working
Lever connected to a piece and linked by the movement of the action piece
When the vertically moving mechanism for vertically moving the feed dog of the sewing machine, before
In accordance with the mounting operation of the embroidery frame feeding device,
Including the lever to be moved, based on the moving power of the lever
Release the feed dog vertical movement of the vertical movement mechanism
A lowering mechanism for lowering the feed dog from the needle plate;
Of the working piece and the sinking mechanism based on the removal of the
When the lever is returned, the feed
Spring means for allowing the downward movement to be returned .

In the above configuration, when the embroidery frame feeding device is combined with the sewing machine, the action piece provided on the combined surface of the sewing machine moves. The movement of the action piece is transmitted to the lever of the sinking mechanism, and moves the lever of the sinking mechanism. By this movement of the lever, the sinking mechanism releases the vertical movement of the feed dog of the vertical movement mechanism and causes the feed dog to sink from the needle plate. That is, if the embroidery frame feeding device is combined and mounted , the feed dog of the sewing machine is automatically lowered. Therefore, the operation of lowering the feed dog becomes unnecessary, and erroneous operation cannot occur. Also, the embroidery frame feeder
From the state of being attached to the
The action piece and the lever of the sinking mechanism are actuated by the action of the spring means.
And the vertical movement of the feed dog of the vertical movement mechanism.
The work can be restored. Further, the sewing machine according to claim 2 is characterized in that
Characterized in that the acting piece and the lever are integrally formed.
I do. Therefore, in this configuration, it is necessary to simplify the configuration.
Can be

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. FIG. 1 shows a state in which the embroidery frame feeding device S is mounted on the free arm 2 of the sewing machine 1. The embroidery frame feeding device S is an embroidery frame S
1 is arranged on the upper surface of the needle plate 3 of the sewing machine 1, and the embroidery frame S1 is
Performs positioning control in the axial direction. The positioning control of the embroidery frame S1 and the vertical movement of the sewing needle 7 attached to the needle bar 5 of the sewing machine 1 work together to form embroidery on the work cloth. An embroidery presser foot 11 is mounted on the presser bar 9 of the sewing machine M in advance.

As a mechanism for lowering the feed dog 25 (FIG. 2) of the sewing machine 1, an operation projection 13 is provided on the lower surface of the free arm 2. The operation projection 13 projects inside a recess 15 provided on the lower surface of the free arm 2 for protection. The embroidery frame feeding device S has an operation piece that moves the operation projection 13 of the sewing machine 1.
All the extruded pieces S3 are provided.

As shown in the perspective view of FIG. 2, the lowering mechanism 20 for the feed dog 25 includes a front-rear feed drive mechanism 21 for feeding the feed tooth 25 of the sewing machine back and forth, and a vertical feed drive mechanism 23 for feeding the feed tooth 25 up and down. Composed around. Prior to the description of the subsidence mechanism 20, first, the outline of the front-rear drive mechanism 21 and the vertical drive mechanism 23 of the feed dog 25 will be described below. 3 is a plan view, FIG. 4 is a front view, and FIG. 5 is a left side view.

The feed dog 25 is fixed on the upper surface of the feed base 27. A forward / backward movement is imparted to the feed table 27 by the forward / backward drive mechanism 21. The forward / reverse feed drive mechanism 21 includes a swing arm 29
And a horizontal feed arm 31. The swing arm 29 is swingably supported by a lower support shaft 33. The swing arm 29 is given a swing motion about the support shaft 33 by a swing drive unit (not shown). A support shaft 35 is supported on the upper part of the swing arm 29, and the support shaft 35 reciprocates in the front-rear direction with the swing of the swing arm 29.

The two bearings 31 at the rear of the horizontal feed arm 31
a and 31b are rotatably supported by the support shaft 35. The horizontal feed arm 31 has a roller 31c at the front end. Roller 31
c is supported by the support surface 37. On the side surface of the horizontal feed arm 31, a tension spring 39 is stretched between the horizontal feed arm 31 and the lower frame. The tension spring 39 urges the horizontal feed arm 31 downward to bring the roller 31c into close contact with the support surface 37. Accordingly, the horizontal feed arm 31 moves back and forth substantially horizontally with the reciprocation of the support shaft 35 in the front and rear direction, and the front and rear feed is given to the feed dog 25 on the feed base 27.

The vertical feed drive mechanism 23 includes the guide rod 4
1, a lower shaft 43, an eccentric cam 45, a vertically moving lever 47, and the like. The guide rod 41 is fixed to the bearing portion 31c of the horizontal feed arm 31 in a state of protruding vertically. The axis of the guide rod 41 and the plate surface of the horizontal feed arm 31 intersect perpendicularly. The upper part of the guide rod 41 penetrates the upper part of the feed base 27, and the lower part of the guide rod 41 penetrates the guide part 27 a extending below the feed base 27. Thus, the feed bar 27
The guide rod 41 is supported movably in the axial direction.

The lower shaft 43 is provided with a timing belt on a pulley, and is rotated in synchronization with the upper shaft for the vertical movement of the sewing needle 7 and the like. The eccentric cam 45 is a cam eccentrically provided on the lower shaft 43. The amount of eccentricity is determined according to the vertical stroke of the feed dog 25. The details of the eccentric cam 45 will be described later.

The vertical movement lever 47 has a rod 49 at the front end.
The lower surface of the abdomen abuts on the eccentric cam 45. A roller 49 is rotatably supported on the side surface at the rear end of the vertical movement lever 47. A support surface 27b provided on the lower surface of the feed base 27 is in sliding contact with the roller 49. Guide 27a of feed base 27 and bearing 31b of horizontal feed arm 31
, A compression spring 51 is disposed between the
Is biased downward.

Therefore, when the lower shaft 43 rotates, the roller 49 of the vertical movement lever 47 moves up and down in accordance with the outer peripheral shape of the eccentric cam 45. As a result, vertical feed is given to the feed dog 25 fixed on the upper part of the feed base 27. Next, the sinking mechanism 20 will be described.

On both sides of the eccentric cam 45 of the vertical feed drive mechanism 23, a flange 45a and a concentric cam 45b are formed integrally. The outer diameter of the concentric cam portion 45b is the same as the minimum diameter of the eccentric cam 45 (the portion where the distance from the center of the lower shaft 43 is the shortest). Therefore, a part 45c is formed between the eccentric cam 45 and the concentric cam part 45b. As shown in FIG. 3, a cutout 45d is formed in the concentric cam 45b in the axial direction of the lower shaft 43. A pin 46 that engages with the notch 45d is attached to the lower shaft 43. With this configuration, the eccentric cam 45 and the flange portions 45 a and the concentric cam portions 45 b on both sides thereof do not rotate with respect to the lower shaft 43, but can slide in the axial direction of the lower shaft 43.

The flange 45a of the eccentric cam 45 and the lower shaft 43
The compression spring 5 as a spring means is provided between the compression spring 5 and the bearing 43a.
3 are interposed. The compression spring 53 urges the eccentric cam 45 toward the vertical movement lever 47 to move the eccentric cam 45 to the vertical movement
7 is located on the lower surface of the abdomen. Les below the compression spring 53
A horizontal rotation lever 55 as a bar is arranged to be swingable in a horizontal direction by a shaft 57. On the lower surface of the end of the horizontal rotation lever 55, the above-described action projection 13 is shown in FIG.
Are provided integrally . The horizontal rotation lever 55
On the upper surface of the other end of the eccentric cam 45, the flange portion 4
An abutment protrusion 59 that abuts on 5a is provided. The horizontal rotation lever 55 includes a tension spring 61 fixed to a frame (not shown).
As a result, the contact protrusion 59 is urged toward the flange portion 45 side. The spring constant of the tension spring 61 is smaller than the spring constant of the compression spring 53.

Next, the operation of the sewing machine having the above configuration will be described. When the upper shaft (not shown) is rotated by the sewing machine motor, the lower shaft 43 rotates in synchronization with the rotation of the upper shaft. Lower shaft 4
By the rotation of 3, the vertical movement lever 47 moves up and down along the outer peripheral shape of the eccentric cam 45, and the feed dog 25 is provided with vertical feed. The feed dog 25 protrudes from the needle plate 3 at the raised position, and moves in a predetermined direction by the operation of the forward / reverse feed drive mechanism 21 to move the needle plate 3
Transfer the work cloth on the surface of. The feed dog 25 sinks below the needle plate 3 at the lowered position, and the front / rear feed drive mechanism 21 operates to return the front / rear position to the position before the transfer of the work cloth.

When the embroidery frame feeder S is mounted on the sewing machine 1, the pushing piece S3 provided on the embroidery frame feeder S pushes out the operation projection 13 of the sewing machine in the direction of arrow A in FIG. . Then, the contact protrusion 59 moves the flange portion 45a against the pressing force of the compression spring 53, and arranges the concentric cam portion 45b below the sub-portion of the vertical movement lever 47. Since the concentric cam portion 45b has the same outer diameter as the minimum diameter of the eccentric cam 45, in this state, even if the lower shaft 43 rotates, the vertical movement lever 47 does not rise. That is, as shown in FIGS. 7 and 8, the feed dog 25 is kept sunk from the needle plate 3.

When the embroidery frame feeder S is mounted on the sewing machine 1, the feed dog 25 is sunk below the needle plate 3. Therefore, the embroidery frame S1 of the embroidery frame feeder S is not disturbed by the feed dog 25. The movement and the vertical movement of the sewing needle 9 of the sewing machine work together to form a desired embroidery on the work cloth mounted on the embroidery frame S1.

When the embroidery frame feeding device S is removed from the sewing machine 1,
The extruded piece S3 separates from the working projection 13. Then, the eccentric cam 45 is biased by the compression spring 53 toward the lower part of the sub-part of the vertical movement lever 47. Since there is a surface 45c between the eccentric cam 45 and the concentric cam portion 45b, when the surface 45c is rotated to the position of the vertical movement lever 47 by the rotation of the lower shaft 43, the eccentric cam 45 is urged. Moves to the lower part of the sub-part of the vertical movement lever 47. Thereafter, the eccentric cam 45 moves the vertical movement lever 47 up and down, and enables the feeding of the work cloth in which the feed dog 25 projects from the needle plate 3.

According to the sewing machine described above, the feed dog 25 is attached to the needle plate 3 only by mounting the embroidery frame feeding device S on the sewing machine.
Since the operation of lowering the feed dog 25 automatically becomes unnecessary, the possibility of erroneous operation can be basically eliminated. Although the embodiment has been described above, the present invention is not limited to the embodiment at all, and it goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention.

[0023]

As described in detail above, claim 1 of the present invention
According to the sewing machine, the embroidery frame feeder is attached to the sewing machine
Then, along with the mounting operation, the sewing machine
The moving working piece moves, and the movement of the working piece
Is transmitted to the bar and the lever of the subsidence mechanism is moved.
The lowering mechanism moves the feed dog up and down due to the movement of the bar.
Release the operation and lower the feed dog from the needle plate.
As a result, when the embroidery frame feeding device is attached to the sewing machine, a configuration in which the feed dog of the sewing machine automatically sinks can be realized, so that a special operation of sinking the feed dog is not required, and an effect that erroneous operation is eliminated is achieved. Also, adjust the embroidery frame feeder.
From the state of being attached to the thin, based on its removal
The working piece and the lever of the lowering mechanism are operated by the spring means.
Therefore, it can be returned and the vertical movement mechanism
The vertical movement of the feed dog can be restored.

According to a second aspect of the present invention, the sewing machine
Since the piece and the lever are integrally configured, this part
Minute configuration can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of a sewing machine according to the present invention.

FIG. 2 is a perspective view showing a feed dog sinking mechanism.

FIG. 3 is a plan view of a settlement mechanism.

FIG. 4 is a front view of a settlement mechanism.

FIG. 5 is a left side view of the settlement mechanism.

FIG. 6 is a plan view of the sinking mechanism in a state where the feed dog is sinking.

FIG. 7 is a front view of the sinking mechanism in a state where the feed dog is sinking.

FIG. 8 is a left side view of the sinking mechanism in a state where the feed dog is sinking.

[Explanation of symbols]

 2 Sewing arm 13 Working projection 25 Feed dog 45 Eccentric cam 45b Concentric cam 47 Vertical movement lever 53 Compression spring 55 Horizontal rotation lever S Embroidery frame feeder S1 Embroidery frame S3 Extruded piece

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-2-80084 (JP, A) JP-A-59-75259 (JP, U) JP-A-55-105078 (JP, U) 21268 (JP, Y1) Jikken Sho 59-35188 (JP, Y1) Jigyo Sho 59-33339 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) D05B 27/24 101

Claims (2)

(57) [Claims] 1. A sewing machine for performing embroidery sewing by combining an embroidery frame feeding device that moves an embroidery frame with a work cloth mounted thereon, wherein the embroidery frame feeding device is provided on a combining surface of the sewing machine to be combined, and The mounting operation by the combined mounting of the frame feeder
A working piece that will be moved along with the vertical movement mechanism for vertically moving the feed dog of the sewing machine, said operating member with the mounting operation of the embroidery frame feed device
The lever includes a lever that is moved by
Release the feed dog vertical movement of the vertical movement mechanism
A sinking mechanism for sinking the feed dog from the needle plate, and the working piece and the working piece based on removal of the embroidery frame feeder.
The lever of the lowering mechanism and the vertical
A spring means for allowing the vertical movement of the feed dog to be restored . (2) The working piece and the lever are integrally formed.
The sewing machine according to claim 1, wherein the sewing machine is formed.