JPH049991Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to a buttonhole machine for sewing machines, which is detachably attached to the throat plate fixed to the sewing machine bed, and is moved by a movement mechanism inside the sewing machine bed. At the same time, buttonholes are stitched by cooperating with the movement of the needle bar on the sewing machine arm side.

(Conventional technology) The conventional buttonhole machine for sewing machines was developed in 1983.
As shown in No. 7553 (Utility Model Application No. 120158, 1983), there is a type that uses the needle bar movement as a driving source, and a model that uses the needle bar movement as a driving source, as shown in Utility Model Application No. 120158
As shown in No. 145082 (Utility Model Application Publication No. 54-72958), there are two methods, one in which the motion of a motion mechanism in the bed is used as a drive source, and the present invention belongs to the latter type, but the conventional With this type, it is difficult to set the bed and the cloth, and in particular, the cloth floats due to its structure, which causes the cloth to flap.

(Problems to be Solved by the Invention) The present invention enables the buttonhole maker to be attached to the sewing machine bed by inserting it into a set hole pre-provided in the throat plate fixed to the sewing machine bed, and also creates beautiful buttonholes. It was designed so that it could be moved.

(Means for Solving the Problems) The present invention is composed of a mechanism base, a cloth guide plate, and a cam plate, and the mechanism base is inserted into a hole formed in a throat plate fixed to a sewing machine bed, and a spring is inserted into the mechanism base. The combination of pressing forces makes it easy to attach to the sewing machine bed, and a protrusion with approximately the same height as the thickness of the fabric guide plate is formed around the needle drop on the top of the mechanism table to eliminate flapping of the fabric. This is what I did.

(Function) This invention sets the position by inserting a pin provided on the bottom surface of the mechanism table into a hole shaped in the needle plate fixed to the sewing machine bed, and also directs the movement of the cloth guide plate relative to the mechanism table by projecting it onto the top surface of the mechanism table. The long groove of the cloth guide plate is fitted into the protrusion provided to make it rotatable, and the fabric placed on the upper surface of the protrusion and the cloth guide plate can be moved back and forth and from side to side, thereby preventing the fabric from flapping and creating a beautiful appearance. It is characterized by sewing buttonholes.

(Embodiment) An embodiment of the present invention will be described below. Reference numeral 1 denotes a mechanism base formed in a flat plate shape, and a pin 2 on the lower surface that is fitted into a hole formed in a throat plate 50 fixed to the upper surface of the sewing machine bed A. 2 and a drive mechanism section 3 at the end.
A spring 4 is provided to protrude from the side surface of the drive mechanism part, and a relief part 5 is formed at a position facing the feed dog 54 which is moved so as to protrude upward from the through hole of the throat plate 50. A protruding part 56 having a height slightly thinner than the thickness of a cloth guide plate to be described later is provided on the upper surface of the mechanism base 1 around the needle insertion hole 7 including the circular boss part 6. Boss part 6
A through hole 19 for monitoring the bobbin thread bobbin is formed in the center, and a small gear 8 is rotatably mounted on the upper surface approximately at the center of the portion where the drive mechanism section 3 is disposed.

Reference numeral 9 denotes a drive shaft which is rotatably supported by the mechanism stand 1 and the support part 10 in the drive mechanism section 3, and the drive shaft has one end protruding from the side of the mechanism stand 1. A rocking body 16 is provided with an engaging lever 13 formed by an engaging piece 12 bent downward at the other end, and a tension spring 15 is attached to the other arm 14. A coil spring 17 is attached to the outer periphery of the drive shaft 9, one end of which is locked to the swinging body 16, and whose inner diameter is slightly smaller than the shaft diameter of the drive shaft 9. Further, a bending washer 18 made of an elastic material is provided on the side surface.

Reference numeral 30 denotes a cloth guide plate, and a cloth placing section 31 and a cam mounting section 32 are disposed on the upper surface, and the cloth placing section 31
has a long groove 33 in which a protrusion 56 including the circular boss 6 is fitted in the center, and the outer periphery of the boss can slide.
A plurality of protrusions 34, 34 are formed on the upper surface to prevent the cloth from slipping, and the cam mounting portion 32 is provided with a horizontal groove 35, and a rectangular groove is formed approximately in the center of the bottom of the groove. A through hole 36 is bored.

Longitudinal cam guide grooves 37, 37 are formed on both sides of the lateral groove 35, and a small protrusion 39 is formed on the end face of one side of the lateral groove 35. The stopper 38 is urged inwardly into the groove by an elastic material.

Reference numeral 40 denotes a cam plate, on which internal tooth rows 41, 41 for buttonhole stitching of a plurality of different sizes are arranged in parallel, and can slide by fitting into the horizontal groove 35 of the cam mounting portion 32 on the side surface. Nayoku cam guide groove 3
Engagement convex portions 42, 42 are formed on 7, 37, and engagement grooves 4 are formed at opposing positions of the internal tooth rows 41, 41, respectively.
3 are arranged.

Reference numeral 51 denotes a horizontal feed arm which is oscillated in conjunction with the operation of the sewing machine about a horizontal feed shaft 52 supported by the sewing machine bed mechanism.

Reference numeral 53 denotes a feed base, to which a feed dog 54 is fixedly attached above, and a horizontal movement is imparted by the swinging movement of the feed groove 51, as well as a vertical feed arm (not shown).
Due to this movement, the feed dog 54 is given a vertical movement, and the feed dog 54 performs a four-feed movement.

Reference numeral 55 denotes a drive pin, which is disposed at an appropriate location on the horizontal feed arm 51 and is made to swing together with the horizontal feed arm 51.

Since the present invention has the above structure, the pins 2, 2 provided on the lower surface of the mechanism base 1 are fitted into holes formed in the throat plate 50 fixed to the upper surface of the bed, and the cooperative action by the spring 4 is applied. Attach mechanism stand 1 to bed A. At this time, the engagement piece 12 of the engagement lever is inserted into a hole formed in the needle plate and engaged with the drive pin 55. Next, attach the cam plate 40 to the cloth guide plate 30.
The cloth guide plate 30 is positioned and set in the horizontal groove 35 and placed on the upper surface of the mechanism table 1, and
is fitted onto the outer periphery of the protruding portion 56 including the circular boss 6 of the mechanism base 1, and the internal teeth of the tooth row 41 in the button hole formed on the desired cam plate 40 set are engaged with the pinion 8 of the mechanism base 1, and then After placing the cloth on the cloth placement part 31 of the cloth guide plate 30, lower the presser foot of the sewing machine and place the cloth on the cloth guide plate 30 with a cloth presser foot (not shown) attached to the lower part of the presser foot. Press it onto the top surface to complete the preparation.

Next, by operating the sewing machine, the needle bar (not shown) is moved up and down and horizontally, and the thread ring catcher is also moved, so that appropriately oscillated stitches are formed on the fabric.

When the sewing machine is operated, the engaging piece 12 at the tip of the engaging lever 13 is moved by the drive pin 55 of the horizontal feed arm 15, but the oscillating body 16 controls the action of the spring 15. Therefore, the engagement lever 13 is caused to swing together with the swinging body 16.

The drive shaft 9 at the center of the oscillating body rotates together with the oscillating body 16 only in one direction due to the coiled spring 17, but in the other direction is subjected to the action of the bending washer 18 and is released by the inner diameter expansion action of the coiled spring 17. Since rotation is prevented, intermittent rotation in one direction is performed. Therefore, the cam plate 40 is rotated via the pinion 8, and the cloth guide plate 30, which is integrally connected to the cam plate 40, is rotated around the circular boss portion 6 of the protrusion 56 that contacts the long groove 33. The buttonhole stitching is performed by moving the cloth and the cooperative action of the needle and the thread ring catcher. When the operating lever 11 is manually reciprocated, the oscillating body 16 is repeatedly oscillated, so that the pinion 8 is intermittently rotated, and the cloth guide plate 30 is rotated via the cam plate 40 to the needle drop position. The position is adjusted relative to.

(Effects) The present invention has the above-mentioned configuration and movement, but since the mechanism base 1 can be installed so as to overlap the throat plate 50 fixed to the upper surface of the sewing machine bed A, it is convenient for the user. It is extremely easy to use and operate.

Also, a circular boss portion 6 protruding from the top surface of the mechanism table 1
The thick protrusion 56 that surrounds the needle insertion hole 7 makes it easy to attach the cloth guide plate 30 to the mechanism base 1, and the cloth placed on the cloth guide plate does not move when the needle moves up and down. Since there is no flapping, it is possible to prevent stitches from flying out and not being able to make stitches, or from buttonholes resulting in inaccurate shapes.

As described above, the present invention is extremely easy to operate for the sewing machine operator, and has a great practical effect in that the finished sewing is beautiful.

[Brief explanation of the drawing]

The drawings are examples of the present invention, and Fig. 1 is a plan view of the main part of the invention, Fig. 2 is a side view of a cross section of a part of the main part of the invention, and Fig. 3 is a bottom view of the main part of the invention. Figure 4 is a plan view of the present invention, and Figure 5 is a side view of the main parts of the present invention installed on a sewing machine, where 1 is a mechanism base, 2 is a pin, 4 is a spring, 6 is a circular boss, and 8 30 is a pinion, 30 is a cloth guide plate, 33 is a long groove, 40 is a cam plate, 41 is an internal tooth row, 50 is a throat plate, and 56 is a protrusion.

Claims (1)

[Scope of utility model registration request] A mechanism stand in which a pinion, which is driven by a part of the movement mechanism in the sewing machine bed and is rotated intermittently, is disposed on the top surface of the bed plate, and an internal tooth row that is placed on the top surface of the mechanism table and meshes with the pinion is formed. In a button holer for a sewing machine, which is configured with a cloth guide plate equipped with a cam plate, the buttonhole buttonhole protrudes from the upper surface of the mechanism base at a height slightly thinner than the thickness of the cloth guide plate, and is formed on the outer periphery of the cloth guide plate. A button holer for a sewing machine, comprising a protrusion including a circular boss in which a long groove is fitted and slidably guides the cloth guide plate by its outer periphery.