JPS6145797A - Hollow ring stitching apparatus in hemming 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 An industrial field of application The present invention is directed to removing an empty ring whose tip end is captured by an empty ring trapping device and continuing to a seam forming part from the empty ring trapping device, This invention relates to a so-called empty chain sewing device which automatically sews into the first part of a new piece of cloth in a state where it is folded 9 times forward from a forming part.

BACKGROUND OF THE INVENTION The purpose of sewing an empty ring at the beginning of the fabric as described above is to prevent the stitches at the beginning of the fabric from loosening and unraveling.

Therefore, in order to automatically sew an empty ring to the beginning of the fabric in this way, it is necessary to at least have an empty ring catcher for separating and capturing the empty ring, and to take out the caught empty ring and sew it. It is necessary to provide means for directing forwardly from the formation and means for positioning the directed empty rings in alignment. Hole ring sewing devices equipped with such various means have conventionally existed.

However, the conventional hollow ring sewing device is
As seen in Publication No. 0, as a means for directing the empty ring forward from the seam forming part, a configuration in which a long and narrow nozzle is provided in a suction window that captures the empty ring is used. As a means for positioning the rings in an aligned state, a concave groove of an appropriate length is formed in the throat plate from near the needle drop toward the front of the sewing machine, which causes the following problems.

Problems to be solved by the invention: (1) The empty ring is folded back to the bottom side of the new fabric and positioned in such a way that there is no risk of it getting inserted into the groove formed in the throat plate, but due to the structure of the throat plate, Since the concave groove cannot be extended to the needle drop point W, it is not possible to eliminate the friction with the fabric that affects the retention of the empty loop, which limits the workability.

■Since the empty ring is folded and sewn into the underside of the fabric where it cannot be seen by the worker, it is not possible to check whether the seam is formed properly or not. There are problems that arise.

■The jet from the elongated nozzle installed in the suction window that captures the empty ring directs the empty ring forward from the sewing machine needle, and the catch is picked up by a gripping device located relatively far away. Since it is fitted into the concave groove of the throat plate, the holding position of the empty ring becomes unstable, making it difficult to properly position it.

Means for Solving the Problems The present invention provides effective means for solving the above-mentioned problems in conventional devices.

In order to achieve the above object, the hollow ring sewing device in the overlock sewing machine according to the present invention includes a cutting knife that sucks in and separates the hollow ring continuously formed from the edge of the fabric through a suction window. a presser foot having a guide groove formed on the upper surface for inserting the empty ring; and a first position provided in front of the seam forming section where a suction nozzle at the tip approaches the empty ring trap. and a second position located in front of the seam forming part at night above the presser foot, and sucks and receives the empty ring captured by the empty ring trap at the first position. An empty ring transfer device configured to transfer the empty ring above the presser foot at a second position, and an empty ring transfer device that can be raised and lowered at the end of the presser foot, and the empty ring transferred by the empty ring transfer device by lowering. The main feature is that the ring presser mechanism is provided with an empty ring presser mechanism that fits into the guide 71 of the presser foot.

The empty ring captured by the working empty ring catcher is picked up by the empty ring transfer device and transferred to the second position 1. At this time, the empty ring transfer device moves in the space above the presser foot, so the empty ring is folded back from the seam forming part to the entire upper surface of the presser foot on the operator's side, and is placed above the guide groove formed on the entire upper surface of the presser foot. After being held in place, it is fitted into the guide blood by the empty ring holding mechanism and is pressed and held on the entire upper surface of the presser foot with appropriate pressure. Then, a new fabric is inserted into the presser foot, and as sewing begins, as the fabric moves forward, the presser foot 48 FtQ releases the pressure held midway and moves forward while sliding in the guide groove. It is sewn into the seam of the part.

Here, when the hollow ring holding mechanism is inserting the hollow ring into the guide groove, the free end of the hollow ring that protrudes from the end of the guide groove is blown with air toward a cutting knife for trimming one side of the fabric. If the ring sprayer is equipped with the above-mentioned structural requirements, by cutting the free end of the empty ring with a cutting knife, the length of the empty ring can be sewn into the fabric with the length kept constant. It is desirable to be able to maintain a good appearance. A second aspect of the present invention is a device equipped with the above ring spraying device.

Embodiment FIG. 1 shows an external perspective view of an overlock sewing machine equipped with a device of the present invention, in which 1 is a presser foot, 2 is an empty ring transfer device, and 8 is an empty ring presser mechanism. Although not shown in FIG. 1, an empty ring catcher 4 is provided on one side of the sewing machine bed B behind the presser foot 1, as shown in FIG. As is well known in Japanese Utility Model Publication No. 54-40195 and Japanese Utility Model Publication No. 57-55820, the empty ring catcher 4 sucks and cuts the empty ring continuously formed from the edge of the fabric through a suction window. It has a configuration with a cutting knife. 41 in Figure 9
The inlet window is indicated by .

42 is a cutting knife. The cutting knife 42 is provided inside the suction window 41. The suction window 41 is connected to a vacuum pump via an air suction pipe (not shown). On the other hand, the cutting knife 42 is composed of two cutter grades, which are opened and closed in conjunction with a vertically movable scalpel table 52 to which an upper knife 51 is fixed. By opening and closing the cutter blade, the empty ring C sucked into the suction window 41 is cut. A lower knife (not shown) is fixedly provided on the sewing machine bed below the upper knife 51, and together they constitute a cutting knife 5 for trimming one side of the fabric. The structure of this cutting knife is also well known in overlock sewing machines. In this embodiment, the cutting knife is driven in conjunction with the upper menu, but it is also possible to use a cutting knife configured to drive the knife at any time, for example, after the trailing edge of the fabric has passed through the sewing section and after an appropriate number of stitches. can.

In FIG. 1, the presser foot 1 is located on the needle plate 8) of the sewing machine bed B, supported by the tip of a presser foot 11 having a rotation center P on the back side of the sewing machine arm A. As shown in FIG. 11, the support structure by the presser foot 11 is such that the presser foot 12 is fixed to the tip of the presser foot 11, and the horizontal arm 12a formed at the lower end of the presser foot 12 is connected to the entire presser body 18 and the leaf spring 1.
It has a structure in which it is elastically sandwiched between 4 and 4. Therefore, the presser foot 1 can be raised and lowered around the horizontal arm 12a. The presser foot 1 is composed of a presser foot body 13, a plate piece 15 screwed to the presser foot body 15 for eliminating curling of the fabric, the leaf spring 14, and a base 16 of the leaf spring 14. A guide groove 16a for guiding the hollow ring C is formed near the right end of the pedestal 16. Guide groove 16a
is clearly shown in FIG. 18(b)). This figure shows a sectional view taken along the line 1-1 of FIG. 12 ρ). Guide groove 1
Cuts 1 and 2b are formed from below in the horizontal arm 12a located at the rear of 6a. This cut 12b serves to prevent the hollow ring C from wobbling and coming off the seam. The tip of the horizontal arm 12a is sloped smoothly as shown in FIG.
This allows for smooth entry into the interior.

In the figure, an arrow m indicates the path of the hollow ring C until it enters the notch 12b. Also, until the empty ring enters into the notch 12b as described above, the guide groove 16a
A tall wall plate portion 16b is formed upright on the right side of the guide groove 16a to prevent the guide groove from coming off.

The empty ring transfer device 2 is constructed as shown in FIGS. 1 and 10. That is, a long hole 21a is formed on the front side of the sewing machine arm A.
A bracket 21 is fixed to the bracket 21, and a driving and air cylinder 22 is fixed to the bracket 21, and a bracket 24 with an elongated hole 24a with a suction nozzle/l' 28 fixed to the tip is rotatably supported around a pitch of 25. Furthermore, a bracket 26 at the rod end of the driving air cylinder 22 is attached.
The structure is such that a pin 27 which is set upright is pushed through long holes 21a and 24a formed in the brackets 21 and 24. When the driving air cylinder 22 is moved forward or backward, the bracket 24 is rotated by 25 rotations.
The state in which the suction nozzle/l/28 is shown in Fig. 10 (a) and (
(b) Move between the states shown in (b). In this case, by appropriately selecting the length and bent shape of the suction nozzle/v28, the suction nozzle/v23 can be placed in the first position where it approaches the empty ring catcher 4 as shown in FIG. The second position is located in front of the seam forming part.

Further, by appropriately selecting the mounting height of the bracket 21, the suction nozzle /l/28 can be moved between the first position and the second position in the space above the presser foot 1. The suction nozzle 28 is a flexible hose 2
It is connected to a vacuum pump (not shown) via 8. Therefore, in the first position, the suction nozzle v28 receives the empty ring captured by the empty ring trap 4 by adsorption, and the empty ring is transferred to the second position.
It can be moved to any location. The suction nozzle 28 is constructed by bending a metal round pipe, and the tip of the nozzle is cut diagonally to form an oval opening. The reason why the opening is elliptical is to ensure that the empty ring is absorbed in the first position. The driving air cylinder 22 that controls the movement of the suction knife/l/28 is an air pipe 22a for forward and backward movement.

A double-acting cylinder with 22b is used. A speed controller (not shown) is interposed between both air pipes 22a and 22b to facilitate timing of movement of the suction nozzle/L/28 to the first and second positions.

The empty ring presser mechanism 3 includes an air cylinder 8 attached to the sewing machine arm A via a bracket 81 as shown in FIG.
A hollow ring presser 88 is attached to the tip of the rod No. 2. The mounting position of the air cylinder 82 is selected so that the guide groove 16a formed on the upper surface of the presser foot 1 is present at the lowered position of the ring presser 3B as the air cylinder 82 moves forward, and the tip of the ring presser 83 is It is formed into a wedge shape so that it can fit into the guide blood 16a. Like the driving air cylinder 22, the air cylinder 82 also uses a double-acting cylinder, and the air supply pipes 32a, 8
A speed controller (not shown) is interposed in each of the speed controllers 2b. Also, the air pressure t,!, is applied to the air supply pipe 82a on the side that advances the air cylinder 32. ! 7: A container (not shown) is interposed, and the ring presser foot 38 can be adjusted to fit the ring into the guide sea 16a of the presser foot 1 with appropriate pressure.

With the above structure, the series of steps to sew in the empty ring can be automatically performed by actuating electromagnetic valves and solenoids using a known sequence controller or the like. This series of processes will be explained according to the timing chart shown in Fig. 14. First, when the rear end of the fabric passes the seam forming area, the fabric detection sensor (not shown) detects this, and at the same time the needle movement counter (not shown) detects this. (outside) counts the number of needle movements, and when the appropriate count value is reached, the localization stop device for the looper etc. is activated, and the needle is brought out from the throat plate to the L side and the knife is sucked into the nozzle/v28. The sewing machine stops at a position that is not on the movement path. Since the empty ring catcher 4 is in operation until the sewing machine stops, the empty ring 0 is cut by the cutting knife while being sucked into the suction window 41 as shown in FIG. Simultaneously with the stopping of the sewing machine, the empty ring catcher 4 stops operating, and instead the empty ring transfer device 2 moves from the second position to the first position, and the nozzle 28 at its tip starts suctioning. As a result, the empty ring C from the empty ring catcher 4 is received by the nozzle/l/23 as shown in FIG.

In order to ensure safety, it is desirable to provide a sewing machine startup safety device that forcibly stops the sewing machine when the suction nozzle 28 is in the first position.

Such a safety device and a fixed position stop device such as the looper can be easily implemented by those skilled in the art.

When the suction nozzle /l/2B sucks 5 u of the empty ring C at the first position, the empty ring transfer device 2 returns to the second position in that state. As a result, the empty ring C is folded back to the north of the presser foot 1 as shown in FIG. Subsequently, the empty ring presser mechanism 8 is activated to lower the empty ring presser 88. Thus, as shown in FIG.
16a. After that, the suction nozzle 28 stops sucking, and then a new fabric is set.
When the sewing machine resumes operation, as the fabric moves forward, the suppression holding by the empty ring presser mechanism is released midway, and the guide groove 6
The empty ring in a moves forward and is sewn into the beginning of the fabric E as shown in FIG. Figure 12 shows the sewn-in state (
(b) Shown in (b).

By the way, the second aspect of the present invention is one in which an air ring sprayer is provided in addition to the above configuration. The ring sprayer is designated by the numeral 9 in FIG. In the illustrated example, the air ring sprayer is composed of a metal pipe, which is attached to a bracket 9.
1 to hold it on the presser foot 11. It is desirable that the operation timing of the empty ring sprayer 9 starts when the suction action of the suction nozzle 28 has stopped, as shown in FIG. If activated at the right timing, the free end side of the hollow ring C protruding from the end of the guide groove 16a will be moved as shown in FIG. The air is sprayed in the direction of the north knife 51. Then, when a new conquering area E is set and the sewing machine resumes operation, the upper knife 51 also operates, so the empty ring that is sprayed in the direction of the upper knife 51 is The free end side of the Kh
It is cut by the knife 51. The metal pipe is connected to a flexible hose 92 within a bracket 91. The flexible hose 92 is connected to an air pump (not shown). The tip nozzle portion 93 of the metal pipe faces the front end portion of the guide groove 16a on one side of the presser foot. On the other hand, an arc-shaped notch groove 16c is formed at the front end portion of the guide groove 16a, as shown in FIG. 7416 like this
The reason why c was formed was to keep the empty ring lengths short.

That is, when the empty ring C protruding from the empty ring presser 33 is blown by the empty ring sprayer 9, the groove 16C;'tz
m, the spray will be sprayed in the direction of the single knife 51 at the shortest distance, and as a result, the sky rings will be arranged in short order.

When the empty ring C is cut by the upper knife 51, there is no longer a need to spray in the direction of the upper knife, so the empty ring sprayer 9 stops operating. Thereafter, as the fabric moves forward, the entire ring C slides forward within the guide k 16a and is sewn into the beginning of the fabric (see Figure 02 (b)).

In FIG. 1, reference numeral 100 denotes a thread loosening device equipped with thread tension devices 101 and 102, which are used when the sewing machine is in either the "empty ring" or "sewing" thread tension state.

14th] (h) shows the timing of switching between the empty ring state and the sewing state of this elephant casing 100. In the embodiment described above, the series of operations for sewing the empty ring is detected by the cloth edge detection device. It is controlled automatically (dynamically) based on a signal, or by a so-called quick dynamic control method in which a foot switch or a roof switch is provided and a predetermined operation is performed when these switches are operated. You can also.

J-Old λ Iron The hollow ring sewing device in the overlock sewing machine according to the present invention is constructed as described above, and has the following effects.

■ The blank ring is inserted into the guide groove formed on the presser foot J:, and is sewn into the fabric surface while being positioned, so there is no friction with the fabric surface when sewing the blank ring, and therefore high speed is achieved. You can sew in. Moreover, since the guide groove is formed on the presser foot surface and not on the needle plate 1 as in the conventional case, a thread (S) for the feed tooth is provided in front of the needle drop.
The feed teeth can be applied to the fabric, so that the edge of the fabric can be accurately and quickly brought to the needle drop, and the edges can be sewn efficiently.

(2) In addition, since the operator can observe the state in which the empty ring is held and the state in which it is inserted into the collar from the outside, the positioning of the empty ring can be appropriately and easily adjusted. Therefore, when the sewing machine is started up, it is possible to form a stitch from the first stitch, and there is no risk of a stitch being left behind when sewing an empty chain.

■ The empty ring captured by the empty ring trap is transferred to the second position 1 while being adsorbed by the suction nozzle, and then inserted into the guide groove by the empty ring holding mechanism, so that the empty ring can be positioned easily. It will definitely be done.

■ Since the empty ring transfer device is provided in front of the seam forming section, it is easy to make the seam. In other words, the installation space is wide on the 01J side from the seam forming part, including the front part of the sewing machine arm, and the installation work is easy.
Assembly costs will be lower.

■ The empty ring transfer device can move in the space above the presser foot, so it does not interfere with fabric feeding, and the one installed in front of the seam forming part is located near the empty ring catcher behind it. (No. 1 1ift), so there is little danger to the farmers.

2 to 8 are diagrams illustrating a series of empty ring sewing operations performed by the device of the present invention, FIG. 9 is a view showing an empty ring catcher, and FIG. ) is a plan view showing the empty loop transfer device, FIG. 11 is a detailed perspective view showing the presser foot, and FIGS. , Figure 18 (a) is from the previous time (
A) 1-1 line cross-sectional view, figure (b) is the previous (b) ■-...
The line sectional view and FIG. 14 are timing charts showing the operation timing of each part when performing a series of empty ring stitching operations.

DESCRIPTION OF SYMBOLS 1... Presser foot, 2... Empty ring transfer device, 3... Empty ring presser mechanism, 4... Empty ring catcher, 5... Cutting knife, 9...
...Empty ring sprayer, 16a...Guide groove, 2B...
・Suction nozzle ρ, 41...Suction window, 42...
cutting knife.

C... empty ring, D... 罎1! Eye formation.

Agent Patent Attorney Tsukasa Nakajima Figure 12 (/i) , (B) Figure 13 (stomach) (B)

Claims (2)

[Claims] (1) An empty ring catcher that has a cutting knife that sucks and separates the empty rings formed continuously from the edge of the fabric through a suction window, and a presser foot that has a guide groove formed on the top surface into which the empty rings are inserted. , in a space above the presser foot between a first position, which is provided in front of the seam forming part, and the suction nozzle at the tip approaches the empty ring catcher, and a second position, which is located in front of the seam forming part. an empty ring transfer device that is movable and configured to suction and receive the empty ring captured by the empty ring catcher at a first position and to transfer the received empty ring above the presser foot at a second position; An empty ring in an overlock sewing machine which is equipped with an empty ring holding mechanism which can be raised and lowered above the presser foot and which inserts the empty ring transferred by an empty ring transfer device into the guide groove of the presser foot by lowering the presser foot. Sewing device. (2) An empty ring catcher having a cutting knife that sucks and separates the empty ring formed continuously from the edge of the fabric through a suction window, and a presser foot having a guide groove formed on the upper surface into which the empty ring is inserted. , is provided in front of the seam forming part, and moves in a space above the presser foot between a first position where the suction nozzle at the tip approaches the empty ring catcher and a second position located in front of the seam forming part. a presser foot; There is an empty ring holding mechanism that can move up and down above the gold and inserts the empty ring transferred by the empty ring transfer device into the guide groove of the presser foot. An overlock stitch characterized in that it is equipped with a hollow ring sprayer that sprays the free end of the hollow ring that protrudes from the end of the guide groove when it is inserted into the guide groove toward a cutting knife for trimming one side of the fabric. Empty chain sewing device on a sewing machine.