JPS5936023B2 - Hole pattern sewing device in automatic embroidery machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a hole pattern sewing device using a known automatic embroidery sewing machine.

BACKGROUND ART Conventionally, a device is known in which a knife having a radial blade at the lower end is lowered to cut open a cloth, and a large number of overlock stitches are applied around the cut to form a buttonhole-like round hole.

However, when sewing a circular pattern like this, the fabric is cut, so
Since the area around the hole must be sewn closely together to prevent it from fraying, the pattern becomes bulky and stiff, making it unsuitable for use as a unit for sewing larger patterns.

An object of the present invention is to eliminate the drawbacks of the conventional circular pattern sewing as described above.

That is, this invention provides a push-opening member on the side of the needle bar that moves up and down in synchronization with the up-and-down movement of the sewing machine needle only when necessary, and uses the lower end of this member to push open the weave of the fabric without cutting the fabric open. By making a small hole in a part of the cloth and sewing the edge of the hole with a small number of stitches around this hole, a very flexible hole pattern with low bulk can be obtained. To provide a device that can draw a pattern.

The details of this invention will be explained below based on the accompanying drawings.

In FIGS. 1 and 2, 1 is a sewing machine arm, 2 is a needle bar, and this needle bar is driven by a known drive mechanism to move up and down.
Sewing machine needle 3 is attached to the bottom end.

Reference numeral 4 denotes a pair of bearings provided at the upper and lower parts of the arm 1 on the sides of the needle bar 2, and an elevating rod 5 is attached to the bearings 4 so as to be rotatable and movable up and down.

Reference numeral 6 denotes a lifting position limiting piece fixed near the top of the lifting rod 5, which hits the bearing 4 when ascending and hits the stopper 1 fixed to the arm 1 when descending, thereby limiting the upper and lower limits of the lifting rod 5. .

8 rotates together with the lifting rod 5 by means such as slidably engaging a square hole in the middle square cross section of the lifting rod 5;
A tension spring 9 is fitted between the upper side of this piece 8 and the limiting piece 6, and this spring moves the piece 8 up and down.
, 6 are connected, and a push spring 10 is fitted between the piece 8 and the lower bearing 4. When in the free state, the spring 10 pushes up the piece 8, and the piece 8 and the limiting piece 6 are connected via the tension spring 9. The needle bar 5 is raised together with the needle bar 5 so that the limiting piece 6 rests on the bearing 4 of the soil part.

Reference numeral 12 denotes a push-opening member, and a mounting bracket 13 on the upper part thereof is fixed to the lower end of the lifting rod 5 by means of screws or the like.

As shown in FIGS. 5 and 6, this push-opening member 12 has a tapered lower end, and a vertical guide groove 14 into which the descending needle 3 is fitted is formed on one side.

Reference numeral 15 denotes a projecting piece fixed in the middle of the needle bar 2, which is used to press down the passive piece 16 provided on the sliding piece 8 when the needle bar 2 is lowered.

The upper end of the lifting rod 5 becomes a flat part 1γ, and this flat part 1
γ is fitted between a pair of guide rollers 19 attached to a rotating piece 18 so as to be able to move up and down.

20 is a lever rotatably attached to the end of the arm 1 by a vertical shaft 21, and a pin 22 at the lower end of the lever is attached to the pivot piece 1.
8 and rotates the lever 20 to rotate the rotating piece 18 about the lifting rod 5,
When the rotary piece 18 rotates, the elevating rod 5 is rotated through engagement between the roller 19 and the flat portion 1γ, and the passive piece 1
A pair of stoppers 28 are provided on the arm 1 to control the rotation range of the rotary piece 18.
will be established.

Reference numeral 24 denotes an operating rod rotatably connected to the lever 20 by a pin 22, and this operating rod 24 is automatically controlled by a control device (not shown).

That is, although not shown in the drawings, a large number of arms 1 are provided in parallel, and each arm is provided with an embroidery frame at the bottom that moves back and forth and left and right by an automatic control device. Reference numeral 24 operates the levers 20 on each arm 1 at the same time.

Further, the cloth 25 attached to the embroidery frame is received by a receiving plate 21 having a ζ opening 26 as shown in FIG. This is the same as a known embroidery machine.

Since the device of the present invention has the above-mentioned configuration, when performing normal embroidery, the operating rod 24 is used to turn the lever 20 and turn the rotary piece 18, thereby turning the lifting rod 5, and the passive piece 16 is turned into a projecting piece. Place it in a position that does not hit 15.

If the sewing machine is operated in this state, even if the needle bar 2 moves up and down, its protruding piece 15 will not hit the passive piece 16, and therefore the elevating bar 5 and the push-up member 12 will remain up and will not work, so the sewing machine will not operate. If you operate the embroidery frame while doing this, any embroidery pattern can be sewn.

Next, the operating rod 24 is operated to rotate the elevating rod 5, and the passive piece 16 is positioned directly below the projecting piece 15.

When the sewing machine is operated in this manner, the protruding piece 15 presses down the passive piece 16 during the descent of the needle bar 2, and lowers the elevating bar 5 via the spring 9. As shown in Figure 5, the lower end of the cloth 25 is inserted,
With the stitches being pushed apart, the limiting piece 6 hits the stopper T and the lowering of the lifting bar 5 is stopped, after which only the needle bar 2 is lowered and the needle 3 is lowered into the opening opened by the member 12.

During this time, the passive piece 16 is pushed down by the protruding piece 15 of the needle bar 2, but the tension spring 9 only extends.

In this way, the needle 3 descends and the upper thread inserted into the needle hole of the needle 3 is caught by the tip of the hook mechanism at the bottom (not shown) to form a loop, and the needle thread is sewn together with the lower thread pulled out from the lower thread bobbin. In the process of forming the eye and raising the needle bar 2, the lifting bar 5 also rises,
Before the needle bar 2 rises and descends, the operating rod 24 moves and turns the lever 20, which turns the lifting rod 5 to place the passive piece 16 of the old woman in a position where it does not hit the protruding piece 15, and at the same time, the embroidery frame also moves. to move the cloth 25 appropriately.

Thereafter, only the needle bar 2 is lowered and the needle 3 is pierced into the cloth 25 immediately adjacent to the seam in the previously created opening to create a seam.

Next, while the needle bar 2 rises and reaches the upper limit, the operating rod 24 moves and the passive piece 16 of the lifting rod 5 moves to the protruding piece 1.
5, the embroidery frame also moves, and the needle bar 2 is lowered while stopping with the previously created opening directly below the member 12.
Create a seam inside the opening.

By repeating the above action to move the cloth 25 in all directions and sew the seams, a bulky material consisting of the seams surrounding the opening 29 formed by stretching the weave of the cloth 25 as shown in FIG. A low hole pattern stitch 44 is obtained.

FIGS. 3 and 4 show other embodiments, and parts different from those in FIGS. 1 and 2 will be explained.

In this case, the lifting rod 5 is the guide 3 on the upper and lower sides of the rocking plate 30.
It can be mounted so that it can be raised and lowered.

This swing plate 30 has its upper end attached to a bearing 33 of the sewing machine arm 1 by a shaft 32, and its lower end is attached to a spring 341.
It is being pulled towards arm 1 from this point.

In addition, a cam 35 is fixed to a part of the lifting rod 5, and the arm 1
This cam 35 is pressed by a spring 34 to a roller 36 provided on the needle bar 2, and when the lifting bar 5 is at the upper limit, the cam 35 rides on the roller 36 and removes the lower end member 12 from directly under the needle bar 2, and the lifting bar 5 descends, the cam 35 moves to the roller 36.
The structure is such that the member 12 descends directly below the needle bar 2.

Reference numeral 31 denotes an operating shaft disposed in front of the many arms 1, and this shaft is rotatably supported by a bearing provided on a frame (not shown).

Further, a lever 38 is fixed to the shaft 3γ for each arm 1, and the end of each lever 38 and a part of the elevating rod 5 are connected by a link 39, so that when the shaft 37 rotates, the elevating rod 5
It is configured so that it moves up and down.

In addition, an upward lever 40 is fixed to one end of the operating shaft 3γ, and this lever 40 is connected to an advancing/retracting lever 42 which is moved forward and backward by a drive device 41 such as an electromagnet or an air cylinder.
2 moves back and forth, a lever 40.38 is turned to move the lift bar 5 up and down, and the swinging range of the lever 40 is limited by a pair of stoppers 43 of the frame (not shown), so that the lift bar 5 can be moved up and down. Limit the scope.

In the case of the above embodiment, when the first drive unit 41 is activated by a signal from the control device to lower the lifting rod 5, the pushing member 12 at the lower end pushes out the weave of the cloth 25, and the lifting rod 5
When the needle bar 2 rises, the member 12 leaves the raising and lowering position of the needle 3. Therefore, the drive unit 41 is operated in conjunction with the raising and lowering movement of the needle bar 2, and the embroidery frame is moved. The pattern shown in Fig. 1 is obtained by the same action.

The device of the present invention is installed in an automatic embroidery sewing machine as described above, and is lowered when necessary to stretch out the fabric without cutting the fabric, thereby forming radial stitches in the openings formed. Since the cloth is not cut, a small, beautiful, bulky hole pattern can be obtained with a very small number of cross-shaped stitches. By arranging these patterns appropriately, beautiful flower patterns can be easily and easily created. There are benefits to be gained.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view showing one embodiment of the device of the present invention, Fig. 2 is an enlarged plan view of the same as above, Fig. 3 is a partially longitudinal side view showing another embodiment, and Fig. 4 is the same as above. FIG. 5 is an enlarged longitudinal sectional side view of the main part, FIG. 6 is an enlarged cross-sectional view of the sewing machine needle and the punching member, and FIG. 1 is an enlarged plan view showing an example of a seam. 2...needle bar, 3...sewing machine needle, 5...
...Lifting rod, 12...Pushing member, 14.
...Guide groove.

Claims (1)

[Claims] 1. In an automatic embroidery machine that sews any desired embroidery with a sewing machine needle that moves up and down at a fixed position on a cloth attached to an embroidery frame that moves back and forth and left and right by an automatic control device, an elevating rod is provided on the side of the needle bar, A pressing member is fixed to the lower end of this elevating rod, which presses against the fabric to the extent that it moves to the sewing machine needle lowering part and presses open the weave of the fabric during operation, and the side of this pressing member is attached to the sewing machine that moves up and down. Automatic embroidery in which a needle guide groove is provided and the needle bar and lifting rod are interlocked as necessary to sew stitches radially around the fabric that is being pushed open by the pushed down member. Hole pattern sewing device in a sewing machine.