JP2006314529A - Presser device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a presser device of a sewing machine, permitting easy replacement of a presser foot. <P>SOLUTION: The presser device of the sewing machine comprises a feed table which can be moved in the horizontal direction, the presser foot with an engagement hole, which is movable in the vertical direction at the distal end of the feed table and which is mounted in such a way as can be pulled out upward, a lifting lever whose distal end is engaged with the engagement hole for lifting the presser foot in the vertical direction, and a lifting motion applying means for applying the driving force to the lifting lever for pressing a cloth to be worked. The lifting lever is divided on the front side (the presser foot side) from the fulcrum of the lifting motion for lifting the presser foot in the vertical direction, so that the lifting lever is telescopic in the front/rear directions. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a presser device for a sewing machine, and more particularly to a presser device for a sewing machine having a presser foot that can be exchanged vertically.

  2. Description of the Related Art Conventionally, in a presser device for a sewing machine, a center portion of a lever is rotatably attached to a side surface of a presser arm that is provided with a presser foot that can be moved up and down at the tip and that can move back and forth. The end of the lever can be engaged with and disengaged from the presser foot, and the other end of the lever, that is, the front side can be moved up and down by driving means such as a spring or air cylinder. The presser foot engaged with the tip is driven up and down.

The presser foot is detachable with respect to the tip of the presser arm, and a presser device for a sewing machine is known in which the presser foot is replaceable (see, for example, Patent Document 1).
JP-A-9-285667

  However, in the presser device for the sewing machine shown in Patent Document 1, the lever is pivotally supported through the elongated hole, and the entire lever is moved rearward along the elongated hole to replace the presser foot. The load of the presser spring engaged with the rear end side of the lever as a means to generate the presser pressure always acts on the front end side of the lever, and it is possible to move the lever backward with a light operation when replacing the presser foot. There was a problem that it was difficult and increased the burden on the operator. In addition, when an actuator such as an air cylinder is used as the driving means for driving the presser foot up and down, if the actuator and the lever are connected, it is impossible to move the lever backward by a simple long hole. There is a problem that the structure must allow the movement of the lever because a large force acts.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a sewing machine feeding device that can easily replace a presser foot.

In order to solve the above problem, the invention according to claim 1 is:
A presser device for a sewing machine that performs movement positioning by pressing the sewing product with a presser foot,
A feed base for mounting the presser foot so as to be movable up and down and exchangeable, and for moving the sewing product on a support surface via the presser foot;
Elevating means that engages with the presser foot and raises and lowers the presser foot to switch between a presser state and a release state; and
The lifting means is
A lifting lever that is pivotally supported by the feed base and that lifts and lowers the presser foot by the swinging;
Elevating operation applying means for applying a swing driving force to the elevating lever, and
The lifting lever is
A front lever and a rear lever which are connected on the side of the presser foot with respect to the fulcrum of the swing operation; and a connecting portion which can move and lock the front lever back and forth with respect to the rear lever. The presser device for a sewing machine is characterized in that the lever is engaged or disengaged from the presser foot by moving back and forth forward and backward.

  According to a second aspect of the present invention, in the sewing machine presser device according to the first aspect of the present invention, the connecting portion is configured to be slidable by engagement between a long hole and a shaft or a convex portion. .

According to the first aspect of the present invention, the lifting lever is divided into the front lever on the front side and the rear lever on the rear side on the presser foot side with respect to the fulcrum of the swinging operation of the lifting lever. The front lever and the rear lever are connected to the rear lever so that the front lever can be extended and retracted forward and backward on the presser foot side with respect to the fulcrum of the swinging operation by a connecting portion that can move and lock the front lever back and forth. Thus, the lifting lever can be extended and retracted forward and backward on the presser foot side from the fulcrum of the swinging operation of the lifting lever. Therefore, for example, when the lifting / lowering motion imparting means applies the lifting / lowering driving force on the opposite side of the presser foot across the fulcrum, the presser foot and the lifting / lowering lever are not affected by the presser pressure by the lifting / lowering motion imparting means. Can be engaged or disengaged. Therefore, the work of engaging or disengaging the presser foot and the lift lever can be performed with a light force, and the burden on the operator required when replacing the presser foot can be reduced. That is, the presser foot can be easily replaced.
In addition, when the presser foot is replaced, a structure that allows the lever to move back and forth between the lever and the lifting / lowering motion imparting means even if, for example, a direct acting actuator is used as the presser pressure means. do not need. Therefore, various things can be selected as a raising / lowering operation | movement provision means.
In addition, the lifting lever can be reduced by the slide connecting portion, so that the burden on the operator when replacing the presser foot can be reduced, and the presser foot can be easily replaced.

  According to the second aspect of the invention, the same effect as that of the first aspect of the invention can be obtained, and in particular, the lifting lever is configured by engagement of the elongated hole and the shaft or the convex portion. The slide type connecting part can be freely expanded and contracted back and forth on the presser foot side from the fulcrum of the swinging operation. Therefore, the burden on the operator when replacing the presser foot can be reduced, and the presser foot can be easily replaced.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings when the present invention is applied to an electronic cycle sewing machine.

(Overall configuration of the embodiment)
A sewing machine presser device 100 (hereinafter, presser device 100) according to this embodiment is mounted on an electronic cycle sewing machine 1 shown in FIG.
An electronic cycle sewing machine 1 (hereinafter referred to as a sewing machine 1) includes a sewing machine frame 2 that is substantially U-shaped in appearance and is placed on a sewing machine table 3. The sewing machine 1 holds predetermined cloth data (seam pattern) on the cloth held by the presser device 100 when the presser device 100 holds the cloth to be sewn and moves relative to the sewing needle 5. ) Based sewing machine.
Here, the direction in which the sewing needle 5 moves up and down is the Z-axis direction (vertical direction), the longitudinal direction of the sewing machine arm portion orthogonal to this is the Y-axis direction (front-rear direction), and the Z-axis direction and the Y-axis direction are The direction orthogonal to both is defined as the X-axis direction (left-right direction).

(Sewing frame)
The sewing machine frame 2 includes a sewing machine arm portion 2a that extends in the front-rear direction and forms an upper portion of the sewing machine frame 2, a sewing bed portion 2b that forms a lower portion of the sewing machine frame 2 and extends in the front-rear direction, a sewing machine arm portion 2a, and a sewing bed portion 2b. And a vertical body portion 2c for connecting the two.
The sewing machine frame 2 is provided with a sewing machine motor, a power transmission mechanism, various mechanisms for sewing, and the like (not shown), which are the same as those well known in the art and will not be described in detail here. .

(Presser device)
Next, the sewing machine presser device 100 according to the present embodiment will be described.
The presser device 100 is a presser device that performs movement positioning by pressing a cloth to be sewn with a presser foot 20 to be described later, and includes a feed base 10 that is movable on a sewing machine bed portion 2b that is a support surface of the cloth, A pair of presser feet 20, 20 that are mounted on the table 10 so as to be movable up and down and exchangeable, and an elevating means 30 that engages with the presser feet 20, 20 and raises and lowers the presser feet 20, 20.

The feed base 10 has a base end portion standing on the sewing bed portion 2b near the front side of the vertical body portion 2c and a distal end portion extending between the sewing machine arm portion 2a and the sewing bed portion 2b. The distal end portion has a shape that protrudes to the vicinity of the sewing needle 5 that moves up and down on the distal end side of the sewing machine arm portion 2a (see FIGS. 1 and 5). Further, the feed base 10 is restricted from being bent upward by a receiving plate 31 d disposed above the feed base 10.
A driving means (not shown) disposed in the sewing machine frame 2 is connected to the base end of the feed base 10, 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 apply a driving force along the X-axis direction and the Y-axis direction to the feed base 10 via a gear mechanism, a drive shaft, a guide rail, etc., not shown, The drive amount and drive timing of each pulse motor are controlled by a control unit (not shown).
A cloth plate 4 for placing a cloth is connected to the base end of the feed base 10. The cloth board 4 is extended from the base end part of the feed stand 10 along the upper surface of the sewing machine bed part 2b to the front of the sewing machine bed part 2b.
Further, at an intermediate position in the Y-axis direction of the feed base 10, a lift lever shaft 33 that pivots through the feed base 10 in the X-axis direction and pivotally supports a lift lever 31 described later is rotatably provided. It has been.
At the tip end (front end) of the feed base 10, support portions for 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 feed base 10 moves the work to be sewn placed on the sewing machine bed 2b serving as a support surface on the support surface via a presser foot 20 which will be described later, which is mounted in the grooves 11, 11. It has become.

  The presser feet 20 and 20 are engaged in grooves 11 and 11 formed in parallel along the vertical direction (Z-axis direction) at the distal end of the above-described feed base 10 with the slide plate-like portion 20c which is the base end thereof. It is provided so as to be slidable only in the vertical direction, that is, in the Z-axis direction while being held by the locking plate 12 so as not to be removed forward. The upper and lower portions of the groove portions 11 and 11 are opened, and the slide plate-like portions 20c and 20c of the presser feet 20 and 20 can be extracted from above or below the groove portions 11 and 11, and are equipped so as to be replaceable. . Moreover, two long holes 11a and 11a are formed in the rear surface of the support portion so as to penetrate in the front-rear direction along the groove portions 11 and 11, respectively. Two elevating levers 31 and 31 to be described later are inserted into the elongated holes 11a and 11a from the rear, respectively, and engaged with the slide plate-like portions 20c and 20c of the presser feet 20 and 20 to be moved up and down. It is like that.

The upper portions of the presser feet 20 and 20 are rectangular sliding plate portions 20c and 20c. The lower ends of the presser feet 20 and 20 are U-shaped, and when the U-shaped frame portions 20a and 20a of the left and right presser feet 20 and 20 are combined, a square frame is formed.
The presser feet 20, 20 extend obliquely downward on the front side from the sliding plate-like portions 20 c, 20 c of the presser feet 20, 20 described above, and are upward at the lowest point of the vertical movement of the presser feet 20, 20. To abut the cloth on the cloth plate 4 and press the cloth.
Further, the sliding plate-like portions 20c, 20c of the presser feet 20, 20 described above are provided on the sliding plate-like portions 20c.
Through holes 20b and 20b are provided that penetrate c and 20c back and forth along the Y-axis direction. The elevating levers of elevating means 30 for driving the presser feet 20 and 20 up and down by engaging with the through holes 20b and 20b are connected to the through holes 20b and 20b (see FIG. 5).

The lifting / lowering means 30 is pivotally supported at a substantially central portion of the feed base 20 described above and is engaged or disengaged from the presser feet 20 and 20 by moving one end forward and backward. 20 and 20 are moved up and down to switch between the presser state and the release state. The pair of left and right lift levers 31 and 31 engaged with the presser foot 20 and 20 and the lift levers 31 and 31 are driven. Elevating operation applying means 32 for applying force is provided (see FIGS. 1 and 2).
The elevating levers 31 and 31 are juxtaposed on the left and right ends of the above-described feed base 10, and can swing around the X axis with a lift lever shaft 33 provided at a substantially central portion of the feed base 10 as a fulcrum. ing. Each lifting lever 31, 31 is composed of two separate bodies, a front lever 31 a and a rear lever 31 b, and each front lever 31 a, 31 a and rear lever 31 b, 31 b is a swing of the lifting lever 31, 31. They are connected to each other via the connecting portion 34 on the above-mentioned presser foot 20, 20 side than the fulcrum of the moving operation.
The rear ends of the rear levers 31b and 31b extend to the base end side of the feed base 10 and are connected to the presser spring 32a. Further, the substantially central portion of the rear levers 31b and 31b is fitted to the above-described lifting lever shaft 33 and is pivotally supported. The rear levers 31b and 31b are always urged upward by the presser spring 32a at the rear end, and the front end is urged downward. Two elongate holes 34a are formed on the front end of the rear levers 31b and 31b, that is, one end on the front side, along the Y-axis direction, that is, the front-rear direction. Then, the rear ends of the front levers 31a and 31a are connected and fixed to the front ends of the rear levers 31b and 31b through shafts and set screws inserted into the long hole portions 34a and 34a.
Further, one end (lower end) of each of the arm members 31c and 31c is fixed to the rear levers 31b and 31b, respectively, and the other end of the arm members 31c and 31c protrudes upward from the rear levers 31b and 31b. 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 separated from the upper portion of the arm members 31c and 31c, and further the arm member. The rear levers 31b and 31b are driven up and down via 31c and 31c.

The front levers 31a and 31a are connected with their rear ends facing the surface on the feed base 10 side of the rear lever on the front side of the rear levers 31b and 31b described above. On the other hand, the front levers 31a and 31a are inserted into the through holes 20b and 20b formed in the presser foot 20 and 20 through the elongated holes 11a and 11a of the support portion of the feed base 10, respectively.
In other words, the front levers 31a, 31a and the rear levers 31b, 31b are connected to the connecting portion 34 on the front side of the lifting lever shaft 33, that is, the presser foot 20 side, which is a fulcrum of the swinging operation of the rear levers 31b, 31b. It is connected so that it can be expanded and contracted back and forth via the.

Specifically, the connecting portion 34 is composed of a long hole portion 34 a and an adjusting screw 34 b of the shaft 34 c, and is a slide type by engagement thereof, and is connected to the feed base 10 via the elevating lever shaft 33. Has been. The front lever 31a can be moved back and forth by sliding movement relative to the rear lever 31b in which the relative back-and-forth movement with respect to the feed base 10 is restricted (FIGS. 3A, 3B, 3C). (Refer FIG. 4 (a), (b)).
The connecting portion 34 can move and adjust the front lever 31a back and forth while the adjustment screw 34b is loosened, and can be fixed in position by fastening the adjustment screw 34b.
Further, as an adjustment position when the front lever 31a is moved back and forth, the adjustment screw 34b is located at the front side of the long hole 34a ("engagement position A") (see FIG. 3), and the adjustment screw 34b is a long hole 34a. There is a “separation position B” (see FIG. 4) located near the rear of the front lever 31a.
These can be selectively switched by moving forward and backward.
In other words, at the “engagement position A”, the tip of the front lever 31 a is inserted into the through hole 20 b of the presser foot 20 so that the elevating lever 31 and the presser foot 20 are engaged.
In the “disengagement position B”, the front end of the front lever 31a is disengaged from the through hole 20b of the presser foot 20 and the engagement is released. In addition, when the front lever 31a is in the “disengagement position B” and the engagement between the front lever 31a and the presser foot 20 is released, the presser feet 20 and 20 are moved upward (or downward) along the grooves 11 and 11. The presser foot 20 can be exchanged.

The raising / lowering motion imparting means 32 includes a presser spring 32a connected to the rear end of the lifter lever 31 and an air cylinder 32b as an actuator that drives the lifter lever 31 against the urging force of the presser spring 32a. .
The presser spring 32a acts on the rear end of the elevating lever 31 and constantly urges the rear end of the elevating lever 31 upward, so that the other end of the elevating lever 31, that is, the front end is always lower. Energized. As a result, when the presser foot 20 is engaged with the tip of the lift lever 31, the presser foot 20 is always urged downward.
The air cylinder 32b is driven in response to a command from a control unit (not shown), and applies a driving force for pressing the rear end of the elevating lever 31 downward against the urging force of the presser spring 32a. Thus, the presser foot 20 connected to the tip of the elevating lever 31 is pushed upward. The actuator that drives the lift lever 31 is not limited to the air cylinder 32b, and for example, a pulse motor, a solenoid, or the like can be applied.

  Then, the lifting lever 31 is swung around the X axis with the lifting lever shaft 33 as a fulcrum according to the driving of the air cylinder 32b, so that the presser foot 20 engaged with the tip of the lifting lever 31 is formed in the groove 11. It can be moved up and down along.

Next, the operation of the sewing machine presser device 100 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 elevating lever 31 is in the “engagement position A” will be described. As described above, the rear lever 31a is connected to the rear lever 31b on the front side of the elongated hole portion 34a, as described above. The front end of the front lever 31 a is inserted through the through hole 20 b of the presser foot 20.
Here, while the air cylinder 32b is stopped, an upward biasing force is always applied to the rear end of the elevating lever 31 (rear lever 31b) by the presser spring 32a. Therefore, a biasing force in the counterclockwise direction in FIG. 3B is applied to the lift lever 31 around the lift lever shaft 33. As a result, the presser foot 20 engaged with the tip of the lifting / lowering lever 31 is always pressed downward.
Then, when the air cylinder 32b is driven when the sewing machine 1 is operated, that is, with sewing, the lifting lever 31 is given the rotational force in the clockwise direction in FIG. 3B against the urging force of the presser spring 32a. Is done. Accordingly, the presser feet 20 and 20 are raised along the grooves 11 and 11.
When the presser foot 20 is replaced, after loosening the adjusting screws 34b and 34b for each of the elevating levers 31 and 31 positioned on the left and right of the feed base 10, the left and right front levers 31a and 31a are adjusted with the adjusting screws 34b and The sliding movement is made so that 34b is located behind the elongated holes 34a, 34a, that is, the “detachment position B”.

  When the front lever 31a is in the “disengagement position B”, as shown in FIG. 4, the engagement between the presser foot 20 and the tip of the elevating lever 31 is released, and the presser foot 20 extends along the grooves 11 and 11. Thus, it is possible to slide up and down freely. In this state, the presser foot 20 is appropriately replaced.

  Here, the elevating lever 31 in the present embodiment can be expanded and contracted forward and backward by sliding movement on the front side, that is, the presser foot 20 side, relative to the elevating lever shaft 33 that is the fulcrum of the swinging operation. When the arm member 31c is stopped, the upper end of the arm members 31c and 31c is locked to the air cylinder 32b so that the swinging of the rear lever 31b is restricted. Therefore, the urging force of the presser spring 32a reaches the front lever 31a side. There is nothing. Therefore, when the presser foot 20 is replaced, the lift lever 31 and the presser foot 20 are not affected by the urging force of the presser spring 32a connected to the rear side of the fulcrum of the swinging operation or the connecting portion with the air cylinder 32b. The engagement is released and the presser foot 20 is exchanged (see FIG. 4B).

  As described above, according to the presser device for the sewing machine according to the present embodiment, when the presser feet 20 and 20 are replaced, the urging force of the presser spring 32a does not reach the front lever 31a and the rear lever 31b is not affected. The front lever 31a connected by the elongated hole 34a and the adjusting screw 34b can be easily moved to the disengagement position B by a light movement. Thereby, engagement with the raising / lowering lever 31 and the presser foot 20 can be cancelled | released easily. Therefore, the burden on the working company in the replacement of the presser feet 20 and 20 can be reduced, and the presser feet 20 and 20 can be easily replaced. Further, by using a thumbscrew or the like for the adjustment screw 34b, the presser feet 20 and 20 can be replaced very easily without the need for a tool.

In this embodiment, the case where the sewing machine presser device 100 is mounted on the electronic cycle sewing machine has been described. However, the present invention is not necessarily limited to this, and various types of presser devices that hold and move the cloth are mounted. Needless to say, it is applicable to other sewing machines.
Further, it is sufficient that at least two or more separate members of the lifting / lowering lever 31 are connected to each other so as to be extendable back and forth on the presser foot 20 side with respect to the fulcrum of the swing operation, and three or more members are connected to be extendable. It may be a configuration.
Moreover, the connection part 33 is not limited to a slide type, It is good also as a foldable crank structure which has a node.
Further, in the present embodiment, the elongated hole portion 34a and the adjusting screw 34b constituting the connecting portion 34 of the elevating lever 31 are configured such that the elongated hole portion 34a is provided on the rear lever 31b side, but the elongated hole portion 34a is provided on the front lever 31a side. The part 34a may be provided.

It is a perspective view which shows the whole structure of the sewing machine in this embodiment. It is a disassembled perspective view which shows the principal part structure of the presser device of the sewing machine which concerns on this embodiment. FIG. 3A is a plan view showing an engagement position of the presser device for the sewing machine according to the present embodiment, and FIG. 3B is a side view thereof. FIG. 4A is a plan view showing a separation position of the sewing machine presser according to the present embodiment, and FIG. 4B is a side view thereof. It is an expansion perspective view showing the important section composition of the presser device of the sewing machine concerning this embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electronic cycle sewing machine 2 Sewing machine frame 2a Sewing machine arm part 2b Sewing machine bed part 2c Vertical trunk | drum 3 Sewing machine table 4 Fabric board 5 Sewing needle 10 Feeding base 11 Groove part 11a Long hole 12 Locking plate 20 Presser foot 20a Needle hole 20b Through hole 20c Sliding plate-like portion 30 Lifting means 31 Lifting lever 31a Front lever 31b Rear lever 31c Arm member 31d Receiving plate 32 Lifting motion imparting means 32a Pressing spring 32b Air cylinder 33 Lifting lever shaft 34 Connecting portion 34a Long hole portion 34b Adjusting screw 100 Pressing device A Engagement position B Disengagement position

Claims (2)

A presser device for a sewing machine that performs movement positioning by pressing the sewing product with a presser foot,
A feed base for mounting the presser foot so as to be movable up and down and exchangeable, and for moving the sewing product on a support surface via the presser foot;
Elevating means that engages with the presser foot and raises and lowers the presser foot to switch between a presser state and a release state; and
The lifting means is
A lifting lever that is pivotally supported by the feed base and that lifts and lowers the presser foot by the swinging;
Elevating operation applying means for applying a swing driving force to the elevating lever, and
The lifting lever is
A front lever and a rear lever which are connected on the side of the presser foot with respect to the fulcrum of the swing operation; and a connecting portion which can move and lock the front lever back and forth with respect to the rear lever. A presser device for a sewing machine, wherein the lever is engaged with or disengaged from the presser foot by moving back and forth forward and backward.   The sewing machine presser device according to claim 1, wherein the connecting portion is configured to be slidable by engagement between the elongated hole and a shaft or a convex portion.

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