JPS6314785Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Field of industrial application The present invention relates to an improvement of a hem ruler device for performing hem hem stitching, top stitching, hem stitching, etc. in a sewing machine.

(B) Prior art Generally, when performing hem stitching, top stitching, hem stitching, etc., a fixed hem ruler is installed on the front side of the needle drop of the sewing machine body, and the fabric of this fixed hem drawer ruler is For example, place the outer side of the lower bent part of the edge of the fabric bent in an S-shape along the fabric feeding direction in contact with the guide surface, and insert the needle while aligning the lower bent part with the fabric guide surface. I'm trying to send them to Ochibe.

However, when sewing in this way, if there is a step seam part in the middle of the fabric due to side stitching or front joining, the step seam part will appear in a state that protrudes into the folded part of the fabric, so the step stitch part will be hemmed. When passing through the guide surface of the ruler, it receives pressure from the guide surface, and the fabric at the front and back of the stepped seam part separates from the guide surface.
There is a drawback that the stitching may come off at the front and back of the step stitching part.

Therefore, in order to prevent such unstitching, the applicant disclosed a hem-pulling ruler device shown in Japanese Patent Publication No. 38545/1982 and Japanese Patent Publication No. 74/1983.

That is, a hemming ruler stand having a cloth guide surface and a ruler blade whose tip is arranged opposite to the cloth guiding surface are fixed to the front side of the needle drop part of the sewing machine body in the same manner as a conventional fixed hem drawer ruler. At the same time, an auxiliary ruler body having an auxiliary fabric guide surface that is continuous with the guide surface of the hem-pulling ruler table is movably arranged in a position adjacent to the needle drop side of the hem-pulling ruler table. When the stepped seam detection mechanism provided on the front side of this auxiliary ruler body detects the stepped seam part of the fabric, only the auxiliary ruler body is moved back by an amount corresponding to the bulk of the stepped seam part, and the fabric is In order to prevent the fabric from escaping from the needle drop part due to the stepped stitching part, in other words, when the stepped stitching part passes through the auxiliary fabric guiding surface of the auxiliary ruler body, it is pushed back against the auxiliary fabric guiding surface, and the fabric is moved away from the auxiliary ruler. The guide surface of the fixed hem-pulling ruler stand and the tip of the fixed ruler blade so as not to move toward the body side, and the auxiliary cloth guide surface of the auxiliary ruler body that guides the step sewing part at the moved position. By advancing the fabric in a straight line in the same way as when feeding fabric without a stepped seam part, it is possible to sew with a constant seam allowance depth at both the front and rear of the stepped seam part, thereby preventing the sewing from coming off. This is what I did.

Therefore, if you use such a hem ruler device, you will not only be able to sew fabrics with stepped seams without any unstitched stitches, but you will also be able to use the seam allowances at the front and rear of the stepped seams on fabrics without stepped seams. As in the case of sewing, it was possible to maintain a constant depth, which was extremely useful in improving the quality of the sewing.

However, as a result of subsequent experiments, the materials to be sewn, especially thick and highly elastic pile fabrics used for gowns, sweatshirts, etc., were found to be difficult to sew even though the auxiliary ruler body was set back a certain distance. Due to the nature of the fabric, there were cases where stitches came off at the stepped seams, especially at the front.

(C) Purpose of the invention The present invention has been made with attention to the above-mentioned circumstances, and when using the aforementioned hem-pulling ruler device equipped with an auxiliary ruler body that can move forward and backward, it is possible to use a hem-pulling ruler device that is thick and highly elastic. To provide a hem puller ruler device for a sewing machine that does not cause unstitching at the front and back of a step seam part even when fabric is sewn.

(d) Structure of the invention In order to achieve the above object, the present invention is characterized by the following structure.

That is, the present invention includes a hem-pulling ruler stand having a fixed cloth guide surface, and a ruler blade bent in a U-shape and having its tip facing the cloth guide surface of the hem-pulling ruler table in front of the needle drop part of the sewing machine body. In the hem-pulling ruler device of a sewing machine, which is arranged on the side and guides the folded part of the folded edge of the fabric along the cloth feeding direction to the needle drop part, the needle drop of the hem-pulling ruler stand is An auxiliary ruler body having an auxiliary cloth guide surface on the side thereof is provided, and a tip portion thereof is bent in a U-shape at a predetermined distance from the auxiliary cloth guide surface of the auxiliary ruler body on the needle drop side of the ruler blade. A driving mechanism is provided for moving the auxiliary ruler body and the auxiliary ruler blades forward and backward in synchronization in a direction perpendicular to the cloth feeding direction, and a drive mechanism is provided that can protrude and retract into the cloth guide surface. A control circuit that includes a detector and an electromagnetic element that detects movement of the detector and controls the drive mechanism is provided with a step detection mechanism that sends a signal based on the movement of the detector,
At normal times, the outside of the folded part of the fabric edge folded along the fabric feeding direction is guided by the fabric guide surface of the hem pulling ruler stand and the auxiliary fabric guide surface of the auxiliary ruler body, and the inside of the folded part is guided by the tip of the ruler blade, and when the detector of the step detecting mechanism detects a step of the cloth, a drive mechanism controlled by a control circuit activated by the signal causes the step to be guided by the tip of the ruler blade. While passing through the auxiliary cloth guide surface of the ruler body, move the auxiliary ruler blade and the auxiliary ruler body toward the auxiliary ruler body side, and guide the outside of the bending part with the cloth guide surface of the hem pulling ruler stand, The tip of the stepped seam portion is guided by the auxiliary cloth guide surface of the auxiliary ruler body, and the inside of the folded portion is guided by the tip of the ruler blade and the tip of the auxiliary ruler blade. It is something.

Therefore, even if the fabric is thick and highly elastic, when the stepped seam portion passes through the auxiliary fabric guide surface,
Since the fabric at the front and rear of the stepped sewing part is forcibly guided toward the auxiliary fabric guide surface side by the auxiliary ruler blade, there is no risk that the fabric will come off the needle drop and the stitches will come off.

(E) Embodiment Hereinafter, one embodiment of the present invention will be specifically described with reference to the drawings.

Fig. 1 shows a state in which a hem ruler device 1 based on the present invention is attached to a sewing machine body 2, and a bracket 4 is individually attached to the right side of a needle drop 3 of the sewing machine body 2 through screws 5, 5. One end of the position adjustment table 7 of the hem puller ruler device 1 unitized at one end of this bracket 4 is pivoted via a hinge screw 6 so that it can be rotated toward the front as shown in FIG. I'm wearing it.

In addition, a locking spring plate 8 bent in a substantially U-shape is attached to the bracket 4, and this spring plate 8
By fitting the tip of a screw 9, which is removably screwed into the lower surface of the position adjustment table 7, into the fitting hole 8a provided at the tip of the position adjustment table 7, the rotation of the position adjustment table 7 is normally prevented. I make it possible to lock it.

The position adjustment table 7 supports the position adjustment shaft 10 in a horizontally slidable manner, and rotates the position adjustment shaft 10 in the horizontal direction by rotating an adjustment screw 11 screwed onto one end of the position adjustment shaft 10. It is possible to make fine adjustments.

Further, the position adjustment shaft 10 is immovably fixed by a lock screw 12 screwed onto the position adjustment table 7, and the horizontal position of the position adjustment shaft 10 is set by the adjustment screw 11. Afterwards, it is fixed with a lock screw 12. 13 is position adjustment axis 1
0, and by engaging a pin 15 protruding from the position adjustment table 7 into an engagement groove 14 provided at the tip thereof, the position adjustment shaft 1 can be rotated.
0's rotation is prevented.

Also, a solenoid mounting plate 17 holding a rotary solenoid 16, which will be described later, is mounted on the position adjustment shaft 10.
are fixed via screws 18, 18.

By the way, at the needle drop side end of the position adjustment shaft 10,
A hem drawing ruler stand 20 having a fixed cloth guide surface 19 integrally formed at its tip end is fitted and fixed via screws 21, 21. Further, a U-shaped bent ruler blade 22 made of sheet metal is fixed to the upper surface of this hem-pulling ruler stand 20 via a screw 23 so as to be adjustable in the left and right direction, and its tip is used as a fixed cloth guide of the hem-pulling ruler stand 20. The surfaces 19 are opposed to each other with a predetermined gap. Also, the ruler blade 22 is rotatable upward by a hinge 24 provided in the middle of the ruler blade 22, and when setting the fabric, the ruler blade 22 is flipped upward and the fabric is folded back into the ruler. It is inserted into the blade 22. Reference numeral 25 denotes a stopper for setting the stop position of the ruler blade 22 when it is raised, and is fixed to the upper surface of the hemming ruler stand 20 via a screw 26.

In addition, as shown in Figures 4 to 6, the hem-pulling ruler stand 2
An auxiliary ruler body 27 is provided adjacent to the needle drop part 3 side of 0. This auxiliary ruler body 27 is slidably fitted into a sliding groove 30 carved on the inner surface of a guide plate 29 which is fixed via side screws 28, 28 on the side of the needle drop part 3 of the hem drawing ruler stand 20. It is held so that it can move forward and backward in a direction perpendicular to the cloth feeding direction α.

Further, this auxiliary ruler body 27 is always elastically biased in the forward (leftward) direction by a torsion coil spring 34 that is secured at one end to a screw 33 that is screwed into the bottom of the hemming ruler stand 20. The other end of the torsion coil spring 34 is locked in a locking groove 35 provided in the auxiliary ruler body 27.

Furthermore, this auxiliary ruler body 27 is driven backward by the aforementioned rotary solenoid 16, and as shown in FIGS. 4 and 7, a drive lever 36 is attached to the drive shaft 16a of the rotary solenoid 16. A connecting link 37 is interposed between the tip of the drive lever 36 and the block 32 of the auxiliary ruler body 27 to connect them to each other.

A pair of adjustment screws 38 and 39 screwed onto the solenoid mounting plate 17 come into contact with the side surface of the drive lever 36 to regulate the amount of rotation of the drive lever 36, thereby adjusting the forward and backward positions of the auxiliary ruler body 27. The position can be adjusted by these adjusting screws 38 and 39.

Further, a fitting groove 40 is provided at the upper end of the block 32, and the base end of an auxiliary ruler blade 41 is fitted into the fitting groove 40, and is fixed via a screw 42 so as to be adjustable in the left and right directions.

This auxiliary ruler blade 41 is made of a sheet metal bent into a U-shape like the ruler blade 22, and is installed parallel to the needle drop portion 3 side of the ruler blade 22, and its tip 41a is connected to the auxiliary ruler body 22. Auxiliary cloth guide surface 31
are opposed to each other with a predetermined gap between them. It is desirable to adjust this gap depending on the thickness, type, properties, etc. of the fabric.

Further, this auxiliary ruler blade 41 also has the same function as the ruler blade 22.
Similarly, the other end of a round shaft 44, which is rotatable upward via a hinge 43 provided midway and has one end fixed to the upper surface of this auxiliary ruler blade 41, is connected to the upper surface of the ruler blade 22 and this The ruler blade 22 is inserted into a slit-shaped engagement hole 46 formed by a locking metal fitting 45 having a U-shaped cross section fixed to the upper surface.
When the blade jumps up, it rotates in conjunction with the ruler blade 22.

By the way, the fixed cloth guide surface 1 of the hem drawing ruler stand 20
As shown in FIG. 8, a detector 47 for detecting stepped seams of the cloth is attached to one end of an actuating rod 48 that slides through the hem ruler stand 20, as shown in FIG. It is set up so that it can be lost at will.

At the other end of the actuating rod 48, a magnet 49 is attached to a holder 50, as shown in FIGS.
The movement of the magnet 49 accompanying the detection operation of the detector 47 is controlled by the magnet 4
Detection is performed by a Hall element 51 disposed close to and facing 9.

A stopper 52 is fitted onto the actuating rod 48, and is fixed to an appropriate position of the actuating rod 48 via a screw 53 to restrict the amount of protrusion of the detector 47. A coil spring 54 is wound around the actuating rod 48 and interposed between the stopper 52 and the support wall 55 of the hem-pulling ruler stand 20, and elastically deflects the detector 47 in the projecting direction. .

Further, the position of the Hall element 51 can be finely adjusted in the vertical and horizontal directions by a fine movement mechanism 56 disposed on the hem ruler stand 20. The plate 57 can be moved by rotating two screws 58 and 59 provided in the fine movement mechanism 56. Note that a detailed explanation of the fine movement mechanism 56 will be omitted.

The control circuit used in the hem ruler device of this embodiment is, for example, as shown in FIG. 8 of the aforementioned Japanese Patent Publication No. 56-74.

In other words, as a means of detecting the needle movement speed of the sewing machine, a magnetic piece is embedded in the sewing machine pulley, and the passage of this magnetic piece is detected by a Hall element without contact, thereby generating a pulse signal proportional to the needle movement speed of the sewing machine. A rotating pulse generator is provided, and the pulse signals outputted from the pulse generator are counted by two counters, that is, a front-stage counter circuit and a rear-stage counter circuit.

In the front stage counter circuit, the step sewing part of the fabric is the detector 47.
The period from the time when the Hall element 51 detects the retreat of the magnet 49 when it comes into contact with the material to the counter circuit of the previous stage, that is, the time from when the step sewing part reaches the auxiliary cloth guide surface 31 of the auxiliary ruler body 27. It measures and outputs an excitation signal to the rotary solenoid 16.

On the other hand, the latter stage counter circuit is preset in the latter stage counter circuit from the time when the stepped sewing part of the fabric passes the detector 47 and the Hall element 51 detects the forward motion of the magnet when the detector 47 returns. The excitation state of the rotary solenoid 16 is released by measuring the period during which the stepped stitch portion finishes passing through the auxiliary cloth guide surface 31 of the auxiliary ruler body 27.

With such a configuration, the edge of the fabric C is bent into an S-shape, and the lower bent part
By inserting C ₁ into the ruler blade 22 and the auxiliary ruler blade 41 and feeding it between the hemming ruler stand 20 and the ruler blade 22 as shown in FIG.
At the time when the stepped seam portion C ₂ that appears in a protruding state on C ₁ reaches the auxiliary cloth guide surface 31 of the auxiliary ruler body 27,
As shown in FIG. 10, the auxiliary ruler body 27
Moves backward to the right by an amount corresponding to the bulk of C ₂ .
Therefore, the auxiliary cloth guide surface 31 of the auxiliary ruler body 27
comes to guide the tip of the stepped seam portion _C2 without contacting the outside of _the lower bent portion C1.

At the same time as the auxiliary ruler body 27 moves backward, the auxiliary ruler blade 41 is also driven by the rotary solenoid 16 to move to the right, so that the lower folded portion of the fabric C is
_C1 is pressed by the tip 41a of the auxiliary ruler blade 41 and is forcibly brought toward the auxiliary ruler body 27. Therefore, even if the fabric is a thick and highly elastic pile fabric, the lower folded portion _C1 is guided toward the needle drop portion 3 at the correct position, and there is no risk of the stitching coming off.

Further, in this embodiment, the auxiliary ruler blade 41 is connected to the round shaft 4.
Since it is connected to the ruler blade 22 via 4,
When setting the fabric, the auxiliary ruler blade 41 can be flipped up together with the ruler blade 22.

(F) Effect of the invention As is clear from the above explanation, according to the hem ruler device for a sewing machine according to the present invention, the folded part of the fabric is always connected to the fixed cloth guide surface of the hem ruler stand and the ruler blade. In addition to being guided by the tip of the auxiliary ruler blade, it is normally guided by the auxiliary fabric guide surface of the auxiliary ruler body, but when the stepped stitch portion passes through the auxiliary guide surface, it is guided by the tip of the auxiliary ruler blade. You will be guided. Therefore, by setting the distance between the tip of the auxiliary ruler blade and the auxiliary cloth guide surface of the auxiliary ruler body to an appropriate predetermined distance determined by the fabric of the cloth, etc., it is possible to perform sewing without unsewn stitches regardless of the presence of the stepped seam part. This has the effect of being able to perform the following.

[Brief explanation of drawings]

Figures 1 to 10 show one embodiment of the present invention; Figure 1 is a perspective view showing the sewing machine installed on the sewing machine body, Figure 2 is a perspective view showing the mounting structure for the bracket, and Figure 3 is a perspective view showing the attachment structure to the bracket. is a perspective view showing the state of use, FIG. 4 is a perspective view showing the mounting structure of the auxiliary ruler body and the auxiliary ruler blade, FIG. 5 is an exploded perspective view of the auxiliary ruler body and the auxiliary ruler blade, and FIG. 6 is a top view. FIG. 7 is a side view as seen from the needle drop side, FIG. 8 is a perspective view showing the stepped seam portion detection mechanism, and FIGS. 9 and 10 are operation explanatory views, respectively. 1... Hemming ruler device, 2... Sewing machine body, 3...
...Needle drop portion, 16... Drive mechanism (rotary solenoid), 19... Fabric guide surface, 20... Hemming ruler stand,
22... Ruler blade, 27... Auxiliary ruler body, 31...
... Auxiliary cloth guide surface, 41 ... Auxiliary ruler blade, 47,
48, 49, 51...Step seam portion detection mechanism.

Claims (1)

[Scope of Claim for Utility Model Registration] A hemming ruler stand having a fixed fabric guide surface and a ruler blade bent in a U-shape and having its tip facing the fabric guide surface of the hemming ruler stand are connected to the needle drop part of the sewing machine body. In a hem-pulling ruler device for a sewing machine, the hem-pulling ruler device is disposed on the front side of the hem-pulling ruler stand and guides the folded part of the folded edge of the fabric along the fabric feeding direction to the needle drop point. An auxiliary ruler body having an auxiliary cloth guide surface on the needle drop side is provided, and the ruler blade is bent in a U-shape on the needle drop side, and its tip portion is set on the auxiliary cloth guide surface of the auxiliary ruler body. auxiliary ruler blades are arranged to face each other while maintaining a gap of a step detection mechanism that sends a signal based on the movement of the sensor to a control circuit that controls the drive mechanism, the control circuit comprising a sensor that can move and an electromagnetic element that detects the movement of the sensor; , the outside of the folded portion of the edge of the fabric folded along the cloth feeding direction is guided by the cloth guide surface of the hem pulling ruler stand and the auxiliary cloth guide surface of the auxiliary ruler body, and the inside of the folded portion is guided by the ruler. When the detector of the step detecting mechanism detects a step of the cloth, a drive mechanism controlled by a control circuit activated by the signal causes the step of the step to be guided by the tip of the blade, and when the step detecting mechanism detects the step of the cloth, the step is guided by the step of the auxiliary ruler. While passing through the auxiliary cloth guide surface, the auxiliary ruler blade and the auxiliary ruler body are moved toward the auxiliary ruler body side, and the outside of the folded portion is guided by the cloth guide surface of the hem pulling ruler stand, and the step sewing portion The sewing machine is characterized in that the tip of the sewing machine is guided by the auxiliary fabric guide surface of the auxiliary ruler body, and the inside of the folded part is guided by the tip of the ruler blade and the tip of the auxiliary ruler blade. Hemming ruler device.