JPH08336685A - Knee lifter device of sewing machine - Google Patents

Abstract

PURPOSE: To enhance the operability of replacing cloth by providing a knee litter mechanism which is operated by a knee lifter lever operated by the knee. CONSTITUTION: To replace cloth, a knee lifter lever 52 is attached to the knee lifter shaft of a knee lifter mechanism 35. The knee lifter lever 52 is pressed by the knee to operate the knee lifter mechanism 35. Then a knee litter shaft arm 54 is rotated counterclockwise, and an adjusting screw (r) rotates an adjusting arm 53 counterclockwise. The counterclockwise rotation of the adjusting arm 53 causes a connecting arm 59, an intermediate link 45, a connecting arm 58, and an intermediate link 43 to rotate and causes a connecting arm 57 to move to the right. This rightward movement of the connecting arm 57 causes a presser foot lift mechanism 20 to operate. By the operation of the presser foot lift mechanism 20, a presser foot 13 is raised to a position exceeding the height of an embroidery frame. When the operation of the knee lifter lever 52 is stopped, each part is moved in the opposite direction and an embroidery presser foot 13 is lowered.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knee raising device for a sewing machine having an embroidering function.

[0002]

2. Description of the Related Art In recent years, at home, for example, a sewing machine is used to sew a plurality of sewing pieces together to perform patchwork sewing, and the patchwork work produced by this patchwork sewing is further quilted with an embroidery sewing machine. The number of people who make quilts is increasing.

In the process of manufacturing the patchwork quilt, a quilting part Q is applied to the patchwork work 8 by using a sewing machine having an embroidery sewing function as shown in FIG.
In many cases, the embroidery frame 7 is applied to a large area beyond the sewable range, and the embroidery frame 7 needs to be refilled with the cloth 8 (patchwork work) many times. Furthermore,
At the time of re-clothing of the embroidery frame 7, the embroidery presser 13 is lifted to a position exceeding the height of the frame of the embroidery frame or the cloth is realigned or the pattern of the quilting portion is aligned. It is necessary to frequently perform work such as lowering to the position 8.

To reattach the cloth 8 to the hoop 7, it is necessary to use both hands for the operation.
However, in the conventional household embroidery sewing machine, in order to raise the embroidery presser 13 to a position exceeding the height of the frame of the embroidery frame, the presser foot is lifted beyond the normal upper control position which is one stable position of the presser foot. Rotate to the open position,
It had to be held with one hand, and both hands could not be used when the cloth was reattached to the hoop, resulting in extremely poor workability.

[0005]

A first problem to be solved by the present invention is to embroider an embroidery presser attached to a presser bar mechanism which has an embroidery sewing function and constantly urges the presser bar downward. In a sewing machine equipped with a presser up-and-down mechanism that moves up and down in synchronization with the upper shaft rotation of the sewing machine when sewing, in order to raise the embroidery presser to a position exceeding the frame height of the hoop as necessary when the sewing machine is stopped. , A knee lift mechanism that can be operated by a knee lift lever that is operated by the knee is provided as an operating mechanism of a separate system that does not require the conventional holding operation of the presser foot, so that both hands can be freely changed when changing the cloth to the hoop. To make it usable and to greatly improve workability such as re-clothing.

Secondly, in the sewing machine, when the sewing machine is stopped, the knee raising mechanism is provided for operating the knee raising lever as necessary to raise the embroidery presser to a position exceeding the frame height of the embroidery frame. As a result, the operation of the work clamp vertical movement mechanism during embroidery sewing is not hindered, and the movement of the knee raising mechanism that is operated by the knee raising lever when the sewing machine is stopped is transmitted to the work clamp vertical movement mechanism side without waste, and the stitching work is efficiently performed. This is to be able to raise it to a position beyond the frame height of the hoop.

[0007]

In order to solve the above-mentioned problems of the prior art, the present invention has an embroidering function,
A sewing machine equipped with a presser up-and-down moving mechanism for vertically moving the embroidery presser attached to a presser bar mechanism that constantly urges the presser bar downwards in synchronization with the upper shaft rotation of the sewing machine during sewing. A knee-raising mechanism configured to raise the embroidery presser attached to the presser bar to a position exceeding the height of the frame of the embroidery frame when the presser bar is actuated.
A knee lifting device for a sewing machine, which is connected to the knee lifting mechanism and includes a knee lifting lever that operates the knee lifting mechanism by operating the knee when the sewing machine is stopped.

Further, in order to solve the above-mentioned problems of the prior art, the present invention provides, in the knee raising device of the sewing machine, in the vicinity of a connecting portion of the knee raising mechanism with the presser vertical movement mechanism,
A transmission mechanism section with a relief that exceeds the control movement range on the presser foot vertical movement mechanism side when embroidering is arranged, and the control movement on the presser foot vertical movement mechanism side during embroidering is not transmitted to the knee lift mechanism side. A knee lifting device for a sewing machine, in which only the control motion on the knee lifting mechanism side by the knee operation of the knee lifting lever when the sewing machine is stopped is transmitted to the presser vertical movement mechanism side.

Further, in order to solve the above-mentioned problems of the prior art, the present invention is such that, in the knee raising device for the sewing machine, an adjusting mechanism for the transmission mechanism is provided on the knee raising mechanism side, and the knee raising mechanism is used by the adjusting mechanism. A knee lifting device for a sewing machine, in which a transmission start position of a control motion from a mechanism side to a presser vertical movement mechanism side can be adjusted.

[0010]

According to the present invention, firstly, the embroidery presser attached to the presser bar mechanism which has the embroidery sewing function and always urges the presser bar downward is adapted to rotate the upper shaft of the sewing machine at the time of embroidering. In a sewing machine equipped with a work clamp vertical movement mechanism that moves up and down in synchronization, when the sewing machine is stopped, it is necessary to raise the embroidery presser to a position exceeding the frame height of the embroidery frame by using the conventional presser foot lifting mechanism. A knee lift mechanism that can be operated by a knee lift lever that is operated by the knee as a separate mechanism that does not require a holding operation is provided, so both hands can be used freely when changing the cloth to the embroidery frame. The workability of can be greatly improved.

Secondly, in the above-mentioned sewing machine, a knee-raising mechanism provided for raising the embroidery presser to a position exceeding the frame height of the embroidery frame by operating the knee-raising lever as required when the sewing machine is stopped. As a result, the operation of the work clamp vertical movement mechanism during embroidery sewing is not hindered, and the movement of the knee raising mechanism that is operated by the knee raising lever when the sewing machine is stopped is transmitted to the work clamp vertical movement mechanism side without waste, and the stitching work is efficiently performed. It can be raised to a position beyond the frame height of the hoop.

[0012]

【Example】

(1) Schematic Configuration of Sewing Machine Hereinafter, the present invention will be described based on embodiments with reference to the drawings. FIG. 1 is a perspective view of an embroidery sewing machine (hereinafter, sewing machine) according to the present invention. A display device 4 is provided on a front cover 3 of the sewing machine 1. The display device 4 includes a liquid crystal display unit and a transparent touch panel arranged on the front surface thereof, and displays various screen keys in addition to various displays related to sewing.

A needle bar 5 capable of reciprocating vertically in the machine frame of the sewing machine.
And a hoop driving mechanism (not shown) is provided in the base 6 of the sewing machine 1, and the hoop 7 (FIG. 7) can be attached to the carriage 9 at the output end of the hoop driving mechanism. ing. An embroidery presser 13 is detachably attached near the lower end of the presser bar 12.

The knee raising lever 52 includes an operating portion 52a operated by the knee, a distal end portion 52b and a pair of overhanging portions 52c are formed, and the knee raising shaft 5 disposed on the base 6 is provided.
A pair of overhanging portions 52c of the knee-raising lever 52 are provided at one end.
There is formed a pair of slits p that engage with.

(2) Pressing mechanism Next, the pressing bar mechanism of the sewing machine will be described mainly with reference to FIG. The presser bar 12 of the presser bar mechanism 10 is vertically movably guided by the sewing machine body 2, and an embroidery presser 13 (hereinafter, presser 13) can be attached near the lower end thereof. A presser bar hanger 14 is fixed by a set screw 15 near the middle of the presser bar 12, and the presser bar 12 and the presser spring 16 are provided.
And it is always urged downward in FIG. 2 via the presser bar holder 14.

(3) Presser Vertical Movement Mechanism Next, the presser vertical movement mechanism of the sewing machine will be described mainly with reference to FIGS. 2 to 4. This work clamp vertical movement mechanism 20
Presser foot 13 in synchronization with the upper shaft of the sewing machine when sewing
It is a mechanism that automatically moves up and down by the amount required for embroidering.

The presser actuating arm 21 has a substantially U-shaped shape in the longitudinal direction, has arm portions formed at both ends thereof, a pin a is attached to one end arm portion, and the other end arm portion is provided. Contact member 2 with pin b attached and contact surface u formed
2 are installed. The presser foot operating arm 21 has an operating shaft 2
3 is rotatably supported, and the operating shaft 23 is fixed to the sewing machine main body 2 and the base plate 24.

A long groove 25a is formed near the upper part of the link 25, and a pin a is inserted into the long groove 25a.
The vicinity of the lower end of is attached to the presser bar hanger 14 by a step screw 26 so as to be rotatable. The torsion coil spring 27 urges the presser working arm 21 in the counterclockwise direction around the working arm in FIG. 3, but the pressing spring 16 (FIG. 2) does not work.
The force is set to be weaker than the clockwise biasing force.

Therefore, when the presser foot 13 is floating from the needle plate 31, the presser foot actuating arm 21 is biased clockwise by the presser foot spring 16 in FIG.
Is abutted on the actuating cam 29. This operating cam 29
Is fixed to the upper shaft 30, and when the upper shaft 30 rotates,
The presser foot 13 is a contact surface u, a presser working arm 21, a pin a, a link 25, a step screw 26 and a needle bar holder 14 and the presser bar 12 automatically moves up and down in accordance with the shape of the operating cam 29 together with the presser foot 13. To do.

As a result, the presser foot 13 moves in synchronization with the rotation of the upper shaft 30 of the sewing machine to move the embroidery frame at the time of embroidering and move up and down as necessary to form a stitch. The above-mentioned series of mechanisms constitutes the work clamp vertical movement mechanism 20.

(4) Knee Lifting Mechanism Next, regarding the knee lifting mechanism 35 of the sewing machine, mainly with reference to FIG.
This will be described with reference to FIGS. 4 and 6. In FIG. 4, the knee raising arm 36 is rotatably supported around a step screw 37, and pins c and d are attached to the two arm portions, respectively. The torsion coil spring 38 is used for the knee raising arm 36.
Is urged counterclockwise.

The connecting link 39 is formed with a hole e and an elongated hole f (FIG. 6) which are axially displaced from each other by 90 degrees, and the pin c of the knee raising arm 36 is inserted into the hole e and the elongated hole f is inserted into the elongated hole f. Work clamp operating arm 21
Pin b is inserted. The slot f of this connecting link 39
And a gap x is formed between the pin b of the presser working arm 21 that is inserted through the gap, and the transmission hole 40 and the pin b form a transmission mechanism section 40.

As will be described later, the transmission mechanism section 40 transmits the control movement from the knee raising mechanism side to the presser up-and-down moving mechanism 20 side. However, when the embroidery stitches, the presser-up and down moving mechanism 20 swings the presser working arm 21. It is configured so that the dynamic motion is not transmitted to the knee raising mechanism 35 side.

In this embodiment, the transmission mechanism portion 40 is arranged near the connecting portion of the knee raising mechanism 35 to the presser foot vertical movement mechanism 20. The main reason is that if the movement of the presser foot vertical movement mechanism 20 side is transmitted to the knee raising mechanism 35 side during stitching, the presser foot vertical movement mechanism 20 causes friction and inertia on the knee raising mechanism 35 side, which are originally unnecessary. This is to prevent the load mechanism from being driven.

Next, the knee raising mechanism 35 will be described focusing on 2, and the first intermediate link 43 is rotatably supported by the pin 44. The L-shaped arm has a pin g at one end and a pin h at the other end. Is attached. The second intermediate link 45 is rotatably supported by a pin 46, and pins i and j are attached to both ends of the link. The third intermediate link 47 is rotatably supported by a pin 48, a pin k is attached to one arm, and a contact surface m is formed on the other arm.

The base 6 is screwed below the sewing machine main body 2, and as shown in FIG. 5, a knee raising shaft 51 is rotatably supported on the base 6. A hole n into which the knee raising lever 52 can be inserted and a pair of slits p are formed at one end of the knee raising shaft 51.

The lower part of the adjusting arm 53 is the knee raising shaft 51.
Is rotatably supported by a pin q mounted above. The knee-raising shaft arm 54 has a substantially L-shape and the adjustment arm 53.
The knee-raising shaft 51 is inserted into the hole of the knee-raising shaft 51, and is fixed by the screw 55. Knee-up axis arm 54
An adjusting screw r is formed on one arm and a stopper s is formed on the other arm.

As described above, the long hole f of the connecting link 39
And the pin b of the presser working arm 21 inserted through the gap x is formed, and the elongated hole f and the pin b constitute the transmission mechanism section 40. By the turning operation, the gap x of the transmission mechanism 40 is adjusted to be the minimum gap when the presser bar moving mechanism 20 lowers the presser bar mechanism 10 as described later.

The torsion coil spring 56 urges the adjusting arm 53 in the clockwise direction around the knee raising shaft 51 in FIG. 1 so that the adjusting arm 53 is attached to the tip of the adjusting screw r provided on the knee raising shaft arm 54. The stoppers s of the other arm of the knee raising shaft arm 54 are urged so as to abut against the base 6.

The connecting arms 57, 58 and 59 connect the pins d and g, the pins h and i, and the pins j and k, respectively. The above series of mechanisms constitutes the knee raising mechanism 35.

(5) Transmission Mechanism Section and Adjustment Mechanism Thereof Next, the transmission mechanism section 40 and its adjustment mechanism 60 will be described with reference to FIGS. 6 and 7. 6A,
(B) is the presser foot operating arm 21 and the link 39 for embroidering
Shows the relationship with. The width of the elongated hole f of the link 39 is formed to be larger than the swinging motion range of the pin a of the presser working arm 21, so that the swinging motion of the pin a is not transmitted to the knee raising mechanism 20 side during embroidering. ing. These links 3
The elongated hole f of 9 and the pin a of the presser actuating arm 21 constitute a transmission mechanism section 40.

FIG. 7 shows the operation of the knee raising lever 52 inserted in the knee raising shaft 51 to operate the knee raising mechanism 35 and the presser up-and-down moving mechanism 2.
It shows a state in which the presser foot 13 is raised through 0 to exceed the heights of the hoop 7 and the inner frame 7 '.

FIG. 6A shows a state in which the presser foot 13 is lowered by the cam 29 during embroidering. In FIG. 6A, a gap x between the left end face of the elongated hole f of the link 39 and the pin b is larger than necessary. If it becomes too large, the amount of lifting of the presser foot 13 by the operation of the knee raising lever 52 cannot be made large, and the presser foot will tend not to exceed the height of the frame of the hoop 7, which is not preferable for the purpose of relining the cloth to the hoop. Will result.

On the other hand, if the swinging operation amount of the knee raising lever 52 is increased in order to solve this problem, the workability and the usability will be unfavorable. Therefore, FIG.
The left end face of the elongated hole f of the link 39 and the pin b in (A)
The clearance x between and must be a minimum clearance such that the left end surface of the slot f does not interfere with the swing motion of the pin b by the presser vertical movement mechanism 20.

In this embodiment, when the gap x is larger than necessary, the adjusting screw r of the knee raising shaft arm 54 constituting the adjusting mechanism 60 is tightened (protruded), and when it interferes, the adjusting screw r is adjusted. By loosening, the gap x can be adjusted to an optimum state. The adjusting mechanism 60 can be provided at any position in the knee raising mechanism 35 where the adjusting operation is easy.

(6) Operation of the knee-raising mechanism The knee-raising mechanism 3 is used when the embroidery frame 8 is replaced with cloth.
To operate 5, the knee raising lever 52 is attached to the knee raising shaft 51 of the knee raising mechanism 35 in advance. In this state, the tip portion 52a of the knee raising lever 52 is fitted into the hole n of the knee raising shaft 51, the pair of projecting portions 52b engages with the pair of slits p of the knee raising shaft 51, and the knee raising lever 52 is operated. With this, the knee raising shaft 51 can be rotated.

Operation portion 52c of the knee raising lever 52 (FIG. 1)
2 is pushed to the right in FIG. 2 by the knee operation, the knee raising mechanism 35
Is operated, the presser foot 13 is lifted to a position exceeding the height of the hoop 7 by the presser lifting mechanism 20 as shown in FIG.

The transmission of the operation will be briefly described below. In FIG. 2, the operating portion 52c of the knee raising lever 52
When (FIG. 1) is pushed to the right by the knee operation, the knee raising shaft 51 rotates counterclockwise in FIG. 2, and the adjusting screw r of the knee raising shaft arm 54 moves the adjusting arm 53 to the knee raising shaft 51. Rotate counterclockwise around the center.

In FIG. 2, when the adjusting arm 53 rotates counterclockwise, the pin q moves the third intermediate link 47 to the pin 48.
Is rotated clockwise about the second arm through the connecting arm 59.
The intermediate link 45 of the first intermediate link 43 rotates counterclockwise around the pin 46, and the first intermediate link 43 moves the pin 4 through the connecting arm 58.
It rotates counterclockwise via 4 to move the connecting arm 57 to the right in FIG.

When the connecting arm 57 moves to the right in FIG. 2, the knee raising arm 36 rotates clockwise around the step screw 37 against the biasing force of the torsion coil spring 38 in FIG. The pin c of the arm 36 moves the connecting link 39 through the hole e thereof to the upper side in FIG.

When the connecting link 39 is moved upward in FIG. 4, the left end face of the elongated hole f of the connecting link is pushed through the pin b of the holding operating arm 21 in FIG.
Is rotated clockwise about the operating shaft 23, the link 25 is raised via the pin b of the presser operating arm 21, and the presser bar 12 is moved via the step screw 26, the presser bar hanger 14 and the set screw 15. , Is raised against the biasing force of the presser spring 16, and the embroidery presser 13 is moved to the embroidery frame 7 as shown in FIG.
It can be raised to a position that exceeds the height of the frame.

In order to lower the embroidery presser 13, when the pushing force to the right in FIG. 2 by the knee operation of the operating portion 52a of the knee raising lever 52 is released, the knee raising mechanism 35 is urged by the torsion coil spring 56. After returning to the state before the operation, the contact surface u of the presser vertical movement mechanism 20 is brought into contact with the operation cam 29, and the state shown in FIG. 6B is obtained. In order to change the state shown in FIG. 6B to the state shown in FIG. 6A, the pulley (not shown) of the sewing machine is rotated about 1/2 turn,
The state of (A) is reached, and the embroidery presser 13 descends.

[0043]

As described above, according to the present invention, firstly, the embroidery presser attached to the presser bar mechanism which has the embroidery sewing function and constantly urges the presser bar downward is used for sewing the sewing machine at the time of sewing. In a sewing machine equipped with a presser up-and-down mechanism that moves up and down in synchronization with the rotation of the upper shaft, the conventional presser foot is used to raise the embroidery presser to a position that exceeds the frame height of the hoop as necessary when the sewing machine is stopped. Since a knee lift mechanism that is operated by the knee lift lever that is operated by the knee is provided as an operating mechanism of another system that does not require holding operation by the raising hand, both hands can be used freely when re-clothing the embroidery frame, etc. It is possible to greatly improve workability such as changing the cloth.

Secondly, in the above-mentioned sewing machine, a knee-raising mechanism provided to operate the knee-raising lever as necessary when the sewing machine is stopped to raise the embroidery presser to a position exceeding the frame height of the embroidery frame. As a result, the operation of the work clamp vertical movement mechanism during embroidery sewing is not hindered, and the movement of the knee raising mechanism that is operated by the knee raising lever when the sewing machine is stopped is transmitted to the work clamp vertical movement mechanism side without waste, and the stitching work is efficiently performed. It can be raised to a position beyond the frame height of the hoop.

[Brief description of drawings]

1 is a perspective view of the external appearance of a sewing machine.

FIG. 2 is a front view showing main parts such as a knee raising device of a sewing machine.

FIG. 3 is a view on arrow A in FIG.

FIG. 4 is a view on arrow B of FIG.

5 is a view on arrow C of FIG.

FIG. 6 is a diagram showing the vertical movement of the presser by the presser vertical movement mechanism.

FIG. 7 is a diagram showing a state where the presser foot is lifted by operating the knee raising device.

FIG. 8 is a perspective view showing a state in which the cloth is quilted.

[Explanation of symbols]

 1 Sewing machine 7 Embroidery frame 10 Presser bar mechanism 12 Presser bar 13 Embroidery presser 20 Presser vertical movement mechanism 30 Upper shaft 35 Knee lift mechanism 40 Transmission mechanism section 52 Knee lift lever 60 Adjustment mechanism

Claims (3)

[Claims] 1. A presser up-and-down movement which has an embroidery sewing function and moves up and down in synchronization with the upper shaft rotation of a sewing machine at the time of embroidering, when an embroidery presser attached to a presser bar mechanism for constantly urging the presser bar downward. In a sewing machine equipped with a mechanism, the embroidery presser attached to the presser bar when it is connected to the presser up-and-down moving mechanism and composed of a plurality of links, connecting arms, springs, etc., exceeds the height of the hoop frame. A knee raising device for a sewing machine, comprising: a knee raising mechanism that raises the knee raising mechanism to a raised position; and a knee raising lever that is connected to the knee raising mechanism and that operates the knee raising mechanism by operating the knee when the sewing machine is stopped. 2. A transmission mechanism portion having a relief portion exceeding a control movement range of the presser vertical movement mechanism side at the time of embroidering is provided near a connection portion with the presser vertical movement mechanism in the knee raising mechanism. , The control motion of the work clamp vertical movement mechanism side during embroidering is not transmitted to the knee lift mechanism side, but only the control motion of the knee lift mechanism side by knee operation of the knee lift lever when the sewing machine is stopped is transmitted to the work clamp vertical movement mechanism side. The method according to claim 1, wherein
The knee-raising device of the sewing machine described in. 3. An adjusting mechanism for a transmission mechanism is disposed on the knee raising mechanism side, and the transmission start position of control motion from the knee raising mechanism side to the presser up-and-down moving mechanism side can be adjusted by the adjusting mechanism. The knee raising device for a sewing machine according to claim 2, wherein: