UA28292U - Method to make shuttle stitch - Google Patents

Abstract

A method to make shuttle stitch at which at side of short groove in needle eye a hanging loop of upper thread is formed, shuttle pusher with its horn presses the shuttle that catches the loop, displaces it in a gap formed between the horn of the pusher and the shuttle. As result of first working stroke the loop is placed with shuttle for temporary keeping to groove of the inner shuttle and at second working stroke at common motion of inner and outer shuttles the shuttle pushers with their horns press the shuttles, tips of which catch the hanging loop of upper thread that is repetitively formed at side of short groove in the needle eye, and pass it round the thread that is temporarily kept in the groove of the inner shuttle.

Description

Description of the invention

The useful model refers to sewing machine engineering, namely to machines that perform a shuttle 2 stitch. The purpose of the useful model is to increase labor productivity by refusing to change spools with thread of a limited length, actually switching to the formation of a single-thread shuttle stitch, as well as maintaining the strength of the threads due to the reduction of the size of the shuttle.

There is a known method of performing a shuttle stitch with a rotary shuttle |1), in which a needle with a thread pierces the materials, passes the upper thread through them and lowers to the lowest position, when the needle is lifted from the 710th lowest position by 1.5...2 mm, a loop is formed, which captures the nose of the shuttle, the shuttle, having captured the loop of the upper thread, expands it, the loop of the upper thread is circled by the shuttle around the bobbin, when the loop of the upper thread will be circled around the bobbin at an angle greater than 1802, the thread puller, rising up, tightens the stitch, the rail moves the materials to the length of the stitch , the shuttle is idling. The main disadvantage of the method is the limited length of the thread on the spool, which requires frequent changes and a decrease in labor productivity. 15 disadvantages include the need for a significant expansion of the loop of the upper thread, which determines the need for it to pass through the tension system multiple times and, accordingly, reduce its strength.

The closest analogue to the proposed method (prototype) is the method of forming a stitch using a swinging shuttle |21.

With this method, the needle, descending to the lowest position, passes the upper thread through the materials 20 that are sharpened. The nose of the shuttle is at this time in the extreme left position at a distance of 3.5-4 mm from the axis of the needle.

Then the needle rises from its lower position by 2.5 mm. On the side of the short groove at the eye of the needle, a loop is formed from the upper thread of sufficient width (1.5-2 mm). The largest width of the loop will be formed at a distance of 1.5-2 mm above the ear. In order for the nose of the shuttle at this moment to enter the loop, the eye of the needle must be located below the nose of the shuttle by 1.5-2 mm. 25 The nose of the shuttle, which has the shape of a wedge, passes near the needle. 8

The pusher of the shuttle presses with his horn on the heel of the shuttle, turning it clockwise. Between the second horn of the pusher and the nozzle of the shuttle at this time, a gap will be formed for the free passage of the loop.

Then the shuttle continues its work. Its nose and strap fit into the guide groove of the shuttle body.

The base of the nose of the shuttle, moving the loop, transfers its branches to the side conical surfaces of the shuttle. ch 30 During further movement of the shuttle in the same direction, the base of its nozzle moves the loop to the surface of the spool cap (from the front side) and the rear wall of the shuttle.

The loop from under the nose of the shuttle goes to the wing. The shuttle enters the loop with its entire hull. high school

The base of the nose of the shuttle leads the loop a little further than the vertical. At this moment, the eye of the lever of the thread puller rises and drops the loop from the shuttle.

Z The pusher of the shuttle stops its clockwise motion and begins to reverse. This c leads to the fact that the horn of the shuttle pusher now becomes the driver and presses on the base of the shuttle spout. The shuttle begins its idling. At this time, the loop is almost already circled around the bobbin cap with the bobbin.

Between the heel of the shuttle and the horn of the pusher of the shuttle, a gap will be formed, which is necessary for the exit of the dropped loop from the shuttle device. WITH

The thread taker then quickly pulls the loop out of the shuttle. The loop, inside which the lower thread is now located, exits through the gap between the horn and the heel of the shuttle. The shuttle, turning counter-clockwise, approaches the left wall of the window in the hull of the shuttle with its heel.

Next, the thread puller tightens the loop, pulls the lower thread into the material and winds the thread from the spool to the length that was spent on the stitch. The rail moves the material to form the next stitch.

The disadvantages of this method are the limitation of the length of the bobbin thread, which requires a periodic change of the spool and a decrease in the strength of the upper thread due to the large size of the spool. (os The basis of a useful model is the task of improving the method for forming a shuttle stitch with a wobbly shuttle, due to the elimination of the bobbin with a bobbin cap and replacing them with an additional shuttle, which eliminates the need to change them, reduces the drop in the strength of the upper thread, due to which it increases (Se) 50 work productivity and the strength of the shuttle stitch increases.

The task is solved by the fact that in the claimed method, as a result of the first working stroke, the outer shuttle loop is placed for temporary storage in the groove of the inner shuttle, and during the second working stroke, with the simultaneous movement of the inner and outer shuttles, the pushers of the shuttles press with their horns on the shuttles, the noses of which are captured loop-overhead from the upper thread, which is repeatedly formed on the side of the 99 short groove in the eye of the needle and circle it around the thread, which is temporarily stored in the groove of the inner shuttle.

The essence of the method is explained by graphic images, which show the order of stitch formation.

Fig. 1 shows the needle 1, the material to be processed 2, the outer shuttle 3, the spout of the outer shuttle 4, the shank of the outer shuttle 5, the base of the shank of the outer shuttle b, the pusher of the outer shuttle 7, 60 horns of the pusher of the outer shuttle 8, the inner shuttle 9, nose of the inner shuttle 10, shank of the inner shuttle 11, base of the shank of the inner shuttle 12, pusher of the inner shuttle 13, horns of the pusher of the inner shuttle 14.

Needle 1, descending to the lowest position, passes the upper thread through material 2 (Fig. 1). The shank of the outer shuttle 5 is at this time in the extreme left position at a distance of 3.5-4 mm from the axis of the needle. because Fig. 2 shows how the needle 1 rises from its lower position by 2.5 mm. On the side of the short groove at the eye of the needle, a loop is formed from the upper thread of sufficient width (1.5-2 mm). The shaft of the outer shuttle 5, which has the shape of a wedge, passes near the needle.

Fig. 3 shows how the pusher of the outer shuttle 7 with its horn 8 presses on the nozzle of the shuttle 4, turning it clockwise. Between the second horn of the pusher and the shank of the shuttle 5 at this time, a gap will be formed for the free passage of the loop.

In Fig. 4, the outer shuttle Z continues the first working stroke. The base of the shank of the outer shuttle 6, moving the loop, transfers one of its branches to the side surface of the shuttle, the second branch is placed in the groove of the inner shuttle, which is still stationary. 70 During further movement of the shuttle in the same direction (Fig. 5), the base of its shank lays the thread on the surface of the groove of the inner shuttle. The free branch of the upper thread is completely pulled through the material and temporarily held in the groove of the inner shuttle.

The pusher of the outer shuttle 7 stops its clockwise movement and begins to turn in the opposite direction. The inner shuttle pusher 13 is driven in the same direction. This leads to the fact that the horns of the pushers 8, 14 shuttles now press on the bases 6, 12 of the shanks of the shuttles. Shuttles Z, 9 start the second working shift. At the same time, the needle rises from its lower position by 2.5 mm. From the side of the short groove at the eye of the needle, a loop is formed from the upper thread of sufficient width (1.5-2 mm) (Fig.b).

The nozzles of the shuttles 4, 10 pass near the needle (Fig. 7). Pushers of the shuttles 7, 13 with their horns 8, 14 press on the bases of the shanks of the shuttles. At this time, a gap of 2° will be formed between the second horns of the pushers and the nozzles of the shuttles for the free passage of the loop. AND

Then the shuttles continue the second working course. THEIR nozzles 4, 10 enter the guide grooves of the shuttle housing. The nose of the shuttle transfers the branches of the needle loop to the side conical surfaces of the shuttle (Fig. 8).

Shuttles 3, 9 are completely included in the loop, their shanks 5, 11 go a little further than the vertical (Fig. 9).

Shuttle pushers 7, 13 stop their second working movement and begin to turn in the opposite direction. This leads to the fact that the horns of the pushers press on the bases of the nozzles of the shuttles. Shuttles 3, 9 begin their idling. At this time, the loop is already encircled around the thread, which was temporarily held in the groove of the inner eye of the shuttle 9. Between the shanks of the shuttles 5, 11 and the horns of the pushers of the shuttles, a gap will be formed, which is necessary for the exit of the dropped loop from the shuttle device (Fig. 10). At this moment, the thread puller rises and drops the loop from shuttles Z, 9. Then the thread puller quickly removes the loop from the shuttle device. The loop, inside which is now the lower thread, which was temporarily held by the inner shuttle 9, exits through the gap between the horns of the pushers and the shanks of the shuttles 5, 11. Me)

Shuttles 3, 9 create their idling speed (Fig. 11). with

Next, the thread puller tightens the loop, pulls the lower thread into the material and winds the thread from the spool to the length that was spent on the stitch. The material is moved to form the next stitch. Needle 1 so

Зз5 descends to the lower position, shuttles З, 9 complete the idle stroke and become in the initial position for the formation of the next stitch (Fig. 12).

The method increases the productivity of the sewing machine, increases the strength of the stitch. The proposed method can be used in sewing machine building. It can become especially relevant in the production and use of short-seam sewing machines - semi-automatic and automatic machines. "

Sources of information from p. 1. Franz V.Ya. Sewing production equipment. M.: Publishing center "Akademiya". - 2002. - 448bs. 2. Ermakov A.S. Equipment of sewing enterprises - M.: Profobrizdat. - 2002. - 4326.

Claims (1)

;" The formula of the invention is) The method of performing a shuttle stitch, in which a loop is formed from the upper thread on the side of the short groove in the eye of the needle. which differs in that as a result 5r of the first working stroke, the loop is laid by the shuttle for temporary storage in the groove of the inner shuttle and during the second working stroke, with the simultaneous movement of the inner and outer shuttles, the pushers of the shuttles press with their HC horns on the shuttles, the noses of which capture the loop-overhead from the upper thread, which is formed again from the side of the short groove in the eye of the needle, and circle it around the thread temporarily stored in the groove of the inner shuttle. p. 60 b5