JP2009011544A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize a sewing machine by which the height setting of a center presser can easily be performed. <P>SOLUTION: This sewing machine 100 can set the suitable height of the center presser 2 in response to the thickness of a fabric or a stage section for each needle location point, being the height by which the center presser 2 hits the fabric, by calculating a difference between a reference pulse count being input for driving an center presser motor 4, and a driving pulse count corresponding to the actual rotation amount of the center presser motor 4 being detected by an encoder 5 for each needle location point, when the center presser motor 4 is driven so that the center presser 2 may be made to hit a location of the fabric being equivalent to each needle location point in sewing data while moving the fabric being held by a holding frame 111, conforming to the sewing data which are stored in a ROM 203. Then, the preparation of the sewing data in which the set center presser height for each needle location point is reflected is possible. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a sewing machine, and more particularly to a sewing machine including an intermediate presser.

Conventional sewing machines such as embroidery sewing machines that perform sewing while transporting the cloth in the XY direction without using a feed dog prevent the cloth from rising and fluttering with the needle due to friction with the needle. An intermediate presser device is provided that presses down the vicinity of the needle penetration portion of the cloth when the needle is raised.
This intermediate presser device normally presses the cloth downward by the intermediate presser when the needle is lifted from the cloth, and after the needle is completely lifted from the cloth, the intermediate presser is lifted together with the needle (for example, (See Patent Document 1).

And so that the intermediate presser device can suitably prevent the cloth from flapping, the thickness of the cloth or the overlapped cloth of each of the needle drop points where the needle pierces the cloth at the time of sewing corresponding to a predetermined sewing pattern. The height of the intermediate presser is adjusted and set in advance according to the stepped portion and the like.
JP 2006-102376 A

  However, in the case of the above-described prior art, for example, by pressing various operation buttons on a touch panel type operation panel provided in the sewing machine and switching to various display screens, the height of the intermediate presser for each needle drop point is changed. In addition, there is a troublesome work of visually checking whether the height of the intermediate presser according to the set value is appropriate, and this work places a burden on the user.

  An object of the present invention is to provide a sewing machine capable of easily setting the height of the intermediate presser.

In order to solve the above problems, the invention according to claim 1 is a sewing machine.
A holding frame for holding the workpiece on the needle plate;
A sewing needle that moves up and down with respect to the sewing product held by the holding frame;
An intermediate presser that presses the sewing object against the needle plate during sewing,
An intermediate presser motor that moves the intermediate presser up and down to interlock with the vertical movement of the sewing needle;
An encoder for detecting the amount of rotation of the intermediate presser motor;
Sewing data storage means for storing sewing data composed of a plurality of needle entry point data in advance;
When the intermediate presser motor is driven based on the number of reference pulses for moving the intermediate presser by a reference amount, the encoder detects the needle entry point corresponding to the sewing data in a predetermined sewing product by the encoder. Pulse number detection control means for detecting the number of drive pulses corresponding to the rotation amount of the intermediate presser motor;
Pulse difference calculation means for calculating a difference between the number of drive pulses detected by the pulse detection means and the reference pulse number for driving the intermediate presser motor;
An intermediate presser height setting control means for setting the height of the intermediate presser for each needle drop point based on the difference in the number of pulses calculated by the pulse difference calculating means;
Sewing data setting control means for storing the intermediate presser height set by the intermediate presser height setting means in association with each needle drop point and reflecting it in the sewing data;
It is characterized by providing.

  According to the first aspect of the invention, the sewing machine corresponds to each needle drop point in the sewing data while moving the sewing object held in the holding frame in accordance with the sewing data stored in the sewing data storage means. When the intermediate presser motor is driven so that the intermediate presser abuts against the place of the workpiece to be sewn, the number of reference pulses input to drive the intermediate presser motor and each needle drop point are detected by the encoder. In addition, by calculating the difference from the number of drive pulses corresponding to the actual rotation amount of the intermediate presser motor, the height at which the intermediate presser hits the sewing product and the sewing product at each needle drop point A suitable intermediate presser height can be set in accordance with the thickness and the stepped portion, and sewing data reflecting the intermediate presser height set for each needle drop point can be created.

The invention according to claim 2 is the sewing machine according to claim 1,
A thread tension mechanism that applies thread tension to the sewing thread supplied to the sewing needle;
Thread tension storage means for previously storing thread tension data for each intermediate presser height;
With
The sewing data setting control means is configured to determine the thread tension corresponding to the intermediate presser height set by the intermediate presser height setting control means based on the thread tension data stored in the thread tension storage means. And stored in correspondence with the sewing data and reflected in the sewing data.

  According to the second aspect of the present invention, the sewing machine has the same effect as that of the first aspect of the invention, and the sewing machine has a thread tension corresponding to the intermediate presser height set by the intermediate presser height setting control means. Based on the thread tension data stored in the thread tension storage means, it can be stored in correspondence with each needle drop point and reflected in the sewing data.

According to the first aspect of the invention, the sewing machine corresponds to each needle drop point in the sewing data while moving the sewing object held in the holding frame in accordance with the sewing data stored in the sewing data storage means. When the intermediate presser motor is driven so that the intermediate presser abuts against the place of the workpiece to be sewn, the number of reference pulses input to drive the intermediate presser motor and each needle drop point are detected by the encoder. Further, by calculating the difference from the number of drive pulses corresponding to the actual rotation amount of the intermediate presser motor, the height at which the intermediate presser hits the sewing product based on the calculated difference in the number of pulses. It is possible to set a suitable intermediate presser height according to the thickness and stepped portion of the sewing product for each needle drop point, and to reflect the set intermediate presser height for each needle drop point. Create sewing data Can.
In other words, as in the prior art, the operation panel is operated to set and input the intermediate presser height for each needle entry point, and the actual intermediate presser height corresponding to the set value is visually checked. In this sewing machine, the intermediate presser height can be set almost automatically for each needle entry point, and the burden on the user can be greatly reduced. become.
Therefore, it can be said that this sewing machine can easily set the height of the intermediate presser.

  According to the second aspect of the present invention, the sewing machine calculates the thread tension corresponding to the intermediate presser height set by the intermediate presser height setting control means based on the thread tension data stored in the thread tension storage means. Since each needle entry point can be stored and reflected in the sewing data, the appropriate thread tension corresponding to the intermediate presser height is reflected in the sewing data as the intermediate presser height is set. Thus, more suitable sewing data can be created.

Hereinafter, embodiments of a sewing machine according to the present invention will be described in detail with reference to the drawings.
In the present embodiment, an electronic cycle sewing machine will be described as an example of the sewing machine.
The electronic cycle sewing machine has a holding frame that holds a cloth that is a sewing object to be sewn, and the holding frame moves relative to the sewing needle, so that a predetermined sewing is performed on the cloth held by the holding frame. The sewing machine forms a seam based on data (sewing pattern).
Here, the direction in which the sewing needle 108 described later moves up and down is the Z-axis direction (up-and-down direction), and one direction orthogonal to this is the X-axis direction (left-and-right direction). The direction perpendicular to the Y axis direction is defined as the Y-axis direction (front-rear direction).

  As shown in FIG. 1, an electronic cycle sewing machine 100 (hereinafter referred to as a sewing machine 100) includes a sewing machine main body 101 provided on the upper surface of the sewing machine table T and a lower part of the sewing machine table T for operating the sewing machine main body 101. A pedal R, an operation panel 300 provided on an upper portion of the sewing machine table T for performing an input operation by a user, and the like are provided.

(Sewing machine body)
As shown in FIGS. 1 and 2, the sewing machine main body 101 includes a sewing machine frame 102 whose outer shape is substantially U-shaped in a side view. The sewing machine frame 102 has an upper part of the sewing machine body 101 and extends in the front-rear direction, a sewing machine bed part 102 b that forms the lower part of the sewing machine body 101 and extends in the front-rear direction, and the sewing machine arm part 102 a and the sewing machine bed part 102 b. And a vertical body portion 102c that connects the two.
The sewing machine body 101 has a power transmission mechanism disposed in the sewing machine frame 102, and has a main shaft (not shown) and a lower shaft (not shown) that are rotatable and extend in the front-rear direction. The main shaft (not shown) is arranged inside the sewing machine arm portion 102a, and the lower shaft (not shown) is arranged inside the sewing machine bed portion 102b.

The main shaft of the sewing machine 100 is connected to a main shaft motor 20 (see FIG. 4), and rotational power is applied by the main shaft motor 20. The lower shaft (not shown) is connected to the main shaft via a connection mechanism (not shown). When the main shaft rotates, the power of the main shaft is transmitted to the lower shaft side via the connection mechanism, and the lower shaft rotates. It comes to move.
A needle bar 108a that moves up and down in the Z-axis direction by rotation of the main shaft is connected to the front end of the main shaft, and a sewing needle 108 is replaceably provided at the lower end of the needle bar 108a. That is, the sewing needle 108 moves up and down in the Z-axis direction by the rotation of the main shaft accompanying the driving of the main shaft motor 20.

In order to prevent the cloth from being lifted by the vertical movement of the sewing needle 108, the sewing machine arm 102a moves up and down in conjunction with the vertical movement of the needle bar 108a and presses the cloth around the sewing needle 108 downward. An intermediate presser device 1 having 2 (see FIG. 3) is provided. The main body of the intermediate presser device 1 is disposed inside the sewing machine arm portion 102a, and the sewing needle 108 is provided by being inserted through a through hole formed on the distal end side of the intermediate presser 2.
Further, the sewing machine arm 102a is provided with a thread tension mechanism 30 (see FIG. 4) that applies thread tension to the sewing thread supplied to the sewing needle. The configuration and operation of the thread tension mechanism 30 are the same as those conventionally known and will not be described in detail here.

Further, as shown in FIGS. 1 and 2, a needle plate 110 is disposed on the sewing machine bed portion 102b, and the holding frame 111 and the sewing needle 108 are disposed above the needle plate 110. It has become.
The holding frame 111 is attached to an attachment member 113 disposed at the front end of the sewing machine arm portion 102a. The attachment member 113 has an X-axis motor (not shown) and a Y-axis motor arranged in the sewing machine bed 102b. (Not shown).
The holding frame 111 holds the cloth to be sewn on the needle plate 110 and moves the held cloth in the front-rear and left-right directions together with the holding frame 111 as the X-axis motor and the Y-axis motor are driven. Yes. By the movement of the holding frame 111 and the operation of the sewing needle 108 and the hook (not shown), a seam based on sewing data of a predetermined sewing pattern is formed on the cloth.
The holding frame 111 includes a cloth presser (not shown) and a lower plate (not shown), and the attachment member 113 is driven up and down by driving a cloth presser motor (not shown) disposed in the sewing machine arm 102a. It is possible to hold and hold the cloth between the lower plate and the lower plate when the cloth presser is lowered.
A technique for forming a seam based on sewing data composed of a plurality of needle drop point data by the cooperation of the holding frame 111 that moves back and forth and right and left and the sewing needle 108 that moves up and down is the same as that conventionally known. Therefore, it is not detailed here.

  The pedal R operates as an operation pedal for driving the sewing machine 100 and moving the needle bar 108a (the sewing needle 108) up and down and operating the holding frame 111. That is, the pedal R incorporates a sensor for detecting the depression operation position when the pedal R is depressed, and an output signal from the sensor is output as an operation signal for the pedal R to the control device 200 described later to control the pedal R. The apparatus 200 is configured to drive and operate the sewing machine 100 in accordance with the operation position and operation signal.

In addition, the sewing machine 100 is provided with an operation panel 300 for performing an operation input by a user, and various data and operation signals input to the operation panel 300 are output to a control device 200 described later.
The operation panel 300 is configured to include a liquid crystal display panel and a touch panel provided on the display screen of the liquid crystal display panel, and by touching various operation keys displayed on the liquid crystal display panel. The touch panel detects the position where the touch is instructed, and outputs an operation signal corresponding to the detected position to the control device 200 described later.

(Intermediate presser device)
As shown in FIG. 3, the intermediate presser device 1 includes an intermediate presser 2 that presses the cloth against the needle plate 110 during sewing, and an intermediate presser bar that includes the intermediate presser 2 at the lower end portion and has a rack 3 a formed on the side surface. 3, an intermediate presser motor 4 having a pinion 4 a, an encoder 5 for detecting the rotation amount of the intermediate presser motor 4, and the like. The intermediate presser bar 3 is supported by a pair of upper and lower bearings 6 and 6 so as to be movable up and down.

The intermediate presser 2 is a tip portion of the intermediate presser device 1 that contacts the cloth around the sewing needle 108 so as to press it downward, and a through hole through which the sewing needle 108 is inserted is formed.
The intermediate presser bar 3 is supported by the bearings 6 and 6 so as to be movable up and down, and a rack 3 a formed on a side surface meshes with a pinion 4 a of the intermediate presser motor 4.

The intermediate presser motor 4 is a pulse motor, and rotates the pinion 4a forward and backward in response to the input of a pulse signal. The intermediate presser motor 4 rotates the pinion 4a forward and backward by a rotation amount corresponding to the number of pulses in the pulse signal, and the intermediate presser bar 3 and the intermediate presser 2 via the rack 3a meshed with the pinion 4a. Move up and down. That is, the amount by which the intermediate presser 2 moves up and down is adjusted according to the amount of rotation by which the intermediate presser motor 4 rotates the pinion 4a.
The encoder 5 detects the rotation amount of the intermediate presser motor 4, in particular, a positive rotation amount in the forward direction and a negative rotation amount in the reverse direction, and outputs the detected amount to the control device 200 described later.

(Control device)
Next, the sewing machine control apparatus 200 will be described.
As shown in FIG. 4, the control device 200 expands various programs and a CPU 201 that executes various controls and processes according to a program that controls the operation of each part of the sewing machine 100, a program related to sewing data setting processing, and the like. A RAM 202 serving as a work area of the CPU 201, a ROM 203 and an EEPROM 204, which store processing programs and processing data for executing various processes, and the like are provided.

The ROM 203 stores basic sewing data indicating a sewing pattern composed of a plurality of needle drop point data, and functions as sewing data storage means.
The ROM 203 stores a table relating to thread tension data for each intermediate presser height, in which the intermediate presser height and the thread tension are associated with each other, and functions as a thread tension storage unit.

The ROM 203 stores an intermediate presser height setting program for setting the intermediate presser height for the basic sewing data, that is, for setting the intermediate presser height for each needle entry point in the basic sewing data. .
Then, when the CPU 201 executes the intermediate presser height setting program, the CPU 201 drives the intermediate presser motor 4 based on the reference pulse number for moving the intermediate presser 2 by the reference amount for each needle drop point corresponding to the sewing data. In addition, when the intermediate presser 2 abuts against each needle drop point on a predetermined sewing product, the drive corresponding to the rotation amount of the intermediate presser motor 4 detected by the encoder 5 for each needle drop point It functions as a pulse number detection control means for detecting the number of pulses. Note that the number of drive pulses detected when the intermediate presser 2 moves the reference amount without hitting the sewing product has the same value as the reference pulse number.
In addition, when the CPU 201 executes the intermediate presser height setting program, the CPU 201 detects the number of drive pulses detected by the CPU 201 as the pulse number detection control unit and the reference pulse input to drive the intermediate presser motor 4. It functions as a pulse difference calculation means for calculating the difference from the number.
In addition, when the CPU 201 executes the intermediate presser height setting program, the CPU 201 determines the height of the intermediate presser 2 for each needle drop point based on the difference in the number of pulses calculated by the CPU 201 as the pulse difference calculating means. Functions as intermediate presser height setting control means for setting. The CPU 201 as the intermediate presser height setting control means is, for example, a table stored in advance in the ROM 203, and stores the data in the intermediate presser height table in which the difference in the number of pulses and the intermediate presser height are associated with each other. Based on this, the intermediate presser height is set.

Further, when the CPU 201 executes the intermediate presser height setting program, the CPU 201 stores the intermediate presser height set by the CPU 201 as the intermediate presser height setting means in association with each needle drop point, It functions as a sewing data setting control means to be reflected in the sewing data. That is, the CPU 201 as the sewing data setting control means sets new sewing data to which data relating to the intermediate presser height is added for each needle entry point in the basic sewing data, and the newly set sewing data is stored in the EEPROM 204. The memorized control is executed.
Further, the CPU 201 as the sewing data setting control means uses the thread tension corresponding to the intermediate presser height set by the CPU 201 as the intermediate presser height setting means as the thread tension for each intermediate presser height stored in the ROM 203. Based on the data, control corresponding to each needle drop point is stored and reflected in the sewing data. That is, the CPU 201 as the sewing data setting control means sets new sewing data to which data relating to the intermediate presser height and thread tension is added for each needle entry point in the basic sewing data, and the newly set sewing data is set. Control stored in the EEPROM 204 is executed.

(Setting process of intermediate presser height)
Next, processing for setting the height of the intermediate presser 2 of the intermediate presser 1 in the sewing machine 100 according to the present invention in accordance with the sewing data will be described based on the flowchart shown in FIG.

First, the user sets a cloth (cloth) that is a sewing product on the holding frame 111 of the sewing machine 100 (step S101). The basic sewing data relating to the sewing pattern to be applied to the fabric is selected by the user according to a predetermined procedure.
Next, when the user turns on a predetermined intermediate presser height setting start switch (start SW; not shown) on the operation panel 300 of the sewing machine 100, the processing according to the selected sewing data is performed. The intermediate presser height setting process for the fabric set to 111 starts (step S102).

As the start switch is turned on, the CPU 201 outputs a pulse signal of the reference pulse number to the intermediate presser motor 4 of the intermediate presser device 1, and the intermediate presser motor 4 receives the input reference pulse number (pulse signal). ) To move the intermediate presser 2 by a reference amount, and direct the intermediate presser 2 toward the fabric held by the holding frame 111 on the throat plate 110 side, in particular, a needle drop point (predetermined sewing) in the fabric. The needle is lowered toward the needle drop point corresponding to the sewing data indicating the pattern (step S103). In the present embodiment, it is assumed that a pulse signal having the reference pulse number “+10” is output.
Next, the CPU 201 causes the encoder 5 to detect the amount of rotation of the intermediate presser motor 4 when the intermediate presser 2 is lowered toward the needle drop point in the fabric, and the intermediate presser detected by the encoder 5 for each needle drop point. The number of drive pulses corresponding to the rotation amount of the motor 4 is detected (step S104).
Next, the CPU 201 calculates a difference (difference = reference pulse number−drive pulse number) between the detected drive pulse number and the reference pulse number input to drive the intermediate presser motor 4 (step S105).
Next, the CPU 201 sets the height of the intermediate presser 2 for each needle drop point based on the calculated difference in the number of pulses (step S106). Specifically, the CPU 201 is a table stored in advance in the ROM 203 based on the calculated difference in the number of pulses, in the intermediate presser height table in which the difference in the number of pulses and the intermediate presser height are associated with each other. Set the intermediate presser height based on the data.

Here, the process of setting the intermediate presser height as the intermediate presser 2 descends toward the fabric will be specifically described with reference to FIGS. 6 and 7.
The cloth set in the holding frame 111 is a cloth in which two cloths as shown in FIG. 6 are overlapped. The cloth is changed from the first needle drop point A to the needle drop point B and the needle drop point C. As described above, when the setting process is related to a sewing pattern that is sewn to the last needle drop point D, the drive detected by the CPU 201 at each needle drop point from the needle drop point A of the first stitch to the needle drop point B of the tenth stitch. When the number of pulses is “+10”, based on the intermediate presser height table shown in FIG. 7, the pulse number difference is calculated to be “0”, and the intermediate presser height is set to “0 mm”. That is, from the needle drop point A of the first stitch to the needle drop point B of the tenth stitch, the intermediate presser 2 lowered by driving the intermediate presser motor 4 based on the pulse signal of the reference pulse number “+10” is the cloth. It can be said that it is an area that descends to the lowest point without hitting.
Further, when the number of drive pulses detected by the CPU 201 is “+8” at each needle drop point from the needle drop point C of the eleventh needle to the needle drop point C of the twentieth needle, the intermediate presser height as shown in FIG. Based on the length table, the pulse number difference is calculated to be “2”, and the intermediate presser height is set to “2 mm”. That is, from the needle drop point of the eleventh stitch to the needle drop point C of the twentieth stitch, the intermediate presser 2 lowered by driving the intermediate presser motor 4 based on the pulse signal of the reference pulse number “+10” is driven. It can be said that the area hits the fabric at a position corresponding to the number of pulses “+8”. Then, it is detected that there is a cloth step on the eleventh needle.
Further, when the number of drive pulses detected by the CPU 201 is “+10” at each needle drop point from the needle drop point of the 21st needle to the needle drop point D of the 30th needle, the intermediate presser height table shown in FIG. Based on the above, the pulse number difference is calculated to be “0”, and the intermediate presser height is set to “0 mm”. That is, from the needle drop point of the 21st stitch to the needle drop point D of the 30th stitch, the intermediate presser 2 lowered by the driving of the intermediate presser motor 4 based on the pulse signal of the reference pulse number “+10” is applied to the cloth. It can be said that the area falls to the lowest point without hitting it. And it is detected that there is a cloth step on the 21st needle.

  And CPU201 outputs the pulse signal of the drive pulse number which is the same magnitude | size as the drive pulse number detected in step S104, and a positive / negative value differs to the intermediate presser motor 4, raises the intermediate presser 2, Origin detection is performed (step S107). Specifically, each needle drop point from the needle drop point A of the first needle to the needle drop point B of the tenth needle and each needle from the needle drop point of the 21st needle to the needle drop point D of the 30th needle At the falling point, the intermediate presser motor 4 is driven based on the pulse signal of the drive pulse number “−10”, and the intermediate presser 2 is raised to the origin. At each needle drop point from the needle drop point of the eleventh needle to the needle drop point C of the twentieth needle, the intermediate presser motor 4 is driven based on the pulse signal of the number of drive pulses “−8”, and the intermediate presser 2 is It rises to the origin.

Next, the CPU 201 determines whether or not the final needle drop point (30th needle drop point D) has been reached (step S108).
When the CPU 201 determines that the final needle drop point has not been reached (step S108; No), the holding frame 111 is moved to switch to an arrangement corresponding to the next needle drop point (step S109). The process returns to step S103.

On the other hand, when the CPU 201 determines that the final needle drop point has been reached (step S108; Yes), the CPU 201 determines the intermediate presser height set for each needle drop point so far for each needle in the basic sewing data. Corresponding to the drop point, new sewing data to which data relating to the intermediate presser height is added is set for each needle drop point in the basic sewing data, and the newly set sewing data is stored in the EEPROM 204. In particular, the CPU 201 determines the thread tension corresponding to the set intermediate presser height based on the thread tension data for each intermediate presser height stored in the ROM 203 (for example, the table in FIG. 7). Corresponding to the points, new sewing data to which data relating to the intermediate presser height and the thread tension is added for each needle drop point in the basic sewing data is stored in the EEPROM 204 (step S110).
Then, the intermediate presser height setting process ends.

  Then, by using the new sewing data stored in the EEPROM 204 and having the data on the intermediate presser height and the thread tension given to each needle drop point, the same sewing pattern is sewn on the same fabric. At this time, the intermediate presser 2 is arranged at an appropriate height, and it is possible to suitably perform sewing adjusted to an appropriate thread tension.

As described above, the sewing machine 100 pushes the intermediate presser 2 at the position of the cloth corresponding to each needle drop point in the sewing data while moving the cloth held in the holding frame 111 according to the sewing data having a desired sewing pattern. By driving the intermediate presser motor 4 of the intermediate presser device 1 so as to make contact, a suitable height of the intermediate presser 2 can be set for each needle drop point according to the thickness of the cloth and the stepped portion. Sewing data reflecting the intermediate presser height set for each needle entry point and the thread tension corresponding to the intermediate presser height can be created, and the new sewing data can be stored in the EEPROM 204.
In other words, as in the prior art, the operation panel is operated to set and input the intermediate presser height for each needle entry point, and the actual intermediate presser height corresponding to the set value is visually checked. In this sewing machine 100, it is possible to set the intermediate presser height for each needle entry point almost automatically, and the burden on the user can be greatly reduced. It becomes possible.
Therefore, the sewing machine 100 can be said to be a sewing machine that can easily set the height of the intermediate presser 2.
Then, by using the new sewing data stored in the EEPROM 204 and having the data on the intermediate presser height and the thread tension given to each needle drop point, the same sewing pattern is sewn on the same fabric. At that time, the intermediate presser 2 is arranged at an appropriate height, and sewing adjusted to an appropriate thread tension can be suitably performed.

  In the above embodiment, the intermediate presser height setting process related to the sewing of the linear sewing pattern is described as an example on the cloth in which two cloths are overlapped, but the present invention is not limited to this. It may be a setting process related to an arbitrary fabric and an arbitrary sewing pattern.

  In addition, it is needless to say that other specific detailed structures can be appropriately changed.

It is a perspective view which shows the sewing machine which concerns on this invention. It is an expansion perspective view which shows the holding frame of a sewing machine, and the vicinity of an intermediate presser. It is a perspective view which shows an intermediate presser device. It is a block diagram which shows the control apparatus of the sewing machine which concerns on this invention. It is a flowchart which shows the intermediate presser height setting process in the sewing machine which concerns on this invention. It is explanatory drawing which shows cloth and the sewing pattern given to the cloth. It is explanatory drawing which shows the table of the data regarding intermediate presser height.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intermediate presser 2 Intermediate presser 3 Intermediate presser bar 3a Rack 4 Intermediate presser motor 4a Pinion 5 Encoder 20 Spindle motor 30 Thread tension mechanism 100 Sewing machine 108 Sewing needle 110 Needle plate 111 Holding frame 200 Controller 201 CPU (pulse number detection control means , Pulse difference calculation means, intermediate presser height setting control means, sewing data setting control means)
202 RAM
203 ROM (sewing data storage means, thread tension storage means)
204 EEPROM
300 Operation panel

Claims (2)

A holding frame for holding the workpiece on the needle plate;
A sewing needle that moves up and down with respect to the sewing product held by the holding frame;
An intermediate presser that presses the sewing object against the needle plate during sewing,
An intermediate presser motor that moves the intermediate presser up and down to interlock with the vertical movement of the sewing needle;
An encoder for detecting the amount of rotation of the intermediate presser motor;
Sewing data storage means for storing sewing data composed of a plurality of needle entry point data in advance;
When the intermediate presser motor is driven based on the number of reference pulses for moving the intermediate presser by a reference amount, the encoder detects the needle entry point corresponding to the sewing data in a predetermined sewing product by the encoder. Pulse number detection control means for detecting the number of drive pulses corresponding to the rotation amount of the intermediate presser motor;
Pulse difference calculation means for calculating a difference between the number of drive pulses detected by the pulse detection means and the reference pulse number for driving the intermediate presser motor;
An intermediate presser height setting control means for setting the height of the intermediate presser for each needle drop point based on the difference in the number of pulses calculated by the pulse difference calculating means;
Sewing data setting control means for storing the intermediate presser height set by the intermediate presser height setting means in association with each needle drop point and reflecting it in the sewing data;
A sewing machine comprising: A thread tension mechanism that applies thread tension to the sewing thread supplied to the sewing needle;
Thread tension storage means for previously storing thread tension data for each intermediate presser height;
With
The sewing data setting control means stores the thread tension corresponding to the intermediate presser height set by the intermediate presser height setting control means in association with each needle drop point and reflects it in the sewing data. The sewing machine according to claim 1, wherein

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