KR20060117225A - Pressing apparatus of sewing machine - Google Patents

Abstract

A pressing device of a sewing machine is provided to perform the combination and secession operations of a presser and an ascending/descending lever with the light power. A pressing arm(10) is installed movably at a bed member of a sewing machine. A pair of pressers(20) are installed movably and interchangeably at the pressing arm. A raising member is hooked with pressers and makes the pressers ascend and descend. A connection member comprises a long hole portion(34a) and a control screw(34b) of a shaft(34c) and is connected with the pressing arm through a raising lever shaft(33). A forward lever(31a) is moved forwardly and backwardly by the sliding movement.

Description

Pressing device of sewing machine {PRESSING APPARATUS OF SEWING MACHINE}

1 is a perspective view showing the overall configuration of a sewing machine in the present embodiment.

2 is an exploded perspective view showing the configuration of main parts of the pressing device of the sewing machine according to the present embodiment.

Figure 3 (a) is a plan view showing the engaging position of the pressing device of the sewing machine according to the present embodiment, Figure 3 (b) is a side view thereof.

Figure 4 (a) is a plan view showing a detachment position of the pressing device of the sewing machine according to the present embodiment, Figure 4 (b) is a side view thereof.

5 is an enlarged perspective view showing the configuration of main parts of the pressing device of the sewing machine according to the present embodiment.

Explanation of symbols on the main parts of the drawings

1: electronic cycle sewing machine 2: sewing machine frame

2a: sewing machine arm part 2b: sewing machine bed part

2c: vertical body portion 3: sewing machine table

4: cloth raising plate 5: sewing needle

10: push arm 11: groove

11a long hole 12 stopping plate

20: presser foot 20a: needle hole

20b: through hole 20c: sliding plate shape

30: lifting means 31: lifting lever

31a: front lever 31b: rear lever

31c: arm member 31d: support plate

32: raising and lowering means 32a: pressing spring

32b: Air cylinder 33: Lift lever shaft

34 connection part 34a long hole part

34b: adjusting screw 100: pressing device

A: Engagement position B: Release position

The present invention relates to a pressing device of a sewing machine having a replaceable presser foot.

Conventionally, in a sewing machine that performs cycle sewing, a presser arm capable of holding the presser foot and moving in the horizontal direction is installed, and a pair of push arm levers to move the presser foot up and down with respect to the presser arm ( Levers) are arranged on both sides of the push arm. Each lever is supported by the push arm so that its center part can be rotatably moved by the horizontal support shaft. The front end of the lever is capable of engaging and disengaging the presser foot. The rear end of the lever is pushed up by the push spring, and the presser foot is normally pushed downward, and the push spring is operated by a driving means such as an air cylinder. The presser foot is raised by lowering the rear end of the lever against the force of action.

The presser foot is detachable with respect to the tip of the presser arm, and a presser for a sewing machine configured to replace the presser foot is known (see Patent Document 1, for example).

[Patent Document 1] Japanese Patent Application Laid-open No. H9-285667

However, in the pressing device of the sewing machine shown in Patent Document 1, a long hole is formed in the lever to penetrate the horizontal support shaft, and the whole push arm lever is moved backward along the long hole to catch the tip portion and the presser foot. Since the presser foot is replaced after releasing the engagement, the load of the press spring always acts on the tip side of the lever, and it is difficult to move the lever backward by light operation when replacing the presser foot, which increases the burden on the operator. Had a problem. In addition, simply moving the lever backward by a long hole exerts an excessive force on the connecting portion of the lever and the actuator, so that there is a problem in that the lever must be configured to allow movement of the lever.

An object of the present invention is to provide a presser for a sewing machine which can easily replace the presser foot.

In order to solve the said subject, invention of Claim 1 is

A press arm for mounting the presser foot at the distal end so as to be movable and exchanged at the same time, and for allowing the base end to be moved horizontally with respect to the sewing machine bed; As a pressing device of a sewing machine having a pair of lifting levers that are capable of engaging or disengaging against each other and having an elastic force that pushes the tip downwards in normal times,

The pair of lifting levers are axially supported so as to be swingable with respect to the pushing arm, and the rear lever is provided with the elastic force, and the back lever is moved forward and backward with respect to the rear lever at the presser foot rather than the point of the swinging motion. It is constituted by a front lever connected to be possible, and at the same time, the pressing device of the sewing machine, characterized in that the front lever is engaged with or separated from the presser foot by moving back and forth.

The invention according to claim 2 is characterized in that, in the pressing device for a sewing machine according to claim 1, the connecting portion is configured by a sliding type by engaging the long hole with the shaft or the convex portion.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described in detail based on drawing about the case where this invention is applied to an electronic cycle sewing machine.

(Overall Configuration of Embodiments)

The pressing device 100 (hereinafter, pressing device 100) of the sewing machine according to the present embodiment is mounted in the electronic cycle sewing machine 1 shown in FIG.

The electronic cycle sewing machine 1 (hereinafter referred to as "sewing machine 1") is provided with a sewing machine frame 2 which has an appearance of approximately "Co" shape, and is placed on the sewing machine table 3. The sewing machine 1, the pressing device 100 to hold the cloth to be sewing material and move relative to the sewing needle 5, the predetermined sewing data (needle stitch pattern) on the cloth held in the pressing device 100 It is a sewing machine for forming a needle stitch based on.

Here, the direction in which the sewing needle 5 performs shanghai movement is set as the Z axis direction (up and down direction), and the longitudinal direction of the sewing machine arm portion perpendicular to this is set as the Y axis direction (front and rear direction), and the Z axis direction and the Y axis The direction orthogonal to both of directions is defined as the X-axis direction (left and right directions).

(Sewing machine frame)

The sewing machine frame 2 includes a sewing machine arm portion 2a extending in the front-rear direction and forming the upper portion of the sewing machine frame 2, and a sewing machine bed portion 2b extending in the front-rear direction and forming a lower portion of the sewing machine frame 2. And a vertical body portion 2c connecting the sewing machine arm portion 2a and the sewing machine bed portion 2b.

In addition, the sewing machine frame 2 is provided with a sewing machine motor, a power transmission mechanism, and various mechanisms for sewing, which are not shown in the drawings.

(Presser)

Next, the pressing device 100 of the sewing machine according to the present embodiment will be described.

The pressing device 100 is a pressing device for deciding a moving position by pressing the cloth to be sewn by the presser foot 20, which will be described later. The pressing arm 10 and the pressing arm 10 that are movable on the sewing machine bed portion 2b. And a pair of presser feet (20, 20) mounted so as to be movable and exchanged at the same time, and elevating means (30) for engaging the presser feet (20, 20) and lifting the presser feet (20, 20). .

The presser arm 10 has its proximal end mounted on the sewing machine bed portion 2b near the front side of the longitudinal body portion 2c, and the distal end thereof is the sewing machine arm portion 2a and the sewing machine bed portion ( It extends between 2b), and the said tip part has the shape which protruded in the vicinity of the sewing needle 5 which moves up and down at the tip side of the sewing machine arm part 2a (refer FIG. 1, FIG. 5). In addition, the bending arm 10 is restrained upward by the receiving plate 31d disposed above the pressing arm 10.

To the proximal end of the push arm 10, a driving means (not shown) disposed in the sewing machine bed portion 2b is connected, and the driving means includes an X-axis pulse motor and a Y-axis pulse motor.

The X-axis pulse motor and the Y-axis pulse motor are configured to impart the driving force along the X-axis direction and the Y-axis direction to the push arm 10 through a gear mechanism, a drive shaft, a guide rail, and the like, which are not shown, respectively. The driving amount and the timing of the driving are controlled by a controller (not shown).

In addition, a cloth lift plate 4 for placing a cloth is connected to the proximal end of the push arm 10. The cloth raising plate 4 extends from the base end of the pressing arm 10 along the upper surface of the sewing machine bed portion 2b over the front of the sewing machine bed portion 2b.

In addition, the lifting lever shaft 33 penetrates the pressing arm 10 in the X-axis direction at an intermediate position in the Y-axis direction of the push arm 10 so as to pivotally support the lifting lever 31 to be described later. This rotational movement is provided.

At the distal end portion (front end) of the push arm 10, support portions of the presser feet 20 and 20 are provided. That is, two grooves 11 and 11 are formed on the entire surface of the support portion along the Y-axis direction (see FIG. 2). Then, the push arm 10, through the presser foot 20 to be mounted in the grooves (11, 11) to move the material to be placed on the sewing machine bed portion (2b) of the support surface from the support surface. It is.

The presser foot (20, 20) is engaged in grooves (11, 11) in which a sliding plate-shaped portion (20c), which is a proximal end thereof, is formed parallel to the tip of the pressing arm (10) in the vertical direction (Z axis direction). It is installed so as to be movable only in the vertical direction, that is, in the Z-axis direction while being kept not to fall forward by the locking plate 12. The upper part and the lower part of the groove parts 11 and 11 are opened, and the sliding plate-shaped parts 20c and 20c of the presser foot 20 and 20 can be taken out from above or below the groove parts 11 and 11, and can be replaced. Equipped to Moreover, two long holes 11a and 11a penetrate in the front-back direction along each groove part 11 and 11 in the back surface of a support part. The leading ends of the two lifting levers 31 and 31 described later with respect to the long holes 11a and 11a are inserted from the rear, respectively, to engage the sliding plate shapes 20c and 20c of each presser foot 20 and 20. To move up and down.

The presser feet 20 and 20 are rectangular sliding plate-shaped parts 20c and 20c in the upper part. The lower end of the presser foot (20, 20) is a 'コ' shape and when the 'コ' shape frame portions (20a, 20a) of the left and right presser feet (20, 20) are aligned to form a rectangular frame.

The presser foot 20, 20 extends obliquely downward at the front side from the sliding plate-shaped portions 20c, 20c of the presser foot 20, 20, and is located at the lowest point of the shank east of the presser foot 20, 20. The fabric is pressed against the fabric on the fabric lift plate 4 from above.

In addition, through-holes 20b and 20b are formed in the sliding plate-shaped portions 20c and 20c of the presser foot 20 and 20 to penetrate the sliding plate-shaped portions 20c and 20c back and forth along the Y-axis direction. have. The elevating levers of the elevating means 30 for driving the presser foot 20, 20 up and down by engaging the through holes 20b, 20b are connected to the through holes 20b, 20b (see Fig. 5). .

The elevating means 30 is axially supported at an approximately central portion of the push arm 10 and at the same time, one end is engaged with or removed from the presser feet 20 and 20 by advancing back and forth, and each presser foot ( 20, 20 to lift and switch the pressed state and the release state, the left and right pair of lifting levers (31, 31) coupled to the presser foot (20, 20) and each lifting lever (31, 31) And elevating operation applying means 32 for imparting a driving force to the vehicle (see FIGS. 1 and 2).

The lifting levers 31 and 31 are arranged at the left and right ends of the push arm 10, and swing in the X axis circumferential direction with the lifting lever shaft 33 provided at a substantially center portion of the push arm 10 as a point. It is possible. Each lifting lever 31, 31 is composed of two different objects, each of the front lever 31a and the rear lever 31b, and each of the front levers 31a, 31a and the rear levers 31b, 31b, The elevating levers 31 and 31 are connected to each other through the connecting portion 34 on the presser foot 20 and 20 side rather than the point of the swinging motion of the elevating levers 31 and 31.

The rear ends of the rear levers 31b and 31b extend on the proximal end of the push arm 10 and are connected to the push springs 32a. In addition, the substantially center portion of the rear levers 31b and 31b is fitted to the lifting lever shaft 33 and is axially supported to be rotatable. The rear levers 31b and 31b are always pushed upward by the push springs 32a at the rear end, and the front end is pushed downward. At the front ends of the rear levers 31b and 31b, i.e., at one end of the front side, two long holes 34a along the substantially Y-axis direction, i.e., the front-rear direction, are formed side by side, respectively. The rear ends of the front levers 31a and 31a are connected to and fixed to the front ends of the rear levers 31b and 31b through shafts and fixing screws inserted into the respective long hole portions 34a and 34a.

In addition, one end (lower end) of the arm members 31c and 31c is fixed to the rear levers 31b and 31b, respectively, and the other ends of the arm members 31c and 31c protrude upward from the rear levers 31b and 31b. It is installed. An air cylinder 32b is provided above the arm members 31c and 31c. The air cylinder 32b is disposed in the sewing machine arm portion 2a. When the movable portion of the air cylinder 32b is driven up and down, the lower portion thereof is in contact with and separated from the upper portions of the arm members 31c and 31c. The rear levers 31b and 31b are driven up and down through the arm members 31c and 31c.

The rear ends of the front levers 31a and 31a are connected to the surface on the push arm 10 side of the rear lever at the front side of the rear levers 31b and 31b, respectively. On the other hand, the front ends of the front levers 31a and 31a are loosely inserted into the through holes 20b and 20b formed by the presser feet 20 and 20 through the long holes 11a and 11a of the support of the push arm 10, respectively. It is.

That is, the front levers 31a and 31a and the rear levers 31b and 31b are on the front side, that is, the presser foot 20, than the lifting lever shaft 33, which is the point of swinging motion of the rear levers 31b and 31b. Is stretched back and forth through the connecting portion 34 in the side.

Specifically, the connecting portion 34 is composed of a long hole (34a) and the adjustment screw (34b) of the shaft (34c) is a sliding type by the engaging engagement of these, pressed through the lifting lever shaft (33). It is connected to the arm 10. And with respect to the rear lever 31b in which the relative back and forth movement with respect to the said push arm 10 is restrict | limited, the front lever 31a is able to advance back and forth by sliding movement (FIG. 3 (a), (b), FIG. 4 (a), (b)).

The connecting portion 34 can move and adjust the front lever 31a back and forth in a state in which the adjusting screw 34b is loosened, and the position thereof can be fixed by fastening the adjusting screw 34b.

In addition, as the adjustment position at the time of moving the front lever 31a back and forth, the "locking engagement position A" (refer FIG. 3) in which the adjustment screw 34b is located in front of the long hole 34a, and the adjustment screw ( There is the "release position B" (refer FIG. 4) which the 34b) makes the back of the long hole 34a, and it can switch them selectively by advancing forward and backward of the said front lever 31a.

That is, in the "locking engagement position A", the front-end | tip of the front lever 31a is inserted in the through-hole 20b of the presser foot 20, and the lifting lever 31 and the presser foot 20 are engaged.

In addition, in the "release position B", the front end of the front lever 31a is separated from the through-hole 20b of the presser foot 20, and the engagement is released. Moreover, the presser foot 20, 20 along the groove part 11, 11 in the state in which the front lever 31a is in the "release position B" and the engaging engagement between the front lever 31a and the presser foot 20 was cancelled | released. Can be taken out from above (or below), and the presser foot 20 can be replaced.

The lifting operation applying means 32 includes a push spring 32a connected to the rear end of the lift lever 31 and an air cylinder 32b as an actuator for driving the lift lever 31 against the pressing force of the push spring 32a. Equipped with.

The pressing spring 32a acts on the rear end of the elevating lever 31 and always presses the rear end of the elevating lever 31 upwards, so that the other end of the elevating lever 31, that is, the end on the front side is always downward. It is pressurized. Accordingly, when the presser foot 20 is engaged with the tip of the lifting lever 31, the presser foot 20 is always pressed downward.

In addition, the air cylinder 32b is driven in accordance with a command from a controller (not shown), and gives the driving force for pressing the rear end of the lifting lever 31 downward against the pressing force of the pressing spring 32a. The presser foot 20 connected to the tip of the lever 31 is pushed upward. In addition, the actuator which drives the lifting lever 31 is not limited to the air cylinder 32b, For example, a pulse motor, a solenoid, etc. can be applied.

Then, the lifting lever 31 is oscillated in the X-axis circumferential direction with the lifting lever shaft 33 as a point according to the driving of the air cylinder 32b, thereby the presser foot engaged with the tip of the lifting lever 31 ( 20 can be lifted up and down along the groove 11.

Next, the operation of the pressing device 100 of the sewing machine according to the present embodiment will be described in detail with reference to the drawings.

First, the case where the front lever 31a of the lifting lever 31 is in the "locking engagement position A" will be described. As described above, the front lever 31a has a hole 34a having a long rear end thereof. It is connected to the rear lever 31b at the front side of the front end, and the front end of the front lever 31a is inserted into the through hole 20b of the presser foot 20.

Here, while the air cylinder 32b is stopped, the pressing force toward upward is always applied to the rear end of the lifting lever 31 (rear lever 31b) by the pressing spring 32a. For this reason, the lifting lever 31 is provided with a pressing force in the counterclockwise direction in FIG. 3B centering on the lifting lever shaft 33. As a result, the presser foot 20 engaged with the tip of the lifting lever 31 is always pressed downward.

Then, when the sewing machine 1 is operated, that is, when the air cylinder 32b is driven in accordance with sewing, the lifting lever 31 rotates clockwise in FIG. 3 (b) against the pressing force of the pressing spring 32a. Power is given. As a result, the presser feet 20 and 20 are raised along the grooves 11 and 11.

When replacing the presser foot 20, loosen the adjusting screws 34b and 34b with respect to each of the lifting levers 31 and 31 positioned on the left and right sides of the push arm 10, and then the respective left and right front levers 31a, 31a) is slidably moved so that the adjustment screws 34b and 34b become the rear side of the long holes 34a and 34a, that is, the "release position B".

When the front lever 31a is in the "release position B", as shown in Fig. 4, the engagement between the presser foot 20 and the tip of the lifting lever 31 is released, and the presser foot 20 is provided with a groove 11, It is possible to slide up and down freely along 11). In this state, the presser foot 20 is appropriately replaced.

Here, the lifting lever 31 in the present embodiment is capable of stretching back and forth along the sliding movement on the front side, that is, the presser foot 20 side, than the lifting lever shaft 33, which is the point of swinging motion. When the sewing machine 1 is stopped, the upper end of the arm members 31c and 31c is caught by the air cylinder 32b, so that the swing of the rear lever 31b is regulated, so that the pressing force of the push spring 32a becomes the front lever. It does not affect the (31a) side. Therefore, when the presser foot 20 is replaced, the lifting lever 31 and the presser foot 20 are not affected by the pressing force by the pressing spring 32a connected to the rear side than the point of the swinging motion or the connection portion with the air cylinder 32b. ) Is released, the presser foot 20 is replaced (see Fig. 4 (b)).

As described above, according to the pressing device of the sewing machine of the present embodiment, when the presser feet 20 and 20 are replaced, the pressing force of the pressing spring 32a does not reach the front lever 31a, and a long hole with respect to the rear lever 31b. The front lever 31a connected by the 34a and the adjustment screw 34b can be easily set to the disengagement position B with a light force by sliding movement. Accordingly, the engaging engagement of the lifting lever 31 and the presser foot 20 can be easily released. Therefore, the burden on the operator for the exchange of the presser feet 20 and 20 can be reduced, and the exchange of the presser feet 20 and 20 can be facilitated. In addition, by using a thumbscrew or the like for the adjustment screw 34b, a tool is unnecessary and the presser feet 20 and 20 can be replaced very easily.

In addition, in this embodiment, although the case where the pressing device 100 of the sewing machine was mounted in the electronic cycle sewing machine was demonstrated, it is not necessarily limited to this, Various sewing machines equipped with the cloth pressing device which hold | maintain and move a cloth Needless to say, it is applicable.

In addition, the lifting lever 31 may be connected so that at least two or more other objects can be stretched back and forth on the presser foot 20 side from the point of the rocking motion, and three or more members can be stretched and connected. .

In addition, the connection part 33 is not limited to a sliding type, It is good also as a folding crank structure which has a node.

In addition, the long hole part 34a and the adjustment screw 34b which comprise the connection part 34 of the lifting lever 31 form the long hole part 34a in the back lever 31b side in this embodiment. Although it is made, the long hole part 34a may be provided in the front lever 31a side.

According to the invention as set forth in claim 1, the lifting lever is divided into a front lever on the front side and a rear lever on the rear side from the presser foot side than the point of the swinging operation of the lifting lever. Further, these front levers and rear levers are elastically connected back and forth on the presser foot side rather than at the point of rocking motion by a connecting portion capable of moving and locking the front lever back and forth with respect to the rear lever. As a result, the lifting lever can be stretched back and forth on the presser foot side rather than at the point of the swinging movement of the lifting lever. Therefore, for example, when the lifting operation granting means such as an air cylinder or a pressing spring imparts a driving force on the opposite side from the presser foot side with a point therebetween, the presser foot is not affected by the pressing pressure by the lifting operation applying means. It is possible to engage or disengage the lifting lever. Therefore, the engaging or disengaging operation of the presser foot and the lifting lever can be performed with a light force, thereby reducing the burden on the operator when the presser foot is replaced. That is, the presser foot can be easily replaced.

In addition, when the presser foot is replaced, even if a lifting operation giving means is used, for example, a linear actuator or the like, a structure that allows the lever to move back and forth between the lever and the lifting operation giving means is unnecessary. . For this reason, various things can be selected as the lifting | movement operation provision means.

In addition, the lifting lever can reduce the burden on the operator when the presser foot is replaced, and the presser foot can be easily replaced.

According to the invention of claim 2, in addition to obtaining the same effects as the invention of claim 1, the lifting lever is swinging operation by a sliding connection part formed by engaging engagement between a long hole and a shaft or a convex part. It can be freely stretched back and forth from the presser foot side than the point of. Therefore, the burden on the operator when replacing the presser foot can be reduced, and the presser foot can be easily replaced.

Claims (2)

A push arm for mounting the presser foot at the tip so that it can be moved and exchanged, and at the same time, allowing the base to be moved horizontally with respect to the sewing machine bed; As a pressing device of a sewing machine disposed on both sides of the pressing arm and having a pair of lifting levers, the tip of which is capable of engaging or detaching with respect to the presser foot, and which is normally given an elastic force to push the tip downward. The pair of lifting levers, By a rear lever axially supported relative to the push arm to which the elastic force is applied, and a front lever connected to be able to move back and forth with respect to the rear lever from the presser foot side than the point of the rocking motion. At the same time, the pressing device of the sewing machine characterized in that the front lever is engaged with or separated from the presser foot by moving back and forth. The method of claim 1, The connecting unit is a pressing device of the sewing machine, characterized in that the sliding type by the engaging engagement of the long hole and the shaft or convex portion.

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