JP2762693B2 - Presser frame attachment / detachment device with incorrect insertion prevention function - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a presser frame attaching / detaching device having an erroneous insertion preventing function for a cloth presser of an electronically controlled pattern sewing machine.

(Prior art)

2. Description of the Related Art An electronically controlled pattern stitch sewing machine used in a sewing factory or the like generally has a feed plate that is moved on a table in two directions of X-axis and Y-axis, respectively, and a work cloth is pressed on the feed plate. A presser device that moves integrally with the feed plate is provided. The presser device includes a presser arm, a lateral gate presser foot attached to a front end of the presser arm, a presser frame rotatably and detachably attached to a lower end of the presser foot, and a lower surface of the presser frame. And a press plate that is detachably attached and presses the work cloth onto the feed plate.

The presser frame is made rotatable around the pin member by engaging the pin members at the center of the left and right ends with the pivot portions at the left and right ends of the presser foot, and when the thickness of the work cloth is not uniform. The work cloth can be held at an appropriate angle.
The presser foot, the presser frame, and the presser plate are configured so that the presser foot, the presser frame, and the presser plate can be switched between a presser position that presses the work cloth on the feed plate and a standby position that is retracted upward for replacement of the work cloth or the presser plate. ing.

[Problems to be solved by the invention]

When the presser frame is attached to the presser foot in a regular state, the rectangular area inside the presser frame is a sewable area, and the sewing needle does not collide with the presser frame. In such a case, there is not a small number of accidents in which the presser frame is mounted on the presser foot while the right and left sides of the presser frame are erroneously reversed.

That is, when the presser frame is attached to the front and rear oppositely, the sewing needle collides with the presser frame, or only an opening having a shape corresponding to the pattern being sewn (for example, a heart-shaped opening slightly larger than that in the case of a heart-shaped pattern). Since the sewing needle collides with the presser plate that is not formed, the presser frame, the presser plate, the sewing needle, and the like are damaged.

In addition, since a perfect pattern cannot be formed on the work cloth,
There is a problem that the work cloth is also wasted.

An object of the present invention is to provide a presser frame attaching / detaching device having an erroneous insertion prevention function that allows the presser frame to be mounted on the presser foot in a predetermined positional relationship.

[Means for solving the problem]

A presser frame attaching / detaching apparatus having an erroneous insertion prevention function according to the present invention includes a presser arm that moves integrally with a movable feed plate for placing a work cloth, a presser foot attached to the presser arm, and a presser foot. A presser frame for an electronically controlled pattern sewing machine, comprising: a presser frame detachably mounted on the feeder and rotatably mounted around a horizontal rotation axis. A first shaft member provided at one end in the direction of the dynamic axis and a second shaft member provided at the other end and asymmetric with the first shaft member; and a first shaft member provided at one end of the presser foot is detachable. A second engaging portion provided at the other end of the first engaging portion and the presser foot to be freely engaged;
The shaft member is detachably engaged and includes a first engagement portion and an asymmetric second engagement portion.

[Action]

In the presser frame attaching / detaching device having an erroneous insertion prevention function according to the present invention, the first shaft member of one end member of the presser frame and the second shaft member of the other end portion are formed asymmetrically, and are provided at one end of the presser foot. The first engaging portion provided and in which the first shaft member is detachably engaged and the second engaging portion provided in the other end portion and in which the second shaft member is detachably engaged are formed asymmetrically. As a result, the presser frame can be mounted on the presser foot with the proper positional relationship, but cannot be mounted on the presser foot with the wrong positional relationship in which the presser frame is reversed left and right.

〔The invention's effect〕

According to the holding frame attaching / detaching device having the function of preventing erroneous insertion according to the present invention, as described above, the first shaft member and the asymmetric second shaft member, the first engagement portion and the asymmetric second engagement therewith By providing the part, the presser frame can be attached to the presser foot with an incorrect positional relationship, and it is possible to reliably prevent the work clamp and the sewing needle from being damaged and the work cloth from being wasted. In addition, the present invention has the advantages that the structure is simple, the number of components is not increased, and the required space is not increased.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The present embodiment is an example in which the present invention is applied to a cloth presser provided in a general industrial electronic control type pattern sewing machine (hereinafter referred to as a sewing machine).

As shown in FIG. 1, a sewing machine main body having a bed 2, a pillar 3 and an arm 4 is provided on a sewing machine frame 1 of the sewing machine M, and a control unit and a stepping motor are provided in the sewing machine frame 1. 5 and the like are provided. A table 6 is provided at the front end of the bed 2,
A feed plate 7 which is independently moved and driven in two directions of X-axis and Y-axis and is position-controlled is provided on the table 6. A cloth presser for pressing the work cloth W on the feed plate 7 includes a presser arm 8 and a presser arm 8. A presser foot 9 attached to the presser arm 8, a presser frame 10 removably mounted on the presser foot 9, and a presser plate 11 removably mounted on the lower surface of the presser frame 10. The rear end of the feed plate 7
The holding arm 8 is fixed to the movable member fixed to
And is moved and driven integrally in two directions of X-axis and Y-axis. The drive system and the control system of the sewing machine M and the drive system and the control system of the feed plate 7 are the same as those of the existing machine, and the needle bar 12 of the sewing machine M and the sewing needle 13 at the lower end thereof are selected while reciprocating up and down. The pattern is automatically sewn by automatically controlling the positions of the feed plate 7 in the two directions of the X axis and the Y axis based on the stitch data of the pattern.

As shown in FIGS. 2 to 4, the presser foot 9 has a gate shape in plan view, and a base end engaging member 9a of a rear end central member is vertically movable to a mounting member 8a at a front end of the presser arm 8. The pair of left and right air-driven cylinders 14 provided on the presser arm 8 are engaged and can be switched between a press position where the presser foot 9 is lowered and a standby position where the presser foot 9 is raised.

The front end portions of the left and right legs 15 of the presser foot are respectively provided with first engagement portions.
The second engaging portion 16 and the second engaging portion 17 are provided asymmetrically on the same horizontal axis. The holding frame 10 is mainly composed of a metal plate having a rectangular frame shape in plan view, and has a first shaft member 18 detachably engaged with the first engaging portion 16 from below at the center of both left and right ends thereof. A second shaft member 19 detachably engaged with the second engagement member 17 from below is provided asymmetrically on the same left-right axis.

As shown in FIG. 8, the first shaft member 18 is provided so as to horizontally project leftward from the left end face of the metal fitting 20 fixed to the upper surface of the holding frame 10, and the second shaft member 19 is provided with the holding frame 10 Is provided so as to horizontally project rightward from the right end face of the metal fitting 21 fixed to the upper surface of the first shaft member 18, and the length A of the first shaft member 18 is formed longer than the length B of the second shaft member 19. I have.

As shown in FIGS. 5 and 6, the first engaging portion 16 is elastically urged by a left-right horizontal groove 22 in which the first shaft member 18 is fitted over the entire width of the leg portion 15 and a spring 23. A pair of steel balls 24 holding the first shaft member 18 from both sides;
17 is a horizontal groove 25 facing left and right such that the second shaft member 19 fits over approximately half the width of the leg 15 but the first shaft member 18 does not.
And a pair of steel balls 27 elastically urged by a spring 26 to hold the second shaft member 19 from both sides. The groove 25 of the second engaging portion 17 is formed on the right side of the groove similar to the groove 22 by a wall forming piece 28.
Are fitted and fixed.

The lower part of the left and right legs 15 of the presser foot 9 is provided on a portion of the left end of the holding frame 10 behind the first shaft member 18 and a portion of the right end of the holding frame 10 behind the second shaft member 19, respectively. The protruding portions 10a that are in contact with each other are formed so that the pressing force from the leg portions 15 can be transmitted, but these protruding portions 10a can be omitted.

Next, the holding plate 11 detachably attached to the lower surface of the holding frame 10 will be described.The holding plate 11 is made of a metal plate or a synthetic resin plate, and the pattern to be sewn as shown in FIG. In the case of the letters A and B, the openings 29 and 30 having an outer contour slightly larger than the outer contour of each of these patterns are formed.
It is formed appropriately according to the pattern to be sewn so that the work cloth W can be pressed as widely as possible. As shown in FIG. 3, a central portion near the left end and a central portion near the right end of the holding frame 10 are detachably engaged with and held by the first elastic holding portions 31 of the holding frame 10, respectively. A first pin member 37 is provided, and a second elastic holding portion of the holding frame 10 is provided at the center of the right end of the holding plate 11.
A second pin member 38 which is detachably engaged with and held from below at 34 is provided.

The first elastic holding portion 31 includes a first pin hole 32 and a U-shaped spring member 33 fixed with a pair of screws, and the second elastic holding portion 34 has a larger diameter than the first pin hole 32. And a second pin hole 35 elongated in the left and right directions and a U-shaped spring member 36 fixed by a pair of screws. As shown in FIG. 11, the first pin member 37 has a tapered head portion 37a and a neck portion 37b having a smaller diameter than this, so that when the first pin member 37 is inserted into the first pin hole 32, The head 37a is locked by the spring member 33. Second pin member 3
8 has the same structure as the first pin member 37,
7 and fits in the second pin hole 35, but the first pin hole 3
It does not fit in 2.

 The operation of the above described presser device will be described.

When the presser frame 10 is set on the presser foot 9 in a regular positional relationship, the first shaft member 18 can be engaged with the first engaging portion 16 and the second shaft member 19 can be engaged with the second engaging portion 17. The presser frame 10 can be detachably attached to the presser foot 9 from below. However, since the first shaft member 18 does not fit in the second engaging portion 17, it is possible to reliably prevent the holding frame 10 from being erroneously turned right and left and the front and rear sides being reversed, so that the holding frame 10 is attached to the holding foot 9. I can do it.

When the holding plate 11 is set in the holding frame 10 in a regular positional relationship, the first pin member 37 can be engaged with the first pin hole 32 and the second pin member 37 can be engaged.
Since the pin member 38 can be engaged with the second pin hole 35, the holding plate 11
Can be detachably attached to the holding frame 10 from below. However, since the second pin member 38 is larger in diameter than the first pin hole 32 and does not fit in the first pin hole 32, it is ensured that the right and left sides of the holding plate 11 are mistaken and the front and rear sides are reversed, and that the holding plate 11 is mounted on the holding frame 10. Can be prevented.

Note that the first shaft member 18 and the second shaft member 19 are formed to have the same length and the diameter of the first shaft member 18 is increased, so that the first shaft member 18 fits into the first engagement portion 16. You may comprise so that it may not fit in the 2 engagement part 17.

As for the holding plate 11, the first pin member 37 and the first elastic holding portion 31 and the second pin member 38 and the second elastic holding portion 34 may be provided at mutually rotationally asymmetric positions. Alternatively, two sets may be provided, and the second pin member 38 may be the same size as the first pin member 37, and the dimensions L1 and L2 in FIG. 10 may be different, so that the positions of the holding frame 10 and the holding plate 11 are different. Erroneous mounting may be reliably identified from the relationship.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a perspective view of an electronically controlled pattern stitch sewing machine, FIG. 2 is a side view of a main part of the sewing machine, and FIGS. FIG. 5 is a plan view and a front view of the holding frame, FIG.
FIG. 7 is an enlarged view taken in the direction of the arrow in FIG. 4, FIG. 7 is a front view of the holding frame, FIG. 9 is a front view of the holding plate, FIG. 10 is a plan view of the holding plate, FIG. The figure is an enlarged sectional view of a main part of the holding frame and the holding plate. 7 ... feed plate, 8 ... presser arm, 9 ... presser foot, 10 ... presser frame, 16 ... first engagement part, 17 ... second engagement part, 18 ... first shaft member, 19: Second shaft member.

Claims (1)

(57) [Claims] A presser arm that moves integrally with a movable feed plate for placing a work cloth, a presser foot attached to the presser arm, and a horizontal pivot shaft that is detachably attached to the presser foot. A presser frame for an electronically controlled pattern stitch sewing machine having a presser frame rotatably mounted around and pressing a work cloth onto a feed plate, wherein the presser frame is provided at one end in a rotation axis direction of the presser frame. A first shaft member and a second shaft member provided at the other end and asymmetric with the first shaft member; a first engagement portion provided at one end of the presser foot and removably engaged with the first shaft member. A second shaft member provided at the other end of the presser foot, the second shaft member is detachably engaged, and the first engagement portion and the asymmetric second engagement portion are provided. Presser frame attaching / detaching device.