JP2734159B2 - Sewing machine tape feeder - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape feeder of a sewing machine, and more particularly, to a tape feeder of a sewing machine that clamps and feeds an expansion / contraction sewing tape with a feed member interlocked with a motor. Things.

[Conventional technology]

Conventionally, a tape feeder of a sewing machine of this type includes a motor that is rotated in synchronization with a sewing operation of a needle driven by a main shaft of the sewing machine, a controller that outputs a control signal to the motor,
It is provided with a roller for pinching and feeding the stretchable sewing tape in conjunction with the motor, and a setting device for setting a feed amount of the tape.
By controlling the feed amount of the tape by the setting device, the feed amount of the tape with respect to the cloth is changed so that the shirring feed can be performed. Conventionally, the tape feed amount set in the setting unit is increased in proportion to each set section as shown by the broken line in FIG. 1, that is, the change amount of the tape feed amount in each set section is It was to be constant in absolute value.

[Problems to be solved by the invention]

However, in the conventional tape feeder, the change amount of the set section of the tape feed amount is constant. Therefore, in a range where the tape feed amount is small, the ratio of the change of the set section of the tape feed amount is large, and the tape sewing is not performed. It was difficult to fine-tune the rise. In other words, in the region where the tape feed amount is large as shown by the broken line in FIG. 2, the rate of change of the tape feed amount in each set section does not fluctuate greatly, so that fine adjustment is possible to some extent. The smaller the number, the greater the rate of change, making it difficult to fine-tune the sewing of the tape.

[Object of the invention]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and a tape feed amount is stored in a setter so that a change rate of a tape feed amount in each set section is constant. It is an object of the present invention to provide a tape feeder which makes it easy to finely adjust the sewing finish of the tape over all set sections of the amount, and enables fine adjustment of the sewing finish even in a range where the tape feeding amount is small.

[Means for solving the problem]

In order to achieve this object, the present invention provides a feed member which is sandwiched by a stretchable sewing tape to be sewn on a work cloth and is driven to feed a needle to be moved up and down toward a drop point, and the feed member. A motor that drives the needle in time with the vertical movement of the needle,
Storage means for storing a large number of feed amount data from the small to large feed amount of the telescopic sewing tape by the feed member; designating means for designating one feed amount data from the respective feed amount data; Control means for controlling the drive so as to obtain a feed amount according to the feed amount data specified by the means, in the tape feed device of the sewing machine, the feed amount data stored in the storage means, The smaller the feed amount, the smaller the change amount of the feed amount between the closest feed amounts so that the change rate of the feed amount between the closest feed amounts is constant.

(Operation)

In the present invention having the above configuration, one feed amount data is selected by the designating unit from the large number of feed amount data stored in the storage unit, and the control unit drives and controls the motor according to the selected feed amount. As a result, the motor is rotated, and the tape is nipped and supplied by the feed member. Here, each feed amount data stored in the storage means is sent to the feed amount change amount between the closest feed amounts so that the change rate of the feed amount between the closest feed amounts is constant. Since the smaller the amount, the smaller the amount, it is easy for the operator to adjust sensuously, and fine adjustment when the tape feed amount is small becomes easy.

〔Example〕

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

As shown in FIGS. 3 and 4, a main shaft 4 which reciprocates up and down a needle 3 through which a needle thread Y1 is inserted vertically through a crank mechanism (not shown) is provided on a sewing machine arm 2 provided above the sewing machine bed 1. It is supported by. A shuttle drive shaft 6 for driving a shuttle 5 accommodating the bobbin thread Y2 is horizontally supported by the sewing machine bed 1, and both shafts 4, 6 can be rotated synchronously by a timing pulley 7 and a timing belt 8. Further, a pulley 9 is fitted and fixed to the right end of the shuttle drive shaft 6, and when the pulley 9 is rotated by a belt and a spindle motor (not shown), the needle 3 and the shuttle 5 are operated, and the upper thread is operated. Y1 and bobbin thread
The cloth W on the sewing machine bed 1 is sewn by Y2.

On the front surface of the sewing machine arm 2, bearings 10 and 11 support a spindle 1.
2 is supported horizontally, and the right end of the support shaft 12 is connected to a rotation shaft of a pulse motor 14 via a joint 13. A drive roller 15 as a feed member is fixed to the left end of the support shaft 12, and a stretchable sewing tape T is sandwiched between a driven roller 16 as a feed member supported by the bearing 10 and both rollers.
The tape T can be fed onto the upper surface of the cloth W by the rotation of 15, 15.

On the other hand, in the vicinity of the pulley 9, a speed detector 17 for detecting the operation speed of the needle and a needle position detector 18 as a needle number detecting means for detecting the position of the needle 3 are arranged, and output from both detectors. The speed signal and the hand position signal are inputted to a controller 19 as a control means which also serves as a storage means incorporating a computer. The controller 19 calculates the feeding timing of the elastic tape T based on the speed signal and the needle position signal, outputs a control signal to the pulse motor 14 based on the calculation result, and performs the sewing operation of the needle 3. The pulse motor 14 is rotated in synchronism with the above, so that the feeding timing of the elastic tape T is synchronized with the sewing operation of the cloth W in the normal sewing operation. Further, the controller 19 is connected to a setter 20 for setting the tape feed amount per stitch and the number of stitches (feed distance) corresponding to each feed amount. Similarly, the controller 19 is connected to a knee switch 21 for starting a tape T feeding operation based on the tape feeding amount and the number of stitches set by the setting device 20.

In this embodiment, the setting device 20 and the knee switch 21 constitute a designating means for designating one set section from each set section of the tape feed amount.

The feed amount of the cloth W during the normal sewing operation of the cloth W by the needle 3 is set to, for example, 2.5 mm per stitch. During normal sewing operation, the tape T is also 2.5m per stitch.
m, and this state is maintained until the knee switch 21 is operated.

In this embodiment, 100 setting sections are set in the controller 19, and data of the tape feed amount (mm / 1 stitch) is stored for each setting section. More specifically, each setting section
No. and the corresponding tape feed amount are set as shown in the following table.

FIG. 1 is a solid line obtained by converting the data shown in the preceding table into a graph, and FIG. 2 is a solid line showing the rate of change of the tape feed amount for each set section. The change rate σ of each set section of the feed amount in FIG. 2 can be obtained from the numerical values in the table described above by the following equation.

σ = (Xn + 1−Xn) / Xn where N is the tape feed amount setting section No. Xn is the tape feed amount for the set section No. In this embodiment, the change rate σ of the tape feed amount for each set section is 1.4% (= 5/350 × 100).

Further, in this embodiment, the tape feed amount for the shirring feed is selectively set from among the set section numbers by the setter 20, and the number of stitches corresponding thereto can be set.

Next, the operation of the tape feeding device configured as described above will be described mainly with reference to the flowcharts of FIGS.

First, in step 1 of FIG. 5, the setter 20 sets the tape feed amount of all sections (for example, the first to third sections) except the zero section in accordance with the set section No. according to the tape sewing portion of the cloth W. Is selected and set in advance. At the same time, the setter 20 also sets the number of stitches in each section.

Next, a start switch (not shown) is turned on to perform a normal sewing operation of the sewing machine needle. In this embodiment, this section is designated as 0th.
Sections.

In step 2 in FIG. 5, the pulse motor 14 is driven based on the tape feed amount in the 0th section. When the elastic tape T is first supplied to the upper surface of the sewing machine bed 1 by the rollers 15 and 16 without supplying the cloth W, the tape T
Is fed at a feed amount of 2.5 mm per stitch in the 0th section, and only the tape T is sewn by the cooperation of the needle 3 and the shuttle 5.

In this state, when the cloth W is supplied to the needle 3 side by a cloth feeding device (not shown) on the upper surface of the sewing machine bed 1, the tape T is sewn on the upper surface of the cloth W. When the sewer presses the knee switch 21 at the same time as the sewing of the cloth W and the tape T is started, YES is determined in step 3 of FIG.
N = 1 is set by the controller 19, and the pulse motor 1 is sent from the controller 19 based on the tape feed amount (3 mm / 1 stitch) in the first section.
A control signal is output to 4, and the tape T is fed at a feed amount larger than the feed amount in the 0th section.

FIG. 6 shows a flow of driving the pulse motor 6. The tape feed amount No. in the selected section is read out, pulse data corresponding to the tape feed amount No. is read out from the data shown in the table, and a pulse is output to the pulse motor 14 according to the pulse data to output the pulse motor. Drive.

Next, in step 6 of FIG. 5, the number of stitches is counted, and in step 7, the predetermined number of stitches in the first section (for example,
It is determined whether or not sewing has been performed for only 50 stitches. In the case of N0, the count of the number of stitches is continued. The tape T is fed on the basis of the number of stitches (for example, 2 mm / 1 stitch) and the number of stitches (30 stitches) in the third section. And step 8
In, it is determined whether the sewing of all the sections has been completed,
If NO, in step 9, N = N '+ 1, and the tape T is sequentially fed based on the tape feed amount and the number of stitches in a new section. In the case of YES, the knee switch 1
The process automatically returns to step 2 in a state before 1 is pressed, and only the tape T is fed and sewn with the feed amount in the 0th section.

A plurality of cloths W are sequentially sewn while the sewing operation is intermittently sewn without cutting the tape T. In the present invention, the tape W for each set section stored in the controller 19 is used. Since the rate of change of the feed amount is fixed, the ease of tape stitching adjustment is the same over the entire range of the tape feed amount, and fine adjustment of the stitch finish even in the small tape feed range Becomes possible.

The present invention is not limited to the above-described embodiment. For example, instead of the knee switch 21, a switch for detecting a cloth may be used, and the configuration may be arbitrarily changed without departing from the spirit of the present invention. It can also be embodied.

〔The invention's effect〕

As is apparent from the above description, according to the present invention, the ease of sewing adjustment is the same regardless of the tape feeding amount, and the fine adjustment of the sewing finish can be performed even in a small tape feeding range. There is an effect that can be performed.

[Brief description of the drawings]

FIG. 1 is a graph showing a change in the tape feed amount with respect to each step, FIG. 2 is a graph showing a change rate of the feed amount in each set section with respect to the tape feed amount, and FIG. FIG. 4 is a sectional view taken along line AA of FIG. 3, FIG. 5 is a flowchart showing the tape feeding operation, and FIG. 6 is a flowchart showing the operation of the pulse motor. 3 ... needle, 4 ... spindle, 14 ... pulse motor, 15, 16 ...
... Driving and driven rollers as feed members, 17 ... Speed detectors, 18 ... Needle position detectors as stitch number detecting means, 19 ...
... A controller as storage means and control means, 20... A setting device as a designating means, 21... A knee switch as a designating means, W... Cloth, T.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Mamoru Suzuda 9-35, Horita-dori, Mizuho-ku, Nagoya, Aichi Prefecture Inside Brother Industries, Ltd. (72) Inventor Hiroyasu Iwakoshi 9-35, Horita-dori, Mizuho-ku, Nagoya, Aichi, Japan Address Brother Industries, Ltd. (56) References JP-A-60-90590 (JP, A) JP-A-3-7196 (JP, A) JP-A-62-123791 (JP, A) 12314 (JP, B2)

Claims (1)

(57) [Claims] 1. A feed member which is driven to hold a stretchable sewing tape to be sewn on a work cloth and is fed to a drop point of a needle which is moved up and down, and the feed member is moved up and down by the needle A motor to be driven in a timely manner, storage means for storing a large number of feed amount data from a small to a large feed amount of the stretch sewing tape by the feed member, and one feed amount from each of the feed amount data. A tape feeding device for a sewing machine, comprising: a designation unit that designates data; and a control unit that drives and controls the motor so that a feed amount corresponding to the feed amount data designated by the designation unit is obtained. The stored feed amount data is compared with the feed amount change amount of the closest feed amount so that the feed amount change rate of the closest feed amount is constant so that the change rate of the feed amount of the closest feed amount is constant. Tape feeding device of a sewing machine, characterized in that the small.