JPS6241750B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides stitch-shaped means including a needle that supports a needle thread and moves up and down, and one or both of the needle and the object to be sewn using a cam or a cam as a mechanical storage means. Relating to a feeding device of a sewing device that forms a stitch in a predetermined shape by moving the needle in the horizontal direction when the needle is coming out of the fabric based on information stored in advance in a memory element as an electrical storage means, In particular, the present invention is characterized in that information in the storage means relating to one or more stitches (second stitch in this embodiment) at the beginning of sewing can be set afterwards.

Conventionally, this type of sewing device was manufactured by the Special Publication Corporation in 1973.
The one described in No. 27660 or JP-A-50-89160 is known. And, with these sewing devices,
For example, when the so-called bar tacking stitch shown in FIG. 3 is used, there are drawbacks as will be described later when the initial seam is formed.

Generally, when sewing thick fabrics with cotton thread or spun thread, and sewing thin fabrics with synthetic threads, the sewing pitch is often smaller in the latter than in the former, and the frictional resistance between the fabric and thread is smaller in the former. Larger, and smaller in the latter. Therefore, when sewing with a small stitch pitch using synthetic thread, even if the needle N slips out of the fabric W and is fed one stitch pitch to the left in the figure, as shown in Figure 4, Loop L of needle thread T ₁ is on needle plate NP
Since it is not caught between the surface and the lower surface of the fabric, when the needle thread T ₁ is pulled up by the thread take-up, the needle thread T ₁ of the already sewn stitches is easily pulled back to the thread take-up side, and therefore the needle thread T ₁ becomes the bobbin thread. It comes off from the knot Z with _T2 , or the stitching thread of upper thread _T1 lifts up. Also, the fifth
As shown in the figure, if there is a step in the fabric thickness, the upper thread T ₁ will be longer than the previous stitch in the stitch that includes the step, and the bobbin thread T ₂ will protrude to the top of the fabric.
This phenomenon occurs particularly when sewing is performed with a large stitch pitch, such as when sewing with cotton thread or spun thread. Therefore, in a conventional sewing device where the pitch of each stitch is fixed, if the stitch pitch is set to be optimal in the former case, the bobbin thread will be adjusted in the latter case.
If the stitch pitch is set so that T ₂ jumps out to the upper thread T ₁ side, and on the other hand, the stitch pitch is set so that it is best in the latter case, in the former case, the upper thread T ₁ jumps out from the knot with the lower thread T ₂ . There were some drawbacks such as it falling out and the stitching thread of needle thread _T1 coming up.

This invention allows the storage information of the feed information storage means for one or more stitches at the beginning of sewing to be set appropriately later, thereby adapting to the sewing conditions of different combinations of sewing thread and material to be sewn. The purpose of this invention is to eliminate the drawbacks of the above-mentioned conventional methods.

Embodiments of the present invention will be described below.

The sewing device 1 is a known cycle stitch sewing machine (hereinafter referred to as the sewing machine) in which starting/stopping and cloth feeding are mechanically controlled. The main shaft is interlocked via a clutch mechanism, and after a predetermined rotation of the main shaft, the clutch mechanism is released and the main shaft is stopped at the position where the needle 2 is raised to its highest position.The main shaft is generally constructed as follows.

The cam body 3 controls cloth feeding, has cam grooves in the X-coordinate direction and the Y-coordinate direction on both end faces, and rotates at a reduced speed in conjunction with the above-mentioned main shaft.

The first rocking body 4 is swingably supported on the machine frame by a horizontal shaft 5, and a roller 6 supported at one end of the first rocking body 4 is loosely fitted into a cam groove on one end surface of the cam body 3. At 7, the first rocking body 8, which is swingably supported on the machine frame, is interlocked with a square piece 9, and the position of the square piece 9 from the horizontal shaft 7 can be changed by a fixing means 10. Accordingly, the swing angle of the first series moving body 8 with respect to the first swing body 4 is changed. The lower end of the first moving body 8 is connected to a sliding body (not shown) that can freely slide along a straight line in the Y direction (left-right direction in FIG. 1) parallel to the bed plane, and furthermore, the cloth support 11 A feed table 12, which has a slider and is disposed on the upper surface of the bed, is rotatably supported on an axis perpendicular to this sliding member. The presser foot 13 is fixed integrally with the feeder table 12, and the presser foot 14 moves up and down and moves the presser foot 13 so as to clamp and release the cloth between the presser foot 14 and the cloth support 11.
Lockably supported.

The second rocking body 15 is swingably supported on the machine frame by a horizontal shaft 5, and a roller 16 supported at one end of the second rocking body 15 is attached to the cam body 3.
It loosely fits into the cam groove on the other end surface.

The second interlocking body 17 is supported by the machine frame with a shaft perpendicular to the lower part of the bed, one end of which is connected to the other end of the second rocking body 15 via a rod 18, and the other end is connected via a pin 19. It is linked with the feed stand 12.

The relationship between the cam body 3 and the feed base 12 is such that when the cam body 3 rotates and the first rocking body 4 is rotated clockwise or counterclockwise by one of the cam grooves, the cloth support 11 moves along the Y coordinate line. When the feed base 12 moves together with the sliding body so as to move to the right or left along The feed table 12 moves in an arc toward the front or the front of the paper in Fig. 1.
swings around the joint with the sliding body, and as a result of these combinations, the movement of the cloth held between the cloth support 11 and the presser foot 14, 14 can be controlled as desired with respect to the path through which the needle 2 passes. ing.

FIG. 2 schematically shows a part of the cam groove 20 on one side of the cam body 3 that acts on the second rocking body 15, and the angle α corresponds to the time when the needle 2 is coming out of the cloth. During the movement period of the feed table 12, the angle β
is its suspension period. The long grooves 21a and 21b formed in this cam body 3 are used for movement corresponding to the next stitch from the latter half of the movement period α corresponding to the first and second stitches (, in FIG. 3) at the beginning of sewing. The cam grooves 20 of the cam body 3 are formed parallel to a radial straight line passing through these ranges so as to divide the cam grooves 20 of the cam body 3 over the rotation angle range up to the first half of the period. Long groove 21a, 2
1b includes a sub cam 3a as a setting means, which has cam grooves 20a and 20b formed with cam grooves 20a and 20b, both ends of which are wider than the width of the cam groove 20, so as to communicate the divided cam grooves 20; 3b is slidably fitted along the radial line. These sub-cams 3a, 3b are fixed to the cam body 3 by set screws 22a, 22b, and an eccentric shaft 23 as an operating means is rotatably supported on the cam body 3.
One end of a, 23b is connected to the elongated hole 2 of each sub cam 3a, 3b.
4a and 24b with loose fit. Eccentric shafts 23a, 23
At the upper end of b, there are multiple (three in the example) corresponding to sewing conditions based on different combinations of sewing thread and cloth.
The markings P ₁ , P ₂ , and P ₃ are provided on the auxiliary cams 3a and 3b.

This invention has the above configuration, and the second part of the cam body 3
When the roller 6 of the first oscillating body 4 advances from the motion period α of the first stitch (a-b) to β due to rotation in the counterclockwise direction in the figure, the first oscillating body 4 moves into the first Since it rotates slightly clockwise in the figure, the cloth is fed a predetermined distance in the Y direction.

When the eccentric shaft 23a is rotated to align the marking P ₁ with the marking O, the sub cam 3a moves along the long groove 21a as shown by the chain line in Fig. 2, so the roller 6 advances during the above-mentioned stop period. In this case, the fabric is fed further to the right in Figure 3 than in the above case, and the pitch of the first stitch becomes longer by the distance corresponding to the amount of movement of the sub-cam 3a, and in contrast, the stamp _P3 is stamped. If you adjust it to O, the pitch of the first stitch will be shortened. Note that the sub-cam 3b is also similar to the sub-cam 3a, but in this case, the pitch of the second stitch changes.

As described above, in the present invention, information regarding the stitches other than one or more stitches at the beginning of sewing is stored in advance in the storage means, and information regarding the one or more stitches at the beginning of sewing is stored in the operating means afterwards. By configuring the settings to be set appropriately in relation to the operation mode, the stitch pitch at the start of sewing can be set to the optimal length in response to various sewing conditions, so even if the sewing conditions are changed, the bobbin thread It is possible to reliably form a seam without popping out or raising the upper thread from the first stitch, improving the appearance of the seam and the sewing strength between fabrics, and increasing the commercial value of sewn products.

In this embodiment, the feed plate 12 is purely mechanically driven and controlled by the cam groove 20 formed in the cam body 3, but the feed plate 12 is controlled to be driven via a motor based on electrical information stored in the storage means of the microcomputer. The present invention may also be applied to a type of sewing device in which the base 12 is driven and controlled. In this case, feed information corresponding to different sewing conditions for one or more stitches at the beginning of sewing and feed information for subsequent stitches are stored in advance in the storage means, and the sewing machine is started. In some cases, for one or more stitches at the beginning of sewing, the feed information corresponding to the operating mode of the operating means corresponding to the eccentric shafts 23a and 23b of this embodiment may be selected and read out by programming as appropriate. .

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the sewing machine, FIG. 2 is a partial plan view of a cam body having a changing means, FIG. 3 is a plan view of a seam, and FIGS. 4 and 5 are explanatory views of conventional defects.

Claims (1)

[Scope of Claims] 1. Stitch forming means that forms a regular stitch by cooperation with a needle that supports an upper thread and moves up and down and a hook that supports a bobbin thread and rotates in synchronization with the needle; a feeding means for horizontally moving one or both of the seam forming means and the sewing material at a time when the needle is coming out of the sewing material based on information stored in the mechanical or electrical storage means; In addition to providing a sewing device that can be operated manually in a sewing device that forms stitches along a planned shape,
The stored information is information related to stitches other than the one or more stitches at the beginning of sewing, and the information related to the one or more stitches at the beginning of sewing can be set later in relation to the operation mode of the operating means. A cloth feeding device for a sewing device characterized by: