JPS6110628Y2 - - Google Patents

Description

[Detailed Description of the Invention] The invention of this application relates to a thread rewinding device for a sewing machine.

In conventional sewing machine thread rewinding devices, the thread rewinding bobbin is rotatably attached to a bobbin holding member, and the thread is hung downward via a sewing thread guide rod separately arranged above the holding member. The sewing thread wound around the sewing thread is passed through the guide hole of the guide rod and guided to the sewing machine head. This sewing thread rewinding device is a system that pulls the sewing thread up to the guide bar and lets it hang down again, and then pays out the sewing thread from the spool. Therefore, when the sewing machine is suddenly stopped while in use, bobbin overrun may occur, causing the sewing thread to drop. Due to excessive unwinding, the sewing thread often cannot be unrolled smoothly, resulting in defects such as problems during fabric sewing work.

In another known example, a wire is bent into an inverted V shape, one of which is used as a pivot leg, the other is used as a swinging body, and a guide tool is formed with a thread guide ring at the tip. Insert the bobbin, which is fitted into the spindle with the pivot leg set upright on the sewing machine arm, into the gap between the spindles.
There is a device that is supported in contact with the hole edge of the bobbin (Japanese Utility Model Publication No. 10546/1983). Although this configuration is simple, since the pivot leg of the guide tool is inserted into the gap between the bobbin and the support shaft to support the guide tool, the pivot leg of the guide tool is inserted into the gap between the bobbin and the spindle while the bobbin is rotating to feed the sewing thread from the bobbin. In particular, if the pivot leg of the guide tool bends while the sewing machine is rotating, problems may occur in the rotation of the bobbin. ) as sewing thread on a high-speed sewing machine, the shaft leg of the guide tool inserted into the gap between the bobbin and the spindle may bend, causing problems such as the bobbin not being able to rotate. There were problems such as the inability to supply supplies to

The rewinding device according to the invention of the present application eliminates the above-mentioned defects, and aims to provide a structure that smoothly unwinds the sewing thread from the side of the spool in a substantially horizontal direction, and its outline is as follows. be.

A spool holder a rotatably supports a bobbin on which sewing thread is wound in a cylindrical shape, a spool presser b controls the rotation with its arm when the sewing machine stops operating, and the spool spooler b moves in one direction. The bobbin spool presser adjuster c is engaged with the spool presser b at its end, and works together with the spool presser to regulate the rotation of the bobbin to which the cylindrical spool is attached. To provide a sewing thread rewinding device for a sewing machine having a guide part d for guiding a cylindrical thread wound around a bobbin to a sewing thread guide.

That is, in the device of the present invention, the sewing thread is pulled out from the rotating bobbin, and during sewing, the guide portion d is pulled close to the bobbin by the sewing thread, so that the thread winding presser b is placed in a position away from the bobbin. However, when the operation of the sewing machine is suddenly stopped, contrary to the above, the guide part d moves away from the bobbin, and instead, the thread winding presser b comes into contact with the bobbin and plays the role of a brake to stop the bobbin from overrunning. . Therefore, while the bobbin is rotating, the sewing thread is smoothly unwound from the cylindrical thread winder, and a smooth sewing operation can be performed.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

The invention of the present application can be broadly divided into a thread winding stand a, a thread winding presser b, a thread winding presser adjuster c, a thread guide d, and a stand e.

The thread winding stand a has a rod 9 that is screwed 4 to the holding plate 2 of the stand e equipped with an upright rod 50,
A rotatable cylindrical tube 8 is provided around a rod 9 via a bearing 6. A bobbin 11 in which a sewing thread (described later) is wound into a cylindrical shape 42 is inserted into the cylindrical tube 8.
A nut 12 provided with leg portions 14 is screwed onto the upper end of the rod-shaped body 10 of the bobbin winding presser adjuster c, which is erected on the holding plate 2 of the stand e. A coil spring 20 is wound around the outer circumference of the upper end of the rod-shaped body 10, and the end thereof is
By manipulating the nut 14 formed on the L-shaped presser foot 18 and provided at the end of the rod-shaped body, the pressing force on the coil spring 20 is adjusted and pressed against the arm portion 16 of the thread winding presser b of the L-shaped presser foot 18. The rotation of the thread winding presser b in one direction is restricted by adjusting the pressure. Wire rods 21 and 23 forming the arm portion 16 of the thread winding presser b
Each end is rotatably wound around the rod-shaped body 10, and the other end consists of a portion 22 curved in the direction of the cylindrical spool 42 so as to embrace the cylindrical spool 42, which will be described later. Next, the thread guide d consists of two parallel wire rods 24 and 26, one end of the wire 24 is wound around the rod-shaped body 10 to form an upwardly curved L-shape 28, and one end of the wire 26 is bent downward. A curved L-shape 30 is formed.

The L-shaped members 28 and 30 respectively engage the wire rods 21 and 23 of the arm portion 16 of the thread winding presser b from the inside thereof, and when rotating about the rod-shaped body 10 together with the wire rods 24 and 26 of the thread guide d. , the arm portion 16 of the thread winding presser b engaged with these L-shaped members
The wire rods 21 and 23 also rotate in the same direction. A thread guide hole 32 is formed at the tip of the thread guide d.
Portions of the wire rods 24 and 26 of the thread guide d close to the guide hole 32 are bent 27. Further, an elastic member 34 is fitted into the guide hole 32.

The sewing thread 44 pulled out from the cylindrical spool 42 wound around the bobbin 11 responds to the rotation of the bobbin 11.
The thread guide 52 of the sewing machine passes through the thread guide hole 32,
54. The arm of the spool presser b is attached to the outer side of the cylindrical spool 42 wound around the bobbin 11 mounted on the rotatable cylindrical tube 8 which is erected on the support plate 2 horizontally supported on the stand 50, with an appropriate gap. Curved portion 22 of section 16 and parallel wire rod 2 of thread guide d
4 and 26 are arranged.

Reference numeral 36 is a washer fitted to the rod-shaped body 10 in contact with the L-shaped presser foot 18 at the lower end of the coil spring 20 of the bobbin winding presser adjuster c, and numeral 38 is a washer fitted onto the rod-shaped body 10 in contact with the wire 26 of the thread guide d. This is another washer that is fitted onto the rod-shaped body 10 so as to be in contact with the upper end of the rod.

As already explained, the bobbin 11 on which the sewing thread is wound in a cylindrical shape is fitted onto the rotatable cylindrical tube 8, and one sewing thread 44 is pulled out through the guide hole 32 and guided to the thread guide of the sewing machine.

FIG. 8 shows the arrangement of the apparatus and sewing machine of the present application. In front of the sewing machine head 48 disposed on the table 41, a thread winding stand a, a thread winding presser, a thread winding presser adjuster c, and a thread guide d are attached to a holding plate 2 provided on a stand 50. The sewing thread 44 (needle thread) pulled out from the cylindrical thread spool 42 wound around the bobbin 11 by the operation of the sewing machine passes through the guide hole 32 of the thread guide d, and passes through the thread guides 52 and 5 of the sewing machine.
4 and is inserted into a sewing machine needle 56 to form a seam (for example, a lock stitch) on the fabric in cooperation with a bobbin thread (not shown). While the sewing machine is operating at high speed and stitches are being formed, the parallel wire rods 2 of thread guide d
Since the sewing thread 44 is quickly pulled out from the holes 32 provided at the ends of the threads 4 and 26, the bobbin 11 with the cylindrical spool 42 rotates together with the cylindrical tube 8 in a predetermined direction, and the sewing thread is rewound. . During operation of the sewing machine, the bobbin 11 rotates, and the parallel wire rods 23, 2 of the thread guide d
4 is located close to the cylindrical spool 42, and its bent portion 27 comes into contact with the cylindrical spool 42, so that the sewing thread is smoothly pulled out from the thread guide hole 32.
On the other hand, the arm portion 16 of the spool presser b is moved in a direction away from the cylindrical spool 42 via the pair of L-shaped wires 26 and 28 of the thread guide d.

If the sewing machine suddenly stops working, the tension of the sewing thread 44 against the guide holes 32 provided at the ends of the parallel wire rods 24 and 26 of the thread guide d will suddenly loosen, causing the cylindrical shape wound around the bobbin 11 to Thread winder 4
Together with the bobbin 11, a force acts on the bobbin 2 due to inertia to continue rotating in the direction in which it has been rotating.
However, the sewing machine suddenly stopped working and thread 1
When the tension caused by thread guide d is loosened, wire rod 2 of thread guide d
4 and 26 move in a direction away from the cylindrical spool 42 (towards FIG. 1), correspondingly, the arm portion 16 of the spool presser b moves in the direction of the cylindrical spool 42 in the opposite direction to the thread guide d. Since the arm portion 16 approaches the tubular bobbin spool 42 with its curved portion 22, the arm portion 16 acts as a brake on the bobbin 11, thereby preventing unnecessary rotation of the bobbin 11. Therefore, overrun of the yarn rewinding device can be prevented. In this manner, the thread winding presser b and the thread guide d work together to prevent the cylindrical thread 42 wound around the bobbin 11 from overrunning.

The present invention prevents overrun rotation of the bobbin equipped with a tubular thread winder and enables smooth seam formation even when sewing with thick thread on a high-speed sewing machine. , it has the effect of helping to improve the efficiency of sewing work.

FIG. 9 shows another embodiment, in which the rotating action of the spool 42 can be adjusted more effectively by attaching an elastic material 58 or the like to the inside of the curved portion 22 of the wire rods 21, 23 of the spool presser b. can do.

[Brief explanation of the drawing]

The attached drawings show an embodiment of the device according to the present invention. Fig. 1 is a perspective view, Fig. 2 is a side view of the cylindrical tube of the thread winder stand, Fig. 3 is a side view of the thread winder presser adjuster, Fig. 4 is a side view of the thread winder presser, and Fig. 5 is a side view of the thread guide. 6 is a side view of the lower end of the rod-shaped body and the stand plate, FIG. 7 is a longitudinal cross-sectional view of the thread stand cylindrical tube, and FIG. 8 is the arrangement of the device and sewing machine according to the invention of the present application. The schematic diagram, FIG. 9, is another embodiment of the thread winding presser. a is a thread winder, b is a thread winder presser, c is a thread winder presser adjuster, d is a thread guide, e is a stand,
10 is a rod-shaped body, 16 is an arm of the thread winding presser, 18
is an L-shaped presser foot, 21 is a wire rod, 22 is a curved part, 23
is a wire rod, 28 is an L-shaped part, 30 is an L-shaped part, 42
is a tubular thread winder, and 44 is a sewing thread.

Claims (1)

[Scope of claims for utility model registration] 1. A stand e with a holding plate provided on the stand,
A thread winding holder a rotatably supports a bobbin on which sewing thread is wound in a cylindrical shape on a cylindrical tube erected on the stand e, and one end is wound around a rod-shaped body erected on a holding plate of the stand e. a spool presser b for controlling the rotation of the bobbin at a part; a spool adjuster c wound around the rod-shaped body to regulate the rotation of the spool presser b in one direction; and an end thereof wound around the rod-shaped body. A sewing thread rewinding device for a sewing machine, comprising a guide portion d that engages with a thread winding presser b and cooperates with the thread winding presser b to restrict rotation of the bobbin. 2. In order to restrict the rotation in one direction of the spool presser b that can contact the cylindrical spool 42 of the bobbin 11 attached to the spool stand a that is set up on the holding plate 2 provided on the stand 50, a bar-shaped The L-shaped presser 18 of the coil spring 20 wound around the body 10 is attached to the wire rods 21 and 2 of the arm portion 16 of the thread winding presser b.
3. A sewing thread rewinding device for a sewing machine according to claim 1, which is capable of being engaged with the sewing machine from one direction. 3 L-shaped portions 2 that can engage the wire ends of the thread guide d wound around the rod-shaped body 10 erected on the holding plate 2 with the arm wires 21 and 23 of the thread winding presser b, respectively.
8.30 A sewing thread rewinding device for a sewing machine according to claim 2 of the utility model registration claim.