JP2993295B2 - Jump sewing 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 jump sewing mechanism for an embroidery sewing machine.

[0002]

2. Description of the Related Art Conventionally, in an embroidery sewing machine, as shown in FIG. 4, an elevating body for driving a needle bar is provided on a shaft of a base needle bar 40 provided in parallel with a needle bar 41 supporting a needle 39 at a lower end thereof. 42 is assembled so as to be able to slide up and down. And this lifting body 42
Is driven up and down through cranks 45 and 46 interlocked with the rotation of the needle bar drive cam 44 on the sewing machine main shaft 43.

A driving member 47 is mounted on the elevating body 42 so as to rotate about the axis of the base needle bar 40. A pair of upper and lower engaging projections 48 are formed on the driving member 47. A projecting portion 50 of a needle holder 49 fixed to the needle bar 41 is engaged between the engaging projections 48 in the vertical direction in the drawing. Therefore, this needle bar 41
Is reciprocated up and down in conjunction with the elevating body 42 and the driving member 47.

[0004] On the axis of the needle bar 41, a cloth presser body 5 is provided.
1 is slidably mounted up and down. A coil spring 52 is provided between the cloth presser body 51 and the needle bar holder 49 of the needle bar 41. The cloth presser body 51 moves up and down in conjunction with the reciprocating operation of the needle bar 41.
At the time of a jump command, the driving member 47 is rotated around the axis of the base needle bar 40 by a solenoid plunger (not shown) or the like. Accordingly, the driving member 47
Is disengaged from the projection 50 of the needle bar holder 49. Thus, regardless of the elevating and lowering movement of the elevating body 42 and the driving member 47, the vertical movement of the needle bar 41 and the cloth pressing body 51 is stopped at the top dead center, and only the balance 54 is driven. The upper thread 53 is paid out, and the cloth 55 is fed by the operation of the feed mechanism 56 to perform jump sewing.

[0005]

However, in the conventional jump stitch mechanism of the embroidery sewing machine, as shown in FIG. 5, the needle bar 41 and the presser foot 51 are stopped at the top dead center.
When the feed mechanism 56 is operated to feed the cloth 55, the upper thread 53
Is linearly stretched from the needle hole 57 to the cloth 55, the amount of thread to be fed is reduced, and the thread on the cloth 55 side is tightened.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to drive the cloth presser even when the needle bar is stopped at the time of jump stitching, thereby making it possible to perform jump stitching. The purpose is to smooth out the upper thread and maintain the texture of the seam.

[0007]

In order to achieve the above object, an embroidery sewing machine according to the present invention comprises a sewing needle supported by one end of a needle bar and a cloth presser, which are provided with a needle thread supplied through a balance. It is provided with a jump mechanism that feeds a predetermined amount of feed to the sewn object in a state where the needle bar is released from the sewn object and stopped, and the needle bar and the cloth presser body are respectively provided. A drive means for driving up and down independently and a drive means for driving the needle bar so as to bring the needle bar into the stop state at the time of jump sewing, and a driving means for the cloth presser so as to drive the cloth presser up and down. Control means for controlling.

[0008]

In the embroidery sewing machine of the present invention having the above-mentioned structure, only the needle bar is stopped at the time of jump sewing, and the upper thread is fed out by the raising and lowering drive of the cloth presser so that the thread on the cloth side is not tightened. .

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a needle bar 1 for supporting a needle 9 at a lower end thereof
An elevating body 12 for driving the needle bar is vertically slidably mounted on the axis of the base needle bar 10 provided in parallel with 1.
The elevating body 12 is rotated by a needle bar driving cam 14 on a main shaft 13 of the sewing machine, and a crank 15,
It is driven up and down through 16.

A drive member 18 is mounted on the elevating body 12 so as to rotate about the axis of the base needle bar 10. A pair of upper and lower engaging projections 19 are formed on the driving member 18. The needle bar 1 is located between the engagement projections 19.
The protrusion 21 of the needle holder 20 fixed to 1 is engaged in the vertical direction in the drawing. Therefore, this needle bar 11
It is reciprocated up and down in conjunction with the elevating body 12 and the driving member 18.

In addition, the presser foot 23 is provided in parallel with the base needle bar 10.
The rotation of the drive cam 14 on the main shaft 13 of the sewing machine causes the crank 1 to move in conjunction therewith.
5, is driven up and down through the crank 17 and the cloth holder 22 to be driven independently of the needle bar 11.

In the embroidery sewing machine constructed as described above, at the time of a jump command, the driving member 18 is rotated around the axis of the base needle bar 10 by a plunger or the like of a solenoid (not shown). Of the needle bar 11 stops at the top dead center when the engaging projection 19 of the needle bar comes off the projection 21 of the needle bar holder 20.

On the other hand, the presser body 23 is
Is driven up and down through the crank 17 and the cloth holding body holder 22 with the rotation of. As a result, as shown in FIG.
Are stopped at the top dead center, only the balance 54 and the feed mechanism 56 are driven, and the upper thread 53 is stretched linearly from the needle hole 57 to the cloth 55. In the present embodiment, however, FIGS. As shown, while the feed mechanism 27 is ON, the presser foot 23 rises to the top dead center only once, and is always located below the top dead center except for the above case. The payout amount is larger than when the dotted line is stretched linearly. And the upper thread 2
When the feed mechanism 27 operates with the cloth 4 along the cloth 25, the cloth 2
5 is sent and jump sewing is performed. Thereby, jump sewing can be performed without tightening the thread on the cloth side, and the texture of the seam can be maintained.

In the embodiment described above, the sewing machine spindle 13 is used.
Although the needle bar 11 and the presser foot 23 are reciprocally driven in accordance with the rotation of the sewing machine, a driving body such as a motor for driving the presser presser may be provided separately from the main shaft 13 of the sewing machine. Absent.

[0016]

As apparent from the above description, the jump stitching mechanism of the embroidery sewing machine according to the present invention can be used only when the balance is driven by driving the cloth presser even when the needle bar is stopped at the time of a jump command. The upper thread can be paid out more, and the texture of the seam can be maintained without tightening the thread on the cloth side.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of an embroidery sewing machine.

FIG. 2 is a timing chart.

FIG. 3 is an upper thread state diagram.

FIG. 4 is a side view of a main part of a conventional embroidery sewing machine.

FIG. 5 is a conventional upper thread state diagram.

[Explanation of symbols]

 9 Needle 10 Base Needle Bar 11 Needle Bar 12 Elevating Body 13 Sewing Machine Spindle 14 Drive Cam 15, 16, 17 Crank 18 Drive Member 19 Engagement Projection 20 Needle Bar Holder 21 Projection 22 Cloth Holder Holder 23 Cloth Holder 24 Top Thread 25 Cloth 26 Balance 27 Feeding mechanism

Claims (1)

(57) [Claims] 1. A state in which an upper thread supplied through a balance is inserted into a sewing needle supported by one end of a needle bar and a cloth presser body, and the needle bar is separated from a workpiece and stopped. An embroidery sewing machine provided with a jump mechanism for feeding a predetermined amount of feed to the sewn object, a driving unit for individually driving the needle bar and the cloth presser body to move up and down, and the needle bar in the stop state during jump sewing. Control means for controlling the driving means of the needle presser so as to move the needle presser up and down while controlling the driving means of the needle bar so that the needle bar is stopped. A jump stitching mechanism for an embroidery sewing machine, characterized in that the presser body is driven and the upper thread is fed out by the presser body.