JPS6029183A - Ring stitching apparatus hem stiching sewing machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] Technical Field The present invention is equipped with a so-called hack tuck function that automatically sews a separated empty ring into the beginning of the seam of the fabric when oversewing the edge of the fabric. The present invention relates to an improvement of a hollow ring sewing device, and particularly relates to a hollow ring sewing device adapted to be used in an overlock sewing machine.

PRIOR TECHNOLOGY This type of hollow ring sewing device equipped with a hack tack function is generally used to perform continuous oversewing on sleeves of jackets, etc. The structure is such that the hollow ring formed by the process can be sewn into the beginning of the seam of a new fabric without the need for manual labor. Although it is already known, the device according to this proposal is a device that positions the empty loop to be sewn into the beginning of the seam of the next fabric after separating it from the fabric that has been oversewn. It has the following characteristics.

That is, the hollow ring cutting and positioning device that constitutes the essential part of this proposal comprises a suction tube with a cutting knife supported near the free end of the tongue and an orienting device embodied by a suction tube. A hollow ring cutting device comprising a hollow ring cutting device, a gripping device comprising a gripping plaid and a suction positioning tube, and a groove extending in the throat plate between the tongue of the throat plate and the gripping device. After the ring is sucked into the suction tube and separated from the fabric on which oversewing has been completed, the ring is discharged toward the gripping device by the jet air of the suction tube, and is sucked into the positioning tube of the gripping device. Then, by driving the grip plaid up and down at this time, it is fitted into the above-mentioned groove, and is gripped and positioned by the grip plaid.

However, with this kind of device, the following problems are pointed out in actual operation.

Firstly, when the hollow ring is sewn in, it is inserted into the groove formed on the throat plate and positioned so that it is folded back to the underside of the new fabric. Due to its structure, the concave groove cannot extend to the needle drop position, so it has not been possible to eliminate the friction with the fabric that affects the retention of the empty ring.

For this reason, there was also a limit to workability.

Second, since the hollow ring is placed on the underside of the fabric, it is sewn in without being visible to the operator.

Therefore, it becomes difficult to judge and confirm whether or not the seam formation is appropriate, and there is a problem that defective products such as skipped stitches are likely to occur.

Thirdly, after the empty ring is captured by the suction tube, it is ejected by the jet of the suction tube, received by a gripping device relatively far away, and inserted into the groove of the side plate, so that the holding position of the empty ring is fixed. It becomes unstable and it is difficult to fit it into the groove and properly position it.

Purpose of the invention This invention was made to solve the above problems.
The first object of the present invention is to provide an empty ring sewing device that can be attached to an overlock sewing machine and has an automatic bank tank function that allows the empty ring to be positioned on the upper side of the fabric and sewn into the fabric. purpose.

The second object of this invention is to provide an automatic hack-tack function that creates almost no friction between the hollow ring and the fabric when sewing it in, and thus forms an appropriate hemline seam on the fabric surface. An object of the present invention is to provide an empty ring sewing device.

A third object of the present invention is to provide an empty ring sewing device having an automatic bank tank function that allows an operator to observe the sewing state of the empty ring from the outside.

A fourth object of the present invention is to enable the feed dog slot 7) provided in front of the needle drop of the throat plate to work effectively;
To this end, an object of the present invention is to provide an empty ring sewing device equipped with a bank tank function and with improved work efficiency, allowing the fabric edge to reach the needle drop surface accurately and quickly to perform hack tuck.

Other objects and advantages of the invention will become apparent from the following description of preferred embodiments.

This invention can be applied to a known overlock sewing machine, for example, the first overlock sewing machine.
In addition to a general overlock sewing machine equipped with a feed dog on the throat plate surface as shown in the figure, it can also be applied to an overlock sewing machine equipped with an endless feed heddle as shown in Figure 13. be.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 shows a perspective view of the external configuration of an overlock sewing machine to which the present invention is applied.

Except for the empty ring catcher that constitutes the essential parts of this invention device, the presser foot, the empty ring transfer device, and the empty ring holding mechanism 4 are designated by reference numerals 2 and 3.4, respectively.・22. is a thread loosening device equipped with thread tension devices 22a and 22b used when the sewing machine is in any of the thread tension states of "empty ring J+r sewing", and the other parts of this sewing machine are the same as those known in the art. It is constructed using parts.

Empty ring trap 1. Empty ring transfer device 3. are shown in FIGS. 2a and 2b together with their operating procedures.

The empty ring trap 1 has a suction window 11 for sucking the empty ring.
An air suction pipe 1 is installed behind the suction chamber 12 that has a hole in it.
The cutting knife 12a provided in the suction window 11 has an upper scalpel 24 fixed to one end,
In conjunction with the upper knife boxlock stand 25 that swings up and down (see Figures 7 and 8), the hollow ring 9 sucked into the suction window 11 is opened and closed to a predetermined length by opening and closing two cutter blades. It is designed to be separated.

On the other hand, an empty ring transfer device 3 installed in parallel with the empty ring trap 1 receives the empty ring 9 separated by the empty ring trap 1 and transfers the received empty ring 9 above the presser foot 2. In order to
It has a suction nozzle 31 connected to an air suction source (not shown) via a suction pipe 32. This suction nozzle 31 is connected to an air cylinder I4 connected to the rear of the empty ring catcher 1 via an L-shaped connection bracket 6 which will be described later.
It is fixed to the tip of the actuating rod 14a.

The connecting bracket 6 is fixed to the tip of the actuating rod 14a of the air cylinder I4 so as to protrude from a guide slit 15a formed on the side of the intermediate bracket 15. is fixed, so that when the operating rod 14a reciprocates, the suction nozzle 31 is moved from the empty ring removal position (FIG. 2a) to the empty ring transfer position (FIG. 2b), which will be described later.

The air cylinder 14 constitutes a driving source for the empty ring transfer device 1, and is provided with air supply and discharge pipes 14b and 14C for forward and backward movement, each with a speed controller (not shown) interposed therein. When air is supplied to the supply pipe 14b, the operating rod 14a is moved forward, and when air is supplied to the air discharge pipe 14c, the operating rod 14a is moved backward.

When the suction nozzle 31 is in the empty ring trapping position, the tapered portion 5a formed on the rear side of the holding tool 5 contacts the inclined surface 7a of the slope cam 7, so that the suction nozzle 31 becomes the empty ring catcher. When the operating rod 14a extends and reaches the empty ring transfer position, it returns to a state parallel to the empty ring trap 1.

3a to 5 are diagrams illustrating the relationship between the holding tool 5 and the connection bracket 6 that enables the operation of the suction nozzle 31 of the empty ring transfer device 3.

The holding tool 5 is constructed by inserting a step screw 52 with a spring 51 fitted thereinto into the hole 5b and screwing it into the connection bracket 6.
It is pivotally attached to the connection bracket 6.

Spring storage hole 6a provided on the side of the connection bracket 6
The spring 62 housed inside applies its elastic force to the suction nozzle 31 to keep the suction nozzle 31 in the clockwise direction (indicated by the arrow), that is, so that the tip of the suction nozzle 31 is separated from the empty ring catcher 1. It is biased in the direction.

On the other hand, on the surface facing the holding tool 5, a sloped cam 7 having a sloped surface 7a formed in a notch on the front side is fixed to the intermediate bracket 15, and the holding tool 5 corresponds to the sloped surface 7a. A tapered portion 5a is formed on the rear side surface.

Therefore, according to such a configuration, when the suction nozzle 31 retreats and comes to the empty ring capturing position, the tapered portion 5a of the holding tool 5 touches the slope surface 7a of the slope cam 7, as shown in FIG. 3a. Since the suction nozzle 31 is in contact with the spring 6
When the tapered portion 5a of the holding tool 5 rides on the slope 7a of the slope cam 7 as shown in FIG. 5, the suction nozzle 3
Since I faces downward and approaches the suction window 11 of the empty ring trap 1, it becomes easy to receive the empty ring 9 from the empty ring trap 1.

Note that the protruding end 61 of the connection bracket 6 is connected to the spring 6
This is a stopper for defining the return position of the suction nozzle 31 to which the elastic force of No. 2 is applied at the empty ring transfer position, and the holding tool 5 comes into contact with this stopper 61 at the empty ring transfer position.

Further, reference numeral 8 denotes a guide plate provided to prevent wobbling during reciprocating movement of the empty ring transfer device 3.

The presser foot 2 and empty ring presser mechanism 4 are shown in Figure 1 (Figure 9).
The configuration is as shown in .

That is, the presser foot 2 is provided with a guide groove 21 into which the ring 9 is inserted, on the side of its upper surface near the needle 1°. It has a pressing piece 41 having a shape corresponding to the shape.

The presser foot 2 is, as shown in FIGS. 14a and 14b,
A presser claw 201 in which a guide groove 21 for inserting the empty ring 9 is recessed, and a base plate 20 that constitutes the majority of the presser foot 2.
It consists of 2. The holding claw 201 is for holding down the cloth 18 placed on the upper surface of the throat plate claw 17a (shown in FIG. 11a) provided on the throat plate 17, and is provided with a protruding piece 203 extending forward from the guide groove 21. ing. Reference numeral 204 denotes a holding leg, which is configured to prevent the empty ring 9 inserted into the guide groove 21 from being pulled out by a guide claw 205 formed in front of the guide groove 21.

As shown in FIG. 1, the empty ring holding mechanism 4 moves an operating cylinder 42 containing a spring (not shown) up and down by energizing an operating rod 43a of an air cylinder 43 fixed to the tip thereof using a solenoid valve or the like. The pressing plate 41 receives the elastic force of a spring (not shown) within the above-mentioned operating cylinder 42, so that the pressing force of the hollow ring 9 can be adjusted. Therefore, according to such a configuration, when the empty ring 9 is transferred to the upper part of the presser foot 2 by the empty ring transfer device 3, the empty ring holding mechanism 4 is activated and the holding plate 41 is moved.
9 and 1 due to the cooperative action of the empty ring transfer device 3 and the holding plate 41.
As shown in FIG. 0, it is pressed by the presser plate 41 and is securely inserted into the guide groove 21 of the presser metal 2.

In the embodiment of the present invention, the empty ring holding mechanism 4 includes an empty ring catcher 1. Although it is assumed that it will be subject to sequence control together with the empty ring transfer device 3, it may be configured to be operated manually by the operator or in conjunction with a step board (not shown) that raises and lowers the presser foot.

FIG. 6 is a diagram specifically showing another embodiment of the empty ring holding mechanism 4. As shown in FIG.

In this figure, the presser plate 41' has a long hole 41'a in its upper part that defines its cushion stroke, and a presser protrusion 41' in the lower part that has a shape corresponding to the guide groove of the presser plate.
'b', and a mounting bolt 47' is inserted into the elongated hole and is fixed to one end of the operating cylinder 42' in a manner that it cannot be removed.

The spring 44' housed in the actuating cylinder 42' suppresses its elastic force and urges the head of the temporary 41'.
The elastic force can be adjusted by adjusting the screwing position of an adjusting screw 45' screwed into the upper part of the cylinder 42'.

Further, the support arm 46' extending from the upper end of the operating cylinder 42' is connected to the operating rod 43' of the air cylinder 43'.
The vertical movement of the operating port 43'a is performed by supplying and discharging air into the air cylinder 43'.

Note that a through hole 46 bored at the extending end of the support arm 46'
'a' is for inserting and supporting a guide bar 49' which prevents the actuating cylinder 42' from swinging when the actuating rod 43a of the air cylinder 43 moves up and down.

The empty ring holding mechanism 4 is not limited to such an embodiment, and may include an air pressure regulator provided in the air supply pipe (not shown) of the air cylinder 43' to adjust the pressing force of the empty ring by the holding member 41'. It may be configured.

A series of controls performed to perform a hack tuck by the overlock sewing machine of the present invention are performed by operating electromagnetic valves and solenoids using a known sequencer. 3 is provided with a fixed position stop device that stops the upper louver 16 on the right side of the needle 10 when the suction nozzle 31 is activated, thereby preventing the suction nozzle 31 from colliding with the upper looper 16 when the suction nozzle 31 is activated. .

Also, if necessary, the suction nozzle 31 of the empty ring transfer device 3
It is also desirable to provide a safety device for forcibly stopping the driving of the sewing machine when the presser foot 2 is above the presser foot 2, and such a device can be easily implemented by those skilled in the art.

Next, with reference to FIGS. 7 to 9, the control operation procedure of the overlock stitch sewing machine of the present invention, which is executed to automatically perform the hack tank, will be described.

When the end of the fabric comes before the needle drop and the fabric detection sensor (not shown) detects that the fabric is gone, the luck counter (not shown) starts counting operation.

When the hand movement counter counts the specified number of hands,
The thread tension of the thread loosening device 22 is switched from the "sewing" state to the "empty ring" state, and the sewing machine A continues to be driven to form the empty ring 9.

Then, the needle positioner is activated, the fixed position stop device is activated, the needle 10 rises to the upper surface of the throat plate, the upper louver 16 is held at a position slightly shifted to the right of the needle, and the sewing machine A is no longer driven. will be stopped.

When sewing machine A stops driving, empty ring 9 is removed using the following procedure.
positioning is performed.

(b) The suction operation of the empty ring catcher 1 stops, and a part of the empty ring 9 sucked through the suction window 11 is transferred to the cutting cutter 12.
a, leaving an empty ring 9 of the size necessary for sewing the first part of the seam of the next fabric. (Fig. 7) (b) When the suction action of the empty ring trap 1 stops, the suction operation of the suction nozzle 31 of the empty ring transfer device 3 is started at the same time, and the suction nozzle 31 has the empty ring trap at its suction port 31a. Receive empty ring 9 from 1.

At this time, the empty ring capture device 1 and the empty ring transfer device 3 are in the empty ring light capturing position as shown in FIG. 2a.

(c) Then, the suction nozzle 31 moves forward while sucking the empty ring 9 into its suction port and holding it (Fig. 8).
The empty ring transfer position as shown in FIG. 2b is reached (FIG. 9).

(d) Then, the empty ring 9 is housed in the guide groove 21 of the presser foot 2, and when the suction nozzle 31 reaches a predetermined position above the presser foot 2, the empty ring holding mechanism 4 is activated;
The presser plate 41 above the presser foot 2 is lowered to fit the hollow ring 9 into the guide groove 21 of the presser foot 2 (FIG. 10). After fitting, the empty ring 9 is pressed and held for a while, but the pressing force at this time can be adjusted as described above. The transfer device 3 returns to the empty ring position shown in FIG.
When the fabric is inserted under the presser foot 2, the presser foot 2 descends again and presses down between the throat plate surface 17 and the presser foot 2. The fabric is pinched (Figure 11a).

(f) After that, when the sewing machine is driven, the suction window 11 of the empty ring catcher 1 starts the suction action again, and the needle movement counter starts counting based on the detection signal of the fabric edge detection sensor, and the predetermined number of stitches is counted. After that, the thread tension of the thread loosening device switches from "empty loop" to "sewing" state, and when the predetermined count number G is reached, the presser plate 41 rises and returns to the empty loop 9 and sews a new seam. Being engulfed (Chapter 11b)
(see figure).

In this way, the hollow rings 9 continuously formed after the oversewing are fitted into the guide groove 21 of the presser foot 2 and positioned one after another on the upper surface side of the fabric 18 when forming the seam 18a of the new fabric 18. This is the translation.

FIGS. 12(a) to 12(k) are timing charts showing the control procedure of each part in the embodiment of the present invention.

Effects According to the present invention, the following unique effects are achieved.

In other words, the hollow ring is inserted into the guide groove recessed on the top surface of the presser foot and positioned, and then sewn onto the top surface of the fabric, so there is no friction with the fabric surface when the hollow ring is sewn in, and the fabric is sewn in properly. It is possible to sew at high speed in the same condition. In particular, since the upper surface of the presser foot is recessed with a guide groove for positioning the empty ring, a slit for the feed dog is provided before the needle drops, allowing the feed dog to act on the fabric. Work efficiency is good because the needle drops quickly and accurate overlock stitching can be performed.

When the empty ring is transferred to above the presser foot by the suction nozzle of the empty ring transfer device, the empty ring holding mechanism 4 is activated and the presser plate is lowered to fit the empty ring into the guide groove of the presser foot and position it. Therefore, the empty ring can be positioned reliably.

Since the operator can observe the holding state and sewing state of the empty ring from the outside, the positioning of the empty ring can be easily adjusted. Therefore, when the sewing machine is started, it is possible to form a stitch from the first stitch, and there is no risk of skipping stitches when sewing an empty chain.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the appearance and configuration of an example of an overlock sewing machine to which the device of the present invention is applied, and FIGS. 2a and 2b are views showing the positional relationship at the position of the empty ring trapping layer. Figures 3a and 3b are partial plan views showing the positional relationship between the holding tool and the slope cam at the empty ring receiving position and the empty ring transfer position, respectively. Figure 5 is a cross-sectional view taken along the IVV line.
3a is a sectional view taken along the line V-V, FIG. 6 is a longitudinal sectional view of main parts showing another embodiment of the empty ring holding mechanism, and FIGS. 7, 8, 9, and 10 are 11a and 11b are both plan views of the throat plate portion when sewing in the empty ring, and FIG. FIG. 13 is a timing chart showing the control procedure of each part when hack-cooking a ring; FIG. 13 is a perspective view of the exterior configuration of another embodiment of an overlock sewing machine to which the device of the present invention is applied; FIG. 14a is
Figure 14b represents the X in Figures 11a and 11b, respectively.
- It is a sectional view taken along the X-ray line and the Y-V line. (Explanation of symbols) A and B are edge stitch sewing machines to which the device of the present invention is applied, ■ is an empty ring catcher, 12a is its cutting knife, 2 is a presser foot, 21 is its guide groove, 3 is an empty ring A transfer device, 31 is a suction nozzle, 4 is an empty ring holding mechanism, 41 is its holding plate, and 9 is an empty ring. Patent applicant: Pegasus Sewing Machine Manufacturing Co., Ltd. Representative Patent attorney: Takashi Suzue - Figure 4 Figure 6

Claims (1)

[Claims] An empty ring sewing device for use in an overlock sewing machine, comprising: an empty ring catcher having a cutting knife that sucks in and separates an empty ring continuously formed from the edge of a fabric through its suction window; It was designed to be able to move up and down with a recessed guide groove for inserting the empty ring into it. an empty ring transfer device having a suction nozzle for transferring the empty ring above the presser foot, and positioning the empty ring transferred by the empty ring transfer device by fitting it into a guide groove of the presser foot, What is claimed is: 1. A hollow chain sewing device for use in an overlock sewing machine, comprising: a blank chain presser mechanism having a presser plate that is movable up and down above the presser foot.