JPS5932159B2 - Sewing machine needle drive device in tatami sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel sewing machine needle drive device for a tatami mat sewing machine, and is particularly characterized by two features that make it an effective device when installed in a portable small sewing machine.

Tatami sewing machines include tatami floor frame sewing machines, tatami edge fabric flat stitching machines, and tatami edge fabric backstitching machines.

These various types of tatami sewing machines use sewing machine needles consisting of straight needles or curved needles, and because the tatami floor is thick, the sewing machine needles make linear reciprocating motion or circular arc reciprocating motion with large strokes.

Most conventional needle drive devices have a crank mechanism in order to convert the rotational motion of a drive motor into reciprocating motion of a needle, and a slide metal on which a needle is attached is supported by a slide rod.

In order to absorb this looseness of the slide metal, the slide metal was made long to accommodate the long stroke, and as a result, the device became larger than necessary.

The sewing machine needle drive device of the present invention eliminates the need for an unnecessarily long slide rod by hooking the needle directly onto the reciprocating cheno and causing it to slide.This allows the movement of a long needle with a short device. I was able to do it.

In other words, it is a simple device that consists of two guide plates that are slightly longer than the stroke of the needle, facing each other with a width for sliding between the needle and chain 7, and adding a reciprocating drive device for the chain. It is.

The configuration of this device will be specifically explained below with reference to the drawings.

FIG. 1 is a side view showing the drive load of the straight needle, FIG. 2 is a partially cutaway front view of the same, and FIG. 3 is a partially cutaway enlarged side view of the mounting portion of the straight needle.

FIG. 4 is a front view showing the drive device for the backstitch arc needle.

First, a linear needle drive device for a flat pricking machine, which is a first embodiment, will be explained based on FIGS. 1 to 3.

Although the drawing omits the main body frame, the frame includes a drive motor 1, a worm shaft 2, a worm wheel shaft 3, a fan gear pin 4, chain wheel shafts 5, 6, 7, a needle guide plate 8, and a chain guide plate 9. are placed respectively.

Power is transmitted between the drive motor 1 and the worm shaft 2 by the drive of the belt 10, from the worm shaft 2 to the worm wheel shaft 3 by the worm 11 and the worm wheel 12, and by the crank pin 1 of the worm wheel 12.
3 and the crank pin 15 of the fan gear 14 are connected by a crank rod 16, the fan gear 14 is engaged with the transmission gear 17 of the Cheno wheel shaft 5, the Cheno wheel 18 is reciprocated, and the Cheno wheel 19 is reciprocated.

The straight needle 20 is made to slide in a needle receiver 21 provided on the frame, and the upper end of the base of the straight needle is bent at a right angle to form a chain fitting part 22, and it is fitted between the chain 190 low seam so that there is no play. are combined.

The opposite side of the straight needle fitting part 22 is the needle guide plate 8.
The side surface of the chain fitting portion moves while being supported by the chain rollers fed into the chain guide plate 9.

The installation state of the straight needle by the chain fitting part is shown in FIG. 3, and the straight needle 20 is regulated in all positions even when reciprocating by the needle guide plate 8 and the chain guide plate 9 that slides on the chain guide plate 9. This ensures smooth movement without wobbling.

The linear needle drive device of the flat needle machine has the structure described above.
Other structures are the same as before.

To briefly explain them with reference to FIGS. 1 and 2, the main body of the flat stabbing machine for the tatami floor 23 is
4 and the lower compression plate 25 sandwich the tatami floor, and guide rollers 27 sandwiching the guide rail 26 on the top surface of the tatami floor from both sides.
, 27 serve as movement guides for the main body.

Using the feed cam 28, feed lever 29, and feed rod 30 provided coaxially with the worm wheel shaft 3, the feed fitting 31 is gripped by the guide rail 26, and one of the stitches is
As a guide, lower the feed to the main body and sew.

FIG. 4 is a side view showing a second embodiment, in which a needle drive device of the present invention is installed in a backstitch machine for hem cloth 33 using an arcuate needle 32.

Like the straight needle 20, the arcuate needle 32 requires a long stroke to pass through the thick tatami floor from the bottom to the side, or vice versa.

Therefore, the slide metal that reciprocates the arcuate needle is forced to move over a distance nearly twice the stroke, which increases the size of the device.

The configuration of the present invention can be applied not only to the above-mentioned straight needle but also to an arcuate needle.The arcuate needle 32 is bent at its base to form the chino fitting part 22 in the same way as a linear gauge, and the chino fitting part 22 is used for reciprocating chino. It is directly fitted and supported between the 19 rollers.

That is, as shown in FIG. 4, both the needle guide plate 8 and the chain guide plate 9 are formed into arc shapes, and the chain 19 and the arc needle 32 are supported and regulated by these two guide plates.

However, in this case, since the chain 19 must be supported in an arc shape, it is only necessary to partially provide the arc clamping chain and the tribe chain in duplicate.

For power transmission to the chino 19, a mechanism almost similar to that of the straight needle shown in FIG. 1 can be adopted.

That is, although not shown, a crank 35 is provided on a drive shaft 34 that is appropriately decelerated by a worm and a worm gear.
A fan gear 14 is oscillated by a crank mechanism 16, and a transmission gear 17 is used to rotate a chen wheel 18, giving the chen 19 back and forth reciprocating motion.

As is clear from the above explanation, although the sewing machine needle drive device of the present invention uses a crank mechanism in the middle of power transmission,
Instead of using a conventional structure in which a slide metal is used as the support for the needle and a crank mechanism is used to slide the slide metal back and forth using a long slide rod, the needle itself is directly fitted into the chino that moves back and forth. Because they are clamped together, the length of the guide plate is only the length of the needle stroke, and the device can be made extremely compact.As a result, the sewing machine itself is portable and lightweight, and can be used only for changing the tatami cover. It has become possible to manufacture equipment that can be used on small aircraft and is suitable for traveling to work on-site.

[Brief explanation of drawings]

FIG. 1 is a side view showing a driving device for a straight needle, FIG. 2 is a partially cutaway front view of the same, and FIG. 3 is a partially cutaway enlarged view of the straight needle's attachment portion. FIG. 4 is a front view showing the drive device for the backstitch arc needle. 8...needle guide plate, 9...chain guide plate, 19...cheno, 20...straight needle, 21...needle guard , 22... needle fitting part, 32... circular arc needle.

Claims (1)

[Claims] 1. A chain 7 that is suspended so as to reciprocate along the reciprocating stroke of the sewing machine needle, and a sewing machine needle that fits and supports a chain fitting part formed by bending the base of the sewing machine needle between the rollers of the chain; A needle guide plate and a chain guide plate are provided facing each other with an interval to support these chains 7 and sewing machine needles,
A sewing machine needle drive device for a tatami sewing machine, characterized in that a sewing machine needle is directly reciprocated along a min needle guide plate by a checker 7.