JP2793261B2 - Needle thread supply device of staggered sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an upper thread supply device of a staggered sewing machine.

[Conventional technology]

In a conventionally known staggered sewing machine, as shown in FIG. 3, a storage means 1 for outputting basic pattern data of one sewing pattern by selection from a plurality of sewing patterns, and a cloth feeding amount by a known cloth feeding mechanism. The pitch designation means 2 for each stitch, the needle amplitude setting means 3 for designating the maximum needle amplitude K of the sewing pattern, and if necessary, the cloth thickness data is read from the cloth thickness detecting means (not shown). The information is read from the main spindle detecting means 4 and the like, and the information is added to the calculating means 5 for each stitch and the corresponding upper thread supply amount is calculated for each stitch. The yarn feeding device 6 is controlled every time to optimize the yarn supply amount.

The arithmetic means 5 includes a ROM and a RAM for controlling the system.

There is no needle swing in the lockstitch sewing machine. Therefore, once the sewing pitch is set, the upper thread supply amount repeats the same length except for reverse stitching, and there is no need to calculate the upper thread supply amount for each stitch. In the case of a sewing machine, as shown in FIG. 4, the needle swing width T is obtained from the reference needle swing width T 'calculated from the pattern data and the width K set in the needle amplitude setting means by the arithmetic means 5, and 1 The stitch length L for each needle is obtained by adding the calculated needle swing width T and pitch P to the calculating means 5 and It is necessary to further calculate the upper thread supply amount based on the stitch length L. This swing width T and pitch P
Is usually different for each needle as shown in FIG. 5 depending on various pattern patterns.

FIG. 6 shows a disk-shaped rotating needle swing cam 7 incorporated in a conventional mechanical staggered sewing machine. Reference numeral 8 denotes a radially biased side surface of the rotary needle swing cam 7 in accordance with an endlessly formed sewing pattern. The cam grooves 9 are engaged with the cam grooves 8 and the cam grooves 8 are rotated as the rotary needle swing cam 7 rotates.
The vertical movement of the cam roller 9 is transmitted to the sewing needle via a needle swing rod and a swinging rod (not shown), and the needle swing is determined by the cam groove 8. Swings left and right by the swing width.

[Problems to be solved by the invention]

However, in the above-described staggered sewing machine having the conventional pattern data storage means, the operation means 5 reads information such as the feed pitch and the needle amplitude for each stitch, and based on these data, as shown in FIG. Since the upper thread supply amount for each stitch is calculated, it takes a long time to input information, calculate information, and control thread reeling out, which only causes a limitation on the upper limit rotation speed of the sewing machine main shaft during high-speed operation. However, there is a disadvantage that the control device becomes faster, more complicated, and more expensive. Further, in the conventional mechanical staggered sewing machine, the yarn supply was unstable.

[Means for solving the problem]

The needle thread supply device of the zigzag sewing machine according to the present invention is provided with needle swing data provided in the needle swing cam so that the calculation of the amount of needle swing can be simplified and speeded up.

The needle thread feeding device of the staggered sewing machine according to the present invention is provided on the rotary needle swing cam having a cam groove for setting the needle swing at each needle drop position and a cam roller engaging with the cam groove. Display means for indicating a reference needle swing displacement amount corresponding to the needle swing width at each needle drop position, and display means for indicating the reference needle swing displacement amount when the needle swing cam is rotated. A means for detecting a desired phase earlier than the cam roller to be detected; a calculating means for calculating a reference needle swing displacement amount from the detecting means together with cloth pitch information set in the sewing machine to set a needle thread supply amount for the next one stitch; Characterized by comprising:

The display means for indicating the reference needle swing displacement amount is a convex portion and a concave portion formed sequentially on the outer periphery of the needle swing cam, and the height change in the radial direction between the adjacent convex portion and concave portion indicates the reference needle swing displacement. The value is a value corresponding to the amount of displacement, and the convex portion and the concave portion extend at the same height around the needle drop position and at the same length in the left and right directions in the circumferential direction.

Further, the means for detecting the display means is an optical sensor spaced apart and opposed to the outer periphery of the convex portion and the concave portion, and is located at a position shifted by a desired distance from the position of the cam roller in the rotation direction of the rotary needle swing cam. It is in.

(Operation)

In the upper thread supply device of the staggered sewing machine according to the present invention, the needle swing amount indicating means is stored in the needle swing cam, and the information is obtained only half a stitch before the stitch, and the needle thread supply amount for the needle is obtained. The calculation will be done earlier.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the present invention, as shown in FIG. 1, a step or unevenness 10 is formed on the outer periphery of the rotary needle swing cam 7, and the step or unevenness 10 is formed.
The height of 10 in the radial direction is the vertical position A, B,
A value corresponding to the reference needle swing displacement set in accordance with the radial position of the cam groove 8 in C..., And serves as a display means of this displacement. The step or unevenness 10 is made to be the same height in the circumferential direction equal to the left and right centering on the vertical position A, B, C,... Of the needle.
This displacement amount detecting means 11 is disposed to be opposed to the outer periphery of the step portion or unevenness 10 so as to be spaced apart from the outer periphery of the stepped portion or the unevenness 10. The position is shifted by half the circumferential length of the step portion or unevenness 10.

Since the needle thread supply device of the present invention is configured as described above, the rotating needle swing cam 7 rotates and the deviation of the cam groove 8 is transmitted to the cam roller 9 to cause the needle to swing right and left. Before the half stitch, the reference needle swing displacement amount corresponding to the needle swing width of the needle is detected by the detecting means 11, and this detected information is added to the arithmetic means 5 together with other sewing pitch information and the like as shown in FIG. Can be The calculating means 5 calculates the needle amplitude L from the detected amount output from the detecting means 11 and the data from the needle swing width setting means, and calculates the needle thread supply amount earlier by half a stitch together with the pitch P from the pitch specifying means, The thread pay-out device 6 is driven at an appropriate timing of the sewing of the sewing machine based on data from the main shaft detecting means 4.

In the present invention, the above-mentioned step portion or unevenness 10 may be provided on the side surface of the rotary needle swing cam 7, and instead of the step portion or unevenness, a digital display such as color shading or a number may be used.

Further, the detecting means 11 may be a roller which is directly in contact with the step portion or the unevenness 10 and which is vertically displaced, and may be an element which can detect the density of a color or a numeral if necessary.

〔The invention's effect〕

As described above, according to the needle thread feeding device of the staggered sewing machine of the present invention, by recording the reference needle swing displacement amount on the needle swing cam, a memory for storing pattern data as in the related art can be eliminated, and By reading out the needle swing data before actual sewing, it is possible to easily calculate and control the thread feed-out amount, to operate sewing machine at high speed with good timing, and to use a simple operation means. is there.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a needle swing cam in a staggered sewing machine of the present invention, FIG. 2 is a block diagram of a staggered sewing machine of the present invention, and FIG. FIG. 4 is a block diagram of the thread supply device, FIG.
FIG. 5 is an explanatory view of an upper thread supply amount in a conventional staggered sewing machine upper thread supply device, and FIG. 6 is a front view of a rotary needle swing cam in the conventional staggered sewing machine. 1 ... storage means, 2 ... sewing pitch designation means, 3 ... needle amplitude setting means, 4 ... spindle detection means, 5 ... calculation means,
6 ... yarn feeding device, 7 ... rotary needle swing cam, 8 ...
Cam groove, 9 ... Cam roller, 10 ... Step or unevenness, 11 ...
Detection means.

Continuation of the front page (72) Inventor Toshiyuki Iwata 8-1-2 Kokuryo-cho, Chofu-shi, Tokyo Juki Corporation (56) References JP-A-54-163148 (JP, A) JP-A-64-64686 ( JP, A) Jikken 45-12607 (JP, Y1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D05B 3/02 D05B 45/00 D05B 19/00

Claims (3)

(57) [Claims] 1. A rotary needle swing cam having a cam groove for setting a needle swing width at each needle drop position and a cam roller engaging with the cam groove, and a rotary needle swing cam provided on the rotary needle swing cam. A display means for indicating a reference needle swing displacement amount corresponding to the needle swing width, and a display means for indicating the reference needle swing displacement amount when the needle swing cam rotates, are provided with a desired phase by a cam roller for detecting the deviation of the cam groove. And a calculating means for calculating the reference needle swing displacement amount from the detecting means together with the cloth pitch information set in the sewing machine to set the upper thread supply amount for the next one stitch. Needle thread supply device for staggered sewing machines. 2. A display means for indicating the reference needle swing displacement amount,
A convex portion and a concave portion sequentially formed on the outer periphery of the needle swing cam, and a change in height in the radial direction between the adjacent convex portion and concave portion is a value corresponding to a reference needle swing displacement amount; 2. The needle thread supply device according to claim 1, wherein the and the recess extend at the same height centering on the needle drop position and at the same length in the circumferential direction. 3. A means for detecting said display means is an optical sensor spaced apart and opposed to the outer periphery of said convex part and concave part, and is shifted by a desired distance from the position of said cam roller in the direction of rotation of said rotary needle swing cam. 3. The upper thread supply device according to claim 2, wherein the upper thread supply device is located at a different position.