JPH0616602Y2 - Mode change sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a computer sewing machine that stores multiple patterns, and more particularly to a sewing machine that switches the operation mode of a needle position adjusting device in accordance with a sewing pattern.

(Problems to be solved by the prior art and the invention) Of the multiple patterns, among the sewing methods for guiding the cloth position with respect to the needle, since the bark stitch is general, the bark stitch will be described as an example.

It has been widely practiced to perform combing stitches using a sewing machine, and as shown in FIG. 7, a comb stitch pattern stitch having a swing width W at the needle drop positions of a left needle drop position L and a right needle drop position R as shown in FIG. 8 is used to guide the left needle drop position L to the folding position of the cloth as shown in FIG. 8 to form the seam of the blind. The change of the needle drop position due to the adjustment of the width of this pattern seam is the zigzag base line. It depends on the position as follows. That is, in FIG. 9, the position of the base line is indicated by X, but in the case of the left base line as shown in FIG. 9a, the left needle drop position L is fixed and the right needle drop position R is moved by adjusting the swing. In the case of the right base line as shown in Fig. 9b, the right needle drop position R is fixed and the left needle drop position L is moved by adjusting the swing. On the middle base line, the left needle drop position L and the right needle drop position R are moved at the same ratio with respect to the center of the amplitude by adjusting the amplitude as shown in FIG. 9c. Using the comb pattern shown in FIG. 7, the cloth is folded as shown in FIGS. 10A to 10C, and the creases are provided on the cloth presser G of the sewing machine.
(See figure) and perform sewing.

At this time, the left needle drop position L must be set so as to slightly fold the fold of the cloth as shown in FIG. 11a. After the sewing is carried out, the cloth is expanded as shown in Fig. 12. At this time, it is required that the exposure of the seam thread on the cloth surface is small as shown in Fig. 12a. That is, in the case where the needle is caught too much in the fold of the cloth as shown in FIG. 11b, not only is the seam thread exposed on the front surface of the cloth when folded as shown in FIG. Since the thread is pulled and there is resistance, it has a drawback that it is difficult to return and the cloth is hung up. On the contrary, as shown in Fig. 11c, if it is far from the fold line of the cloth
As shown in Fig. C, the sewing of the cloth will be defective. Regarding the formation of the sewn seam including the case where the base lines are different, the following three types have been conventionally performed to guide the left needle drop position L to the fold of the cloth.

(1) The cloth guide part of the presser foot is fixed and the seam width and base line are also fixed.

(2) The cloth guide part of the work clamp is fixed and the width of the seam or the width and base line can be changed.

(3) The cloth guide of the work clamp is adjustable.

In the case of (1), the fixed cloth guide 48 is attached to the cloth retainer 47 as shown in FIG. 13, and the swing and the base line are fixed. The distance from the guide surface of the cloth guide to the left and right needle drop positions is fixed, but this dimension varies between the machine heads due to the precision of each part and other factors. For this reason, the sewn depth represented by the dimension from the folded position of the cloth to the left needle drop (Fig. 8d) takes into consideration the risk of the above-mentioned cloth sewing failure (shown in Fig. 11c and Fig. 12c). Therefore, as shown in FIG. 12b, conversely, the stitch thread is largely exposed on the front side of the cloth depending on the variation.

Those belonging to (2) further have their baseline positions (left, middle, right).
It is also classified by.

(A) In the case of the right base line, the right needle drop position R is fixed on the right base line as shown in Fig. 9b, and the depth of the combed stitch (Fig. 8d) is adjusted to the left by adjusting the swing. Adjust the needle drop position L. For this reason, the depth of stitching can be adjusted and the exposure of the seam thread to the surface of the cloth can be reduced, but the distance from the guide surface of the cloth is fixed at the right needle drop position, so Since it is also set to a large size in consideration of variations (Fig. 14D), the distance (E dimension) from the left needle drop position L sewn to the cloth end becomes large, and the cloth is folded back as shown in Fig. 15. At this time, the portion of dimension E is fluttered away from the cloth, and the fact that this portion is large impairs the finish.

(B) In the case of the left base line, the right needle drop position R can be adjusted by adjusting the swing width with respect to the cloth guide position as shown in Fig. 9a. Sewing width (dimension from the left needle drop position to the right needle drop position) Can be set arbitrarily, but since the left needle drop position L is fixed, it is the same as in the case of (1) above, and the depth of the cross stitch is set to a larger size in consideration of the poor sewing. Therefore, depending on the variation, as shown in FIG. 12b, some stitch threads are largely exposed on the front side of the cloth.

(C) In the case of the middle baseline, the left needle drop position L and the right needle drop position R can be changed by adjusting the swing width as shown in FIG. 9c, but the left and right needle drop positions move simultaneously by the same amount by adjusting the swing width. The right needle entry position also moves if the combing depth is adjusted. Therefore (a)
Alternatively, the same trouble as described in (1) occurs.

The type (3) is to adjust the position of the cloth guide G after setting the swing to the desired value as shown in FIGS. 16 and 17, and the needle position is fixed by fixing the cloth guide position of the above (a and b). It is different from the one that adjusts the depth of stitching. In this type, after setting the combing stitch width by adjusting the swing width, the cloth guide portion G of the cloth presser 47 can be moved to adjust the combing stitch depth d.
It is possible to reduce the exposed amount of seam thread. However, a clearance is required for fine adjustment of the cloth guide portion G. For this reason, some deviations in the clearance may cause the cloth guide portion to be shaken, which causes variations in the exposed amount of the seam thread on the cloth surface.

As described above, the conventional method has a surface which is insufficient for the conditions required for the comb stitch seam, and the seam forming device which does not include the above-mentioned drawbacks, that is, the guide portion of the cloth is firm.

Minimize the swing width as much as possible.

The needle drop position for the cloth guide can be adjusted.

Things are desired.

(Means for Solving Problems) In the present invention, in order to solve these problems, in a sewing machine in which a cloth presser provided with a fixed cloth guide is used and a stitch control signal is stored in an electronic storage device constituted by a microcomputer. , Of the multiple patterns, the needle position adjusting device is changed from the needle amplitude adjusting mode to the needle base line position adjusting mode for selecting a specific sewing pattern used for the sewing method which cooperates with the presser foot for guiding the cloth position to the needle. The means for switching to.

(Operation) By selecting the comb stitch pattern, the needle position adjusting device is switched from the needle swing width adjusting mode to the needle base line position adjusting mode and the needle swing width is set to a constant swing suitable for the comb stitching. When performing combing stitching, the cloth is guided and set in the cloth guide portion of the cloth presser, and the needle base line position is adjusted by the needle position adjusting device switched to the needle base line position adjusting mode with respect to the cloth position.

(Example) Next, the Example of this invention is described in detail with reference to drawings. First
The drawing is an external view of a sewing machine incorporating mode switching means for forming a comb stitch of the present invention. According to FIG. 4 of the configuration diagram, a sewing machine frame 1 is provided with a drive unit (not shown). A needle bar 3 which is connected and connected to a drive shaft 2 to which rotation is transmitted is supported so as to be vertically movable. The needle bar 3 is provided with a crank rod 9 rotatably connected to a shaft portion of a needle bar crank 8 fixed to one end of a crank 7 provided at a shaft end of a drive shaft 2 rotatably supported by the sewing machine frame 1. It is fixedly inserted through a needle bar holder 10 having a rotatable shaft portion at the other end, and is inserted through a needle bar support 11 at the upper and lower portions of the needle bar holder and supported so as to be vertically movable. The needle bar support is fitted on a shaft 12 fixed to the sewing machine frame 1, is restricted in vertical movement, and is supported rotatably only. The other end of the needle bar support 11 is connected to one end of a connecting rod 13, and the other end of the connecting rod is fixed to an output shaft 14a of a needle bar swing stepping motor 14 fixed to the sewing machine frame 1. It is connected to the arm 15 via a link 16.

A needle plate 18 having a needle hole 18a through which a fixed needle 17 is inserted at the tip of the needle bar 3 is fixed to the sewing machine frame 1 below the needle bar 3. Numeral 19 is a feed dog, which protrudes and retracts from the feed dog groove 18b provided in the needle plate 18 and the presser foot 2
In cooperation with 0, the cloth held between them is moved in synchronization with the vertical movement of the needle. The feed dog 19 is fixed to a horizontal feed arm 21 driven by the drive shaft 2. The momentum of the horizontal feed arm is adjusted by adjusting the swing of the horizontal feed arm. The member 22 is fixed to the shaft end of the adjusting shaft 23, and the amount of transmission to the horizontal feed arm 21 is adjusted by the rotation of the swing angle adjusting member. The member 22 is fixed to the other end of the adjusting shaft 23. An arm 24 and a crank 26 fixed to the output shaft of a feed adjusting stepping motor 25 fixed to the sewing machine frame 1 are connected via a link 27.

Reference numeral 28 is a hook serving as a needle thread catching means, which is rotatably supported by the sewing machine frame 1 below the needle plate 18 and is rotated by the drive shaft 2 in synchronization with the needle bar 3.
A rotary hook shaft gear 30 fixed to the shaft 9 and a rotary hook gear 31 fixed to the lower part of the rotary hook 28 mesh with each other to transmit rotation.

In FIG. 1, a scale frame 4 is attached to the sewing machine frame 1, and a keyboard 5 of a pattern selection device and a keyboard 6 for manually adjusting the position of the needle and the feed amount are attached to the scale frame. Has been done.

The structure of the control unit of the electronic sewing machine is as shown in FIG. 5 and will be described with reference to the operating method of the sewing machine shown in FIG.

The selection of the sewing pattern is selected by operating the sewing pattern selection keyboard 5, is read from the pattern generation information storage device 32, and is stored in the selected pattern generation information storage device 33. The sewing pattern stored in the pattern generation information storage device 32 is set to have a predetermined amplitude and feed amount of the needle. Further, the sewing pattern includes a general sewing pattern shown in FIG. 19 and the like and a specific stitch which requires control of the cloth guide position and the needle position of the cloth presser shown in FIG. A signal indicating that the pattern is specific is attached to the specific pattern.

The specific pattern determining means 34 determines whether or not the selected sewing pattern is a specific pattern. When the sewing pattern is not a specific pattern but a general sewing pattern as shown in FIG. 19 and the like, the input from the needle position adjusting key 35 of the needle position and feed adjusting keyboard 6 is switched by a judging signal from the judging unit 36. Is switched to the needle swing amount manually adjusting device 37 shown by the solid line in FIG. That is, the device including the needle position adjusting key 35 is switched to the swing mode. By operating the + key 35a of the needle position adjusting key 35, the swing amount is increased from a predetermined set amount, and by operating the-key 35b, the swing amount is decreased. Regarding the feed amount, after adjusting the feed amount adjusting key 38, the + and-keys for adjusting pattern generation are operated to adjust the predetermined feeding amount by 39, and stored in the adjusted pattern generation information storage device 40.

The needle position control motor 14 and the feed adjusting motor 25 are driven according to the timing signal generated by the rotation of the sewing machine motor according to the pattern generation information stored in the adjustment pattern generation information storage device 40 according to the sewing command to drive the needle position and the feed amount. To form a sewing pattern.

When the selected sewing pattern is the specific pattern shown in FIG. 18, etc., the input from the needle position adjustment key 35 is switched by the determination signal from the specific pattern determination means 34 by the switching means 36 and the needle base line position manual shown by the dotted line in FIG. Switch to adjusting device 41.

That is, the needle position adjusting device is switched to the needle base line mode.

The "sewn" pattern 42 of the specific pattern shown in FIGS. 2 and 7.
Stores a predetermined needle base line position R and a fixed swing amount W.

The + key 35a of the needle position adjusting key 35 moves the needle base line position R shown in FIG. 20 to the right with the fixed swing amount W as shown by the dotted line, and the-key 35b as shown by the dashed line in the figure. Move to the left as it is.

The feed amount is the same for general sewing patterns,
The + key 38b and the-key 18b of the feed adjusting key 38 are operated to adjust a predetermined feed amount by the feed amount manual adjusting device 39, and the adjusted pattern generating information storage device 40 stores the adjusted pattern generation information storage device 40.
The needle position control motor 14 and the feed adjusting motor 25 are driven in accordance with the timing signal generated by the rotation of the sewing machine motor according to the pattern generation information stored in the adjustment pattern generation information storage device 40 according to the sewing command to drive the needle position and Control the feed amount.

In the case of the embodiment of FIG. 18 sewn stitch pattern, the sewn presser foot having a fixed cloth guide as shown in FIG. 13 is used to guide the cloth and the sewn stitch shown in FIG. A pattern is selected, the pattern generation information is read from the pattern generation information storage device 32, and is stored in the selected pattern generation information storage device 33. The adjustment of the left needle drop position for the blind stitch in the combing stitch is performed by setting the right base line position Ro, which is the needle base line position, to the needle position adjustment key 35 because the needle swing amount W shown in FIG. 18 is fixed. It is adjusted by operating the + key 35a or the-key 35b of.

(Effect) As described above, according to the present invention, the sewing pattern is discriminated according to the selection of the sewing pattern between the general pattern and the specific pattern, and the needle position adjusting means is set to the needle swing amount adjusting mode and the needle base line position adjusting mode. By providing the switching means to and, one adjusting device is used as a needle amplitude adjusting device for general sewing patterns and as a needle base line position adjusting device for specific patterns by operating the selecting device. You can Therefore, by adjusting the needle base line position for a specific pattern used for sewing in cooperation with the cloth presser that guides the cloth position to the needle,
The needle position can be adjusted with a constant amplitude corresponding to the variation of the cloth position guided by the cloth guide position of the cloth presser.

[Brief description of drawings]

1 to 6 relate to an embodiment of the present invention, FIG. 1 is an external view of a sewing machine of the present invention, FIG. 2 is an explanatory view of a pattern selection keyboard, and FIG. 3 is a manual adjustment of needle position and feed. FIG. 4 is an explanatory view of a keyboard, FIG. 4 is an explanatory view of the internal structure of the sewing machine, FIG. 5 is an explanatory view of the configuration of the control unit, and FIG.
FIG. 7 is an explanatory view of a sewn stitch pattern stitch, FIG. 8 is an explanatory view of a state of forming a sewn stitch seam, FIG. 9 is an explanatory view of a needle drop position change due to a change in a base line, and FIG. FIG. 11, FIG. 11 is an explanatory view of the relationship between the folding position of the cloth and the needle drop position, FIG. 12 is an explanatory view of the exposed state of the seam thread on the cloth surface, and FIG. FIG. 14 is an explanatory view of a state of forming a sewn seam, FIG. 15 is an explanatory view of a folded state of a cloth, FIG. 16 is a perspective view of a movable cloth guide attached state, FIG. 17 is a front view thereof, and FIG. 18 is a cloth. FIG. 19 is a general sewing pattern, FIG. 20 is a general sewing pattern adjustment state explanatory diagram, and 5 is a keyboard of the pattern selection device. 6 is a keyboard for the needle position and feed adjusting device, and 36 is a switching means.

Claims (1)

[Scope of utility model registration request] 1. A pattern selecting device for selecting a desired pattern from a large number of sewing patterns in which the needle amplitude value is predetermined for each pattern, and the needle amplitude value of the sewing pattern selected by the pattern selecting device is a desired value. Needle position adjustment device that can be manually operated to adjust to
It is determined whether or not the sewing pattern is a specific sewing pattern for which it is required to adjust the needle drop position with respect to the cloth edge guide position of the cloth retainer that guides the cloth edge position in association with the selection operation of the pattern selection device. And a cloth edge guide of the cloth retainer from the needle amplitude adjusting mode for adjusting the needle amplitude range with respect to the needle base line position by the needle position adjusting device in response to the specific pattern judging result of the specific pattern judging means. A mode switching sewing machine having switching means for switching to a needle base line position adjusting mode for adjusting a needle base line position with respect to a specific needle drop position related to a position.