KR20060116702A - Center presser device for sewing machine - Google Patents

Abstract

A center presser device for a sewing machine is provided to control the height of the bottom dead center of the center pressure without the change of the speed of a main shaft. A control member discriminates whether the setting values A and B are the same value(S300). If the setting values A and B are the same value, the control member finishes a presser foot height change process. If the setting values A and B are not the same value, the control member discriminates whether the main shaft speed change is inhibited(S301). If the main shaft speed change is not inhibited, the control member stores the setting value A in a RAM(Random Access Memory) as the present value B(S307).

Description

Center presser foot device of sewing machine {CENTER PRESSER DEVICE FOR SEWING MACHINE}

1 is a perspective view showing a sewing machine according to the present invention.

Figure 2 is an enlarged perspective view showing the vicinity of the holding frame and the center presser foot of the sewing machine according to the present invention.

3 is a side view before adjusting the center presser foot height of the center presser foot device.

4 is an exploded perspective view of the center presser foot device.

5 is another exploded perspective view of the center presser foot device.

It is a side view explaining the retraction mechanism (before retraction) of a central presser foot.

7 is a side view illustrating the retraction mechanism (during retraction) of the central presser foot.

Fig. 8 is a side view illustrating the retraction mechanism (after retraction) of the central presser foot.

9 is a side view of the center presser foot height of the center presser foot device after adjustment.

10 is a plan view showing an operation panel of the sewing machine.

It is explanatory drawing which shows the sewing pattern data of a sewing machine.

12 is an explanatory diagram showing a crotch (needle stitch shape) based on sewing pattern data.

It is explanatory drawing which shows the program pattern data of a sewing machine.

14 is a block diagram showing a control device of the sewing machine.

15 is a flowchart showing the operation of the sewing machine according to the present invention.

FIG. 16 is a flowchart showing a sewing processing operation in the flowchart of FIG. 15.

FIG. 17 is a flowchart showing a central presser foot height variable processing operation in the flowchart of FIG.

18 is a flowchart showing the spindle speed variable processing operation in the flowchart of FIG.

Explanation of symbols on the main parts of the drawings

1: center presser foot device 2: spindle

2a: spindle motor (spindle drive motor) 29: center presser foot

34: guide member 39: control shaft

42: center presser foot motor (adjustable shaft drive motor) 70: ROM

71: RAM 72: EEPROM (Memory)

73: CPU 74a: operation panel (selection means)

76a: X-axis motor 77a: Y-axis motor

100: electronic cycle sewing machine (sewing machine) 108: sewing needle

111: holding frame 113: attachment member

1000 control device (control means)

The present invention relates to a center presser foot device of a sewing machine for performing pattern forming sewing such as embroidery.

A sewing machine that performs pattern forming sewing according to input sewing data, such as embroidery sewing, and the like, which is held by an outer frame and moved in a horizontal direction (XY direction), when the sewing needle rises, The "center presser foot" of a sewing machine is known as a member which presses a sewing material so that it may not rise together.

The central presser foot moves up and down in synchronization with the sewing needle at an amplitude smaller than the sewing needle at the upper side of the sewing material, and pushes the sewing material downward when the sewing needle is pulled out of the sewing material, and during the non-sewing, It is formed so that it can be retracted upwards so as not to interfere.

However, in the pattern forming sewing of the sewing machine, the cloth thickness of the sewing material is not necessarily uniform, and when a plurality of sewing materials are overlapped, a step is formed on the surface of the sewing material, so the lowest position (bottom dead center height) during the sewing operation of the center presser foot. ) Needs to be adjusted.

For this reason, the sewing machine which connects to the center presser foot drive mechanism and rotates (manual rotation) the dial provided above the sewing machine arm part is known, and the sewing machine which adjusts the bottom dead center height of a center presser foot is known (for example, refer patent document 1). . In the center presser foot device mounted on the sewing machine, the height of the center presser foot is not adjusted during the operation of the sewing machine, and thus, the spindle feed for moving the needle bar of the sewing machine up and down is not limited. That is, the spindle speed of the sewing machine is determined by sewing data indicating the sewing shape, that is, the amount of X-Y movement per needle, and sewing speed set by sewing data or the operation panel.

However, since the center presser foot device mounted on the sewing machine operates the height adjusting dial of the center presser foot manually, it cannot respond in real time to the change in the cloth thickness during sewing. For this reason, the dial operation is performed by pulse motor driving, and further, by allowing the solenoid or the air cylinder to drive the up / down operation of the center presser foot, the bottom dead center height of the center presser foot is adjusted according to the sewing pattern even during the sewing operation. A sewing machine has been developed (see Patent Document 2, for example).

[Patent Document 1] Japanese Patent Application Laid-Open No. 9 (1997) -253365

[Patent Document 2] Japanese Patent Application Laid-Open No. 7 (1995) -178272

However, if the center presser foot device can adjust the bottom dead center height of the center presser foot even during sewing operation as in Patent Literature 2, the variable amount as much as one needle at the bottom dead center height is set in a range in which the pulse motor is not out of step. Because it had to be, it was necessary to limit the spindle speed in the adjustment. For this reason, when a spindle speed changes according to a variable amount, and a speed becomes slow, a fall of productivity may be feared by the fall of a cycle time. In addition, sewing was unstable because the spindle speed was irregular.

An object of the present invention is to improve productivity and sewing stability by adjusting the bottom dead center height of the center presser foot without changing the spindle speed.

The sewing machine of the invention according to claim 1,

The center presser foot which presses the sewing object toward the needle board, when removing the sewing needle supported by the needle bar from the sewing material,

By rotating around the axis, the sewing needle is moved up and down to move the needle bar up and down, and at the same time the main axis for moving the center presser foot up and down along the Shanghai East direction of the sewing needle,

A spindle drive motor for driving the spindle;

An adjustment shaft for adjusting the height from the needle plate when the center presser foot reaches the bottom dead center by rotating around the axis;

A control shaft drive motor for driving the control shaft;

A storage unit for storing the bottom dead center height of the central presser foot together with needle stitch data;

Control means for controlling the spindle drive motor and the adjustment shaft drive motor based on the bottom dead center height and the needle stitch data stored in the storage unit;

The control means controls the main shaft drive motor to make the main shaft speed of the main shaft constant when adjusting the bottom dead center height, and controls the driving of the regulating shaft drive motor to be divided into a plurality of needle numbers. It is characterized by.

Invention of Claim 2 is a sewing machine of Claim 1,

Selection means for inputting to the control means whether or not the adjustment of the bottom dead center height is divided into a plurality of needle numbers is provided,

The control means controls the spindle drive motor and the adjustment shaft drive motor so that the bottom dead center height is adjusted based on the input result of the selection means.

Embodiment

(Whole composition of electronic cycle sewing machine)

Embodiment of this invention is described based on FIG.

In this embodiment, the electronic cycle sewing machine will be described as an example of the sewing machine. The electronic cycle sewing machine has a holding frame as a cloth holding part for holding a cloth, which is a sewing object to be sewn, and as the holding frame moves relatively to the sewing needle, the sewing machine (preventing stitches) is applied to the fabric held in the holding frame. It is a sewing machine that forms stitches on the basis.

Here, the direction in which the sewing needle 108 to be described later moves up and down is called a Z-axis direction (up and down direction), and one direction orthogonal to this is called an X-axis direction (left and right direction), and the Z-axis direction and the X-axis The direction orthogonal to both directions of the direction is defined as the Y-axis direction (front and rear direction).

Electronic cycle sewing machine 100 (hereinafter, the sewing machine 100), the sewing machine main body 101 is provided on the upper surface of the sewing machine table (T), as shown in Figure 1, the sewing machine main body is provided below the sewing machine table (T) It is comprised by the pedal R etc. for operating (101).

(Sewing machine frame and spindle)

As shown in Fig. 1, the sewing machine main body 101 is provided with a sewing machine frame 102, the outer shape of which has a substantially o-shape when viewed from the side. The sewing machine frame 102 includes a sewing machine arm portion 102a which forms an upper portion of the sewing machine main body 101 and extends in the front and rear directions, and a sewing machine bed portion 102b which forms a lower portion of the sewing machine main body 101 and extends in the front and rear directions. And a vertical body portion 102c connecting the sewing machine arm portion 102a and the sewing machine bed portion 102b.

The sewing machine main body 101 has a power transmission mechanism disposed in the sewing machine frame 102, and has a main shaft 2 (see FIG. 4) and a lower shaft (not shown) extending in the front-rear direction so that rotation is possible. The main shaft 2 is disposed inside the sewing machine arm portion 102a, and the lower shaft (not shown) is disposed inside the sewing machine bed portion 102b.

The spindle 2 is connected to a spindle motor 2a (see Fig. 14) as the spindle drive motor according to the present invention, and is provided with a rotational force by the spindle motor 2a. In addition, the lower axis (not shown) is connected to the main shaft (2) through a vertical axis (not shown), and when the main shaft (2) is rotated, the power of the main shaft (2) is transmitted toward the lower axis through the vertical axis (not shown) The lower shaft is rotated.

A needle bar 108a moving up and down in the Z-axis direction is connected to the front end of the main shaft 2, and sewing is performed at the lower end of the needle bar 108a as shown in FIG. A needle 108 is provided.

Moreover, the encoder 2b (refer FIG. 14) is provided in the drive take-out shaft or main shaft of the spindle motor 2a. The encoder 2b detects the rotation angle of the main shaft of the main shaft motor 2a. For example, the encoder 2b outputs a pulse signal to the control device 1000 (control means) whenever the main shaft of the main shaft motor 2a rotates by 1 °. It is. In addition, with one rotation of the main shaft 2, the needle bar 108a makes one reciprocating motion.

In addition, a kiln (not shown) is provided at the front end of the lower shaft (not shown). When the lower shaft rotates together with the main shaft 2, needle stitches are formed by the cooperation of the sewing needle 108 and the kiln (not shown).

In addition, since the connection structure of the main shaft motor 2a, the main shaft 2, the needle bar 108a, the sewing needle 108, the lower shaft (not shown), the kiln (not shown), etc. is the same as that of a conventionally well-known thing, in detail here, Do not explain.

(Center presser foot device)

As shown in FIG. 3, inside the sewing machine arm part 102a, the central presser foot device 1 which suppresses the fluttering of the cloth as a sewing material is arrange | positioned, and the sewing machine bed as shown in FIG. 1 and FIG. The needle plate 110 is disposed on the portion 102b. Here, the central presser foot device 1, in order to prevent the fabric from being lifted due to the shanghaidong of the sewing needle 108, moves up and down in conjunction with the shanghaidong of the needle bar (108a), around the sewing needle 108 The center presser foot 29 which presses the cloth toward the needle plate is provided.

Moreover, above the needle plate 110, the holding frame 111 and the sewing needle 108 which are mentioned later are arrange | positioned. The sewing needle 108 is arranged to pass through holes formed in the tip of the center presser foot 29.

The holding frame 111 is attached to the attachment member 113 disposed at the front end of the sewing machine arm portion 102a, and the attachment member 113 is the X-axis motor 76a disposed in the sewing machine bed portion 102b. And the Y-axis motor 77a are connected as drive means (see FIG. 14). Then, the holding frame 111 is moved in accordance with the driving of the X-axis motor 76a and the Y-axis motor 77a while maintaining the cloth, in a direction orthogonal to the shank east direction of the sewing needle 108 (horizontal direction). It is supposed to convey the cloth. By moving the holding frame 111 and the operation of the sewing needle 108 and the kiln (not shown), the needle stitches are formed on the fabric based on the needle stitching data of the predetermined sewing pattern data.

In addition, the holding frame 111 is composed of a cloth pressing portion (not shown) and a lower plate (not shown), and the attachment member 113 is used to drive the cloth pressing portion motor 79b disposed in the sewing machine arm portion 102a. As a result, it is possible to drive up and down, and to hold the cloth between the lower plate and the lower plate when the cloth presses are lowered.

The pedal R drives the sewing machine 100 and operates as an operation pedal for moving the needle bar 108a (the sewing needle 108) up and down, or for operating the holding frame 111. That is, the pedal R includes a sensor composed of, for example, a variable resistor for detecting the step of stepping on which the pedal R is stepped, and the output signal from the sensor is an operation signal of the pedal R. It is output to the control device 1000 to be described later, the control device 1000 is configured to operate by operating the sewing machine 100 in accordance with the operation position, the operation signal.

The center presser foot device 1 is provided in the main shaft 2 which drives the needle bar 108a provided with the sewing needle 108 in the up-down direction, as shown in FIGS. An eccentric cam 3 is fixed to the main shaft 2, and a connecting link 4 is connected to the eccentric cam 3. The oscillation shaft holder 5 is connected to the connection link 4, and one end of the oscillation shaft 6 is connected to the oscillation shaft holder 5.

3 to 5, the proximal end of the center presser foot adjustment arm 7 for adjusting the amount of movement of the center presser foot in the vertical direction D1 is fixed to the other end of the swing shaft 6. A groove cam 7a is formed in the central presser foot adjustment arm 7. The groove cam 7a is an arc-shaped long hole, and the desired position of the groove cam 7a and one end of the first link 8 are rotated by the adjusting nut 9 and the stepped screw 10. This is fixed freely. The fixed position is formed from a position intersecting the axis line of the swing shaft 6 to a range of a predetermined position on one end side of the center presser foot adjustment arm 7 at this intersection position, and within this range, it can be adjusted as desired. have.

The other end part of the 1st link 8 is connected so that rotation is free by the length part of the 2nd link 11, and the stepped screw 12. As shown in FIG. In addition, the groove cam 7a to which the adjusting nut 9 is engaged is centered on the shaft center of the stepped screw 12 when the center presser foot 29 is at the bottom dead center of the vertical reciprocating motion. Be part of an arc. The positioning link 13 is connected to the back side of the second link 11.

The positioning link 13 is attached to the sewing machine frame 102 as the sewing machine housing freely by a stepped screw 14 near its central portion, and the position of the stepped screw 14 is determined by the center presser foot 29. This coincides with the position of the stepped screw 12 at the bottom dead center.

A spring hanger 13a is formed at one end of the positioning link 13, a spring hanger 15a is fixed to the sewing machine frame 102, and a coil spring 16 is interposed between these spring hangers. The one end of the positioning link 13 to which 13a is attached is pressed down to pull down. That is, the coil spring 16 presses the connection part P1 downward when the connection part P1 with the 3rd link 20 in the 2nd link 11 as a center presser foot rocking part moved upwards. It functions as a pressurizing means. A stopper 17 is connected to the other end of the positioning link 13, and connected to one end of the second link 11 and the other end of the positioning link 13 by one end screw 18. It is. In addition, the stopper 17 is attached to the sewing machine frame 102 together with the positioning link 13 by the stepped screws 14 so as to be free to rotate. Above the one end 17a of the stopper 17, a restricting member 19 is provided to restrict the stopper 17 from rotating upward. In addition, the restriction member 19 may be substituted as a part of the sewing machine frame (102). Then, the center presser foot rocking mechanism M1 is configured by the first link 8, the second link 11, and the positioning link 13.

One end of the third link 20 is connected to the other end of the second link 11 so that rotation is free by the stepped screw 21. Rotation is freely connected to the other end of the third link 20 so that one end of the fourth link 22 is in series with the longitudinal direction of the third link 20 by a stepped screw 23. The center presser foot link member 24 is formed by the third link 20 and the fourth link 22.

The link relay plate 25 is connected to the other end of the fourth link 22 by a stepped screw 26. A center presser foot holder 27 is fixed to the link relay plate 25, and a center presser foot stand 28 extending in the vertical direction is held in the center presser foot holder 27. At the lower end of the center presser foot stand 28, a center presser foot 29 is attached to press the fabric onto the needle plate during sewing. The coil spring 30 is provided in the upper end of the center presser foot stand 28, and is attached to the center presser foot holder 27 by the bolt 31 and the nut 32. As shown in FIG.

The stepped screw 23 connects the third link 20 and the fourth link 22 together with the square piece 33 and the guide member 34. That is, the guide member 34 is provided on the front side of the fourth link 22, and the square piece 33 is installed on the front side of the guide member 34, and the third link 20, The four links 22, the square pieces 33, and the guide member 34 are connected with one step screw 23.

The square piece 33 serves as a spacer to fill the gap between the stepped screw 23 and the connecting portion P3 of the third link 20 and the fourth link 22, and the spasm of each link is rattled. To smoothly drive each member.

The guide member 34 is a substantially triangular plate member, and the upper end portion 34t is rotatably attached to the sewing machine frame 102 by a stepped screw 35. In the vicinity of the lower end of the guide member 34, a hole 34a having a long length in the vertical direction is formed. The long hole 34a is formed to have a width slightly larger than the diameter of the threaded portion of the stepped screw 23, and the stepped screw 23 is inserted into the long hole 34a. That is, the guide member 34 allows the connecting portion P3 of the third link 20 and the fourth link 22 to move in the up-down direction D1 of the center presser foot 29, and further, the third link ( The movement in the direction D3 across the series direction D2 of the 20 and the fourth link 22 is regulated.

In addition, one end of the moving link 36 as a moving means for moving the guide member 34 in a direction crossing the series direction of the third link 20 and the fourth link 22 is provided in the guide member 34. The stepped screw 37 is connected so that rotation is free in the upper vicinity of the long hole 34a. An eccentric cam 38 is connected to the other end of the movable link 36, and the eccentric cam 38 rotates about an axis from the needle plate 110 when the center presser foot 29 reaches the bottom dead center. One end of the adjustment shaft 39 for adjusting the height (center presser foot height) is connected. The other end of the adjustment shaft 39 is connected to the center presser foot motor 42 as the adjustment shaft drive motor through the bearing 40 and the bevel gear 41. That is, since the driving of the center presser foot motor 42 is transmitted in the order of the adjusting shaft 39, the eccentric cam 38, and the moving link 36, the moving link 36 moves the guide member 34. The center presser foot motor 42, the guide member 34, and each structure which transmits power between them adjust the height of the center presser foot 29 using the center presser foot motor 42 as a drive source.

The bevel gear 43 meshes with the bevel gear 41, and the drive of the center presser foot motor 42 can be output in the direction D5 orthogonal to the axial direction of the adjustment shaft 39. At the rear end of the bevel gear 43, a bearing 44, a central presser foot lifting cam 45, and the like are connected coaxially.

As shown in Figs. 6 to 8, the center presser foot lifting cam 45 is formed in the shape of an arc having a substantially equal distance from the center of rotation to the outer circumferential surface on the center line passing through the center of rotation (hereinafter, The holding portion 45a), and the other side is a shape in which the distance from the center of rotation to the outer circumferential surface is larger than the distance from the center of rotation to the outer circumferential surface of the holding portion 45a, and changes smoothly (hereinafter, the change portion 45b). Is).

The center presser foot lifting cam 45 lifts the center presser foot raising member 46 which raises the center presser foot 29 to the retraction height position P5 after finishing sewing, and at one end of the center presser foot raising member 46. The outer peripheral surface of the center presser foot lifting cam 45 abuts on the outer peripheral surface of the cylindrical roller 47 provided. That is, when the holding part 45a of the center presser foot lifting cam 45 is in contact with the roller 47, the center presser foot raising member 46 does not rise (see Fig. 6), but the center presser foot lifting cam 45 The center presser foot raising member 46 is made to rise when the change part 45b of the abutment contact | abuts the roller 47 (refer FIG. 7 and FIG. 8). That is, the center presser foot retraction mechanism M2 is comprised by the center presser foot lifting cam 45, the center presser foot raising member 46, and the roller 47. As shown in FIG.

The center presser foot raising member 46 is attached to the sewing machine frame 102 by a pin 48 at its intermediate portion so as to be free to rotate. The center presser foot raising member 46 is provided so that the other end thereof is located below the center presser foot holder 27, and the change portion 45b of the center presser foot lifting cam 45 abuts against the roller 47. By raising the other end of the center presser foot raising member 46, the center presser foot holder 27 can be raised to raise the center presser foot 29 to the retracted height position P5 (see Fig. 8). In addition, a spring hook 49 is provided on the sewing machine frame 15 so as to be located above the center presser foot lift member 46, and one end of the coil spring 50 is hung on the spring hook 49, and the other The end part is caught in the vicinity of one end of the center presser foot raising member 46. As a result, one end of the central presser foot raising member 46 is always urged upward.

Next, the operation of the center presser foot device 1 having the above-described configuration will be described based on FIGS. 3 to 8.

When the main shaft 2 or the eccentric cam 3 are rotated by driving the main shaft motor 2a, the front end of the connecting link 4 is in a direction orthogonal to the axis of the main shaft 2 (the third link 20 and the first). It swings in the direction D3 crossing the series direction D2 of the four links 22, and the swing shaft holder 5 connected to the connection link 4 also swings in the same direction. As the swing shaft holder 5 swings, the swing shaft 6 also swings, so that one end of the first link 8 is the swing point and the other end of the first link 8 is the axis of the swing shaft 6. It swings in the direction orthogonal to the direction (direction D3 intersecting with respect to the serial direction D2 of the third link 20 and the fourth link 22). According to the swing of the other end of the first link 8, the other end of the second link 11 swings in the series direction D2 of the third link 20 and the fourth link 22, and the second link The third link 20 and the fourth link 22 connected to the other end of (11) swing in the series direction (up-down direction; D2). In accordance with the fluctuations of the third link 20 and the fourth link 22, the center presser foot 28 connected to the fourth link 22 moves downward along the up-down direction D1, so that the center presser foot 29 ) Moves up and down. That is, by rotating the main shaft 2 in the axial direction, the center presser foot 29 moves up and down along the shanghai east direction of the sewing needle 108.

Next, the adjustment operation of the center presser foot height position P4 by the center presser foot device 1 having the above-described configuration will be described based on FIGS. 3 to 9.

When the CPU 73 of the control apparatus 1000 described later executes the control program, the center presser foot motor 42 starts driving based on the sewing pattern data and the center presser foot height data stored in the EEPROM 72 described later. do.

The drive of the central presser foot motor 42 is transmitted to the adjusting shaft 39 through the bevel gear 41 and the bearing 40, and the adjusting shaft 39 starts to rotate. The eccentric cam 38 also rotates in accordance with the rotation of the adjustment shaft 39, and the movable link 36 is in a direction substantially orthogonal to the axis of the adjustment shaft 39 (the third link 20 and the fourth link 22). Rocking in the direction D3 crossing the series direction D2. By oscillation of the movable link 36, the guide member 34 swings in the direction D3 transverse to the series direction D2 of the third link 20 and the fourth link 22.

At this time, as shown in FIG. 9, the stepped screw 23 of the connection part P3 of the 3rd link 20 and the 4th link 22 connected with the elongate hole 34a of the guide member 34 is the screw. Since the portion of the third link 20 and the fourth link 22 are restricted in the direction D3 intersecting with the serial direction D2 by the long hole 34a, the portion is transmitted by swinging. Since there is no place to release the force, the stepped screws 23 move upward along the long hole 34a, and as the stepped screws 23 move along the guide member 34, they are connected side by side in series. The angle (theta) which the 3rd link 20 and the 4th link 22 which were existed changes, and the center presser foot link member 24 becomes roughly shaped. When the center presser foot link member 24 is approximately shaped, the distance L between both ends of the center presser foot link member 24, that is, one end of the third link 20 and the other end of the fourth link 22. The distance L between them becomes short, and the center presser foot 29 moves upward along the up-down direction D1. Thereby, the center presser foot height position P4 from the needle plate of the center presser foot 29 can be adjusted.

(Sewing machine control system: full overview)

In addition, the sewing machine 100 (the sewing machine main body 101), as shown in Figs. 1 and 10, the operation panel 74a for the operator to perform various setting operations for the sewing machine or input operation of various data, etc .; ) The operation panel 74a and the sewing machine main body 101 are connected by a wired or wireless line (not shown).

The operation panel 74a includes a plurality of groups of operation keys capable of various settings of the sewing machine, various data input operations, a data display portion 74d for displaying various setting states, and the like.

As shown in Fig. 10, the operation panel 74a includes a data display section 74d, a ready key 74e, a reset key 74f, a + / forward key 74g, a-/ retract key 74h, and a pattern No. Key 74i, X zoom factor key (74j), Y zoom factor key (74k), speed key (74l), center presser foot height key (74m), shift selector key (74n), program key ("Pr1", " Pr2 ", " Pr3 ", " Pr4 ";

The data display portion 74d displays a portion where the LED 91 is lit, various data numbers corresponding to the keys, data values, and the like.

The preparation key 74e is a key for performing an operation for confirming the data or numerical value changed by the + / forward key 74g, the-/ retract key 74h, or the like.

The reset key 74f is a key for performing an operation for resetting data or numerical values changed by the + / forward key 74g, the − / retract key 74h, or the like.

The + / forward key 74g and the − / retract key 74h are keys for performing operations for changing various data numbers and data values (forward transfer; +, reverse transfer;-).

The pattern No. key 74i retrieves sewing pattern data corresponding to the sewing pattern data in order to select desired sewing pattern data, for example, when sewing by sewing pattern data that is set and stored in advance. The key for displaying the sewing pattern No. In addition, sewing pattern data is mentioned later.

The X magnification reduction key 74j and the Y magnification reduction key 74k are keys for setting input and display of the magnification factor of the X and Y axis components of the pattern, respectively, when the sewing pattern is executed.

The speed key 74l is a key for setting input and display of the spindle speed at sewing.

The center presser foot height key 74m is a key for setting input and display of the height of the center presser foot 29 of the center presser foot device 1 at the time of sewing.

The shift switching key 74n is a switching key for determining whether to shift the spindle speed during sewing.

Program key (Pr1, Pr2, Pr3, Pr4; 74o) is a combination of sewing pattern data, zoom factor, spindle speed, center presser foot height, etc. Program pattern data).

In addition, various data such as sewing data and program pattern data set and input through various keys on the operation panel 74a are output to the control apparatus 1000 described later and stored in the EEPROM 72 described later.

(Control system of the sewing machine: Sewing pattern)

Here, the sewing pattern will be described.

The sewing pattern is a sewing pattern at the time of sewing, and the data of the X-direction movement amount and the Y-direction movement amount (needle stitch data indicating the needle drop position) when the holding frame 111 is moved in order to execute the movement pattern. ) Is represented by sewing pattern data in which a plurality of combinations are made. 11 and 12 show actual sewing pattern data and an example of a sleeping pattern. When a crochet is made according to the sewing pattern data of pattern No. 1 shown in Fig. 11 from the origin position (0, 0), the crotch is shown in Fig. 12, and needle stitches are formed.

In the sewing pattern data shown in Fig. 11, preliminary feed (1), preliminary feed (2), preliminary feed (3). The sewing 16 and the sewing 17 are data (parameters) of the X-direction moving amount and the Y-direction moving amount when the holding frame 111 is moved. That is, the rotational drive amounts of the X-axis motor 76a and the Y-axis motor 77a at the time of sewing are determined by these.

In the "preliminary transfer", the needle bar 108a (the sewing needle 108) does not operate, and only the holding frame 111 moves, and in the "sewing", the needle bar 108a (the sewing needle 108 together with the holding frame 111). )) Is operated to form needle stitches.

In addition, "thread cutting" is a thread cutting device (not shown), and "end" is a command for the operation of the sewing machine 100, and numerical value setting for the operation is unnecessary, so that numerical data is not set ( (0) in Fig. 11)

In addition, "center presser foot height" is an instruction | command about the operation | movement of the center presser foot device 1, and contains numerical data about the operation | movement.

That is, the height of the center presser foot 29 at the phase (180 °) of the bottom dead center of the sewing needle 108 defined by the rotation angle of the spindle motor 2a by the set value of the "center presser foot height", that is, the center The rotation angle position of the presser foot motor 42 is determined.

In addition, the notation in the numerical data of the X movement amount, Y movement amount, and center presser foot movement amount of FIGS. 11 and 12 is 10 times notation, for example, "15" represents "1.5 mm".

(Control system of the sewing machine: program pattern)

Next, the program pattern will be described.

As shown in FIG. 13, arbitrary sewing pattern data to be sewn is selected, and the X magnification rate and Y for increasing and decreasing the X moving amount and Y moving amount of each of the "preliminary transfer" and "sewing" commands among the sewing patterns are shown in FIG. The enlargement / reduction ratio is numerically set, and the spindle speed, which is the rotational speed of the spindle motor 2a during sewing, and the bottom dead center height of the central presser foot 29 as the reference during sewing (however, the center presser foot height is set in the sewing pattern). In this case, the sewing pattern is given priority), and the numerical value is set, and the correction amount of the oscillation amplitude of the central presser foot 29, which is a reference during sewing, is provided. Priority) is set numerically.

When the program pattern data is executed, the X moving amount and the Y moving amount are adjusted with respect to the sewing pattern recorded in the selected program pattern, and sewing is performed at the set spindle speed, the center presser foot height, and the amplitude adjusting amount.

In addition, in the control apparatus 1000 described later, four program pattern data can be stored in the EEPROM 72, and the program keys (" Pr1 ", " Pr2 ", " Pr3 " And " Pr4 "; 74o) respectively.

(Control system of sewing machine: control device)

The sewing machine 100 is provided with the control apparatus 1000 for controlling the operation | movement of each part and each member mentioned above as shown in FIG.

As shown in FIG. 14, the control device 1000 includes a ROM 70, a RAM 71, an EEPROM 72, and a CPU 73.

The ROM 70 (PROM) stores and stores control programs, control data, and various sewing data of the sewing machine 100 (the sewing machine main body 101).

The RAM 71 is provided with various working memories, counters, and the like, and is used as a work area during sewing operations or data processing, and temporarily stores programs, data, and the like read from the ROM 70 or the EEPROM 72. will be.

The EEPROM 72 stores input various data and various parameters.

In particular, the EEPROM 72 is a storage unit according to the present invention, which is sewing pattern data (for example, sewing pattern data of pattern No. 1 in FIG. 11) formed by combining a plurality of needle stitch data input through the operation panel 74a. Etc.) and program patterns are memorized.

The EEPROM 72 also stores data of X magnification and Y magnification, spindle speed data, center presser foot height data, and the like.

Further, the EEPROM 72 stores program pattern data (e.g., program pattern data " in FIG. 13 ") in which these sewing pattern data, data of X magnification and Y magnification, data of main axis speed, center presser foot height data, etc. are combined. Pr1 "," Pr2 "," Pr3 "," Pr4 "), and the like.

The CPU 73 uses the RAM 71 as a work area (work area) to perform various operation processes, arithmetic processing, and the like based on the control program stored in the ROM 70.

In addition, the CPU 73 is connected to the operation panel 74a via the interface 74, and selects and changes the sewing pattern data based on data input through the operation panel 74a. Here, when a signal for enabling a shift is input from the shift selector key 74n of the operation panel 74a, the CPU 73 shifts the spindle speed and the bottom dead center height of the center presser foot 29 by one needle. The main shaft motor 2a and the center presser foot motor 42 are controlled to be adjusted. On the other hand, when a signal forbidding the shift is input from the shift switching key 74n of the operation panel 74a, the CPU 73 divides the main shaft speed into a plurality of needle numbers in a constant state to form the center presser foot 29. The main shaft motor 2a and the center presser foot motor 42 are controlled so that the bottom dead center height of the main body is adjusted.

In addition, the CPU 73 is connected to the cloth presser switch 74b and the start switch 74c via the interface 74, and an instruction signal is input from the cloth presser switch 74b and the start switch 74c. In this case, a process of sewing is performed on each part of the sewing machine 100 based on the above-mentioned sewing pattern data or the like.

In addition, the CPU 73 is connected to the main shaft motor drive circuit 75b for driving the main shaft motor 2a through the interface 75 to control the rotation of the main shaft motor 2a, thereby driving a drive mechanism (for example, sewing). The needle bar 108a to which the needle 108 is attached, the main shaft 2, etc.) is controlled. Moreover, the spindle motor 2a is provided with the encoder 2b, and is output by every rotation of the spindle motor 2a from the encoder 2b in the spindle motor drive circuit 75b which drives the spindle motor 2a. The Z-phase signal is input to the CPU 73 via the interface 75, and the CPU 73 can recognize the origin (0 ° position) in one rotation of the main shaft 2 by this signal. Can be. In addition, from the encoder 2b, the A phase signal output at every 1 ° at the rotational angle of the main shaft motor 2a is input to the CPU 73 via the interface 75 to refer to the Z phase signal described above. By counting the number of pulses of the A-phase signal, the CPU 73 can recognize the current rotation angle of the main shaft (2).

In addition, for example, a servo motor can be applied to the main shaft motor 2a.

In addition, the CPU 73 drives the X-axis motor 76a and the Y-axis motor 77a which are provided in the holding frame 111 for holding the cloth to be sewn through the interface 76 and the interface 77, respectively. It is connected to the axial motor drive circuit 76b and the Y-axis motor drive circuit 77b to control the operation in the X-axis direction and the Y-axis direction of the holding frame 111.

In addition, the CPU 73 drives the center presser foot motor driving circuit for driving the center presser foot motor 42 which adjusts the height position of the center presser foot 29 separately from the vertical movement by the spindle motor 2a through the interface 78. It is connected to 78b and controls the operation of the center presser foot device 1.

In addition, the CPU 73 is connected to the cloth presser motor driving circuit 79b for driving the cloth presser motor 79a for moving the cloth presser (not shown) up and down through the interface 79. Control the operation of the press.

In addition, for example, a pulse motor can be applied to the X-axis motor 76a, the Y-axis motor 77a, the center presser foot motor 42, and the cloth presser motor 79a.

In addition, the CPU 73 is connected to the X-axis origin sensor 80a and the Y-axis origin sensor 80b for detecting the home position of the holding frame 111 through the interface 80, and the holding frame 111 is connected to the CPU 73. A signal indicating whether or not it has returned to this home position is input, and control is performed based on the signal.

In addition, the CPU 73 is connected to the center presser foot origin sensor 80c for detecting the home position of the center presser foot 29 of the center presser foot device 1 via the interface 80, and the center presser foot device 1. A signal indicating whether or not the central presser foot 29 is located in the normal arrangement is input, and control is performed based on the signal.

In addition, the CPU 73 is connected to the cloth pressing part home sensor 80d for detecting the home position of the cloth pressing part (not shown) via the interface 80, and it is determined whether the cloth pressing part is returned to the home position. A signal indicating whether or not is input, and control is performed based on the signal.

(Explanation of overall operation of the main sewing machine)

Next, operation | movement of the sewing machine 100 which concerns on this invention is demonstrated based on the flowchart shown in FIG.

First, the main power supply (not shown) of the sewing machine 100 is operated ON, and in the state where the sewing machine 100 is activated, program keys ("Pr1", "Pr2", "Pr3", "Pr4"); When the control device 1000 detects the signal of pressing 74o (step S101; Yes), the control device 1000 determines a predetermined value according to the pressed program key 74o from the program pattern data stored in the EEPROM 72. Program pattern data is selected, extracted, expanded to RAM 71, and set (step S102).

Then, when the control apparatus 1000 does not detect the signal in which the program key 74o is pressed (step S101; No), or after setting the program pattern in step S102, the control proceeds to step S103.

Subsequently, the controller 1000 determines the pattern No. key 74i, the X zoom factor key 74j, the Y zoom factor key 74k, the speed key 74l, the center presser foot height key 74m, and the shift switching key ( When the signal 74n) is pressed (step S103; Yes), the control apparatus 1000 displays the setting contents or setting data corresponding to each key on the data display portion 74d, and lights the corresponding LED 91. (Step S104).

Then, the control apparatus 1000 includes a pattern No. key 74i, an X zoom factor key 74j, a Y zoom factor key 74k, a speed key 74l, a center presser foot height key 74m, and a shift switching key. When the signal to which 74n is pressed is not detected (step S103; No), or after the operation in step S104, the process proceeds to step S105.

Subsequently, when the control device 1000 detects a signal in which the + / forward key 74g and the − / retract key 74h are pressed (step S105; Yes), the control device 1000 displays the data display part 74d. The set contents and setting data are updated (step S106).

Then, when the control apparatus 1000 does not detect a signal in which the + / forward key 74g and the − / retract key 74h are pressed (step S105; No), or after the setting update in step S106, the process goes to step S107. To fulfill.

Subsequently, the control apparatus 1000 monitors whether the preparation key 74c is operated, and when the control apparatus 1000 does not detect a signal in which the preparation key 74c is pressed (step S107; No) The flow returns to step S101. On the other hand, when the control apparatus 1000 detects the signal in which the preparation key 74c is pressed (step S107; Yes), the setting updated in step S106 is confirmed, and the flow proceeds to step S108.

Subsequently, the control apparatus 1000 determines that the pattern No., X enlargement reduction rate, Y enlargement reduction ratio, sewing machine speed, and center presser foot height of the program selected and set in step S102 are changed (step S108; Yes). The data of the program pattern is written into the EEPROM 72 (step S109), and the flow proceeds to step S112. On the other hand, if the control device 1000 determines that the program has not been changed (step S108; No), the process proceeds to step S110.

Then, the control apparatus 1000 determines whether or not the data of the shift switching is changed (step S110).

If the control apparatus 1000 determines that the data of the shift shift has been changed (step S110; Yes), the control apparatus 1000 writes the changed new shift shift data into the EEPROM 72 (step S111). On the other hand, when the control apparatus 1000 determines that the data of the shift switching is not changed (step S110; No), or the data writing in step S111, the process proceeds to step S112.

Subsequently, the control apparatus 1000 drives the cloth pressing unit motor 79a to perform a home search for moving the cloth pressing unit (not shown) to the detection position of the cloth pressing unit origin sensor 80d (step S112). . Also, the origin position of the cloth pressing portion is the cloth pressing portion falling position.

In addition, the control apparatus 1000 drives the center presser foot motor 42 to perform home search for moving the center presser foot to the detection position of the center presser foot origin sensor 80c (S113). The origin position of the center presser foot is the center presser foot rising position.

In addition, the control apparatus 1000 drives the X-axis motor 76a and the Y-axis motor 77a to move the holding frame 111 to the detection position of the X-axis origin sensor 80a and the Y-axis origin sensor 80b. After performing the origin search to move, the holding frame 111 is moved to the sewing start position of the selected sewing pattern data (step S114).

And the control apparatus 1000 drives the cloth pressing part motor 79a, and raises a cloth pressing part (not shown) (step S115).

Subsequently, the control apparatus 1000 determines whether the cloth pressing part SW 74b is pressed (step S116).

When the control apparatus 1000 does not detect the signal to which the cloth pressing part SW 74b was pressed (step S116; No), it returns to step S116. On the other hand, when the control apparatus 1000 detects the signal to which the cloth pressing part SW 74b is pressed (step S116; Yes), the cloth pressing part motor 79a is driven, and the cloth pressing part (not shown) is carried out. (Step S117).

In addition, the control apparatus 1000 determines whether the cloth pressing part SW 74b is pressed (step S118).

When the control apparatus 1000 detects the signal pressed by the cloth pressing part SW 74b (step S118; Yes), the cloth pressing part motor 79a is driven to raise the cloth pressing part (not shown). (Step S119), the process returns to step S116. On the other hand, when the control apparatus 1000 does not detect the signal to which the cloth pressing part SW 74b was pressed (step S118; No), it progresses to step S120.

Subsequently, the control apparatus 1000 determines whether the start SW 74c is pressed (step S120).

When the control apparatus 1000 does not detect the signal to which the start SW 74c was pressed (step S120; No), it returns to step S118. On the other hand, when the control apparatus 1000 detects the signal in which the start SW 74c is pressed (step S120; Yes), the sewing operation is performed (step S121), and the process proceeds to step S122 after the processing ends. .

Then, the control apparatus 1000 drives the X-axis motor 76a and the Y-axis motor 77a to move the holding frame 111 from the sewing end position to the sewing start position (step S122).

Further, the control apparatus 1000 drives the cloth pressing unit motor 79a, raises the cloth pressing unit (not shown) (step S123), and returns to step S116, so that the sewing operation is repeated.

Next, the sewing operation processing in step S121 will be described based on the flowchart shown in FIG.

First, the control apparatus 1000 determines whether the next data in the selected sewing pattern data is the end data (step S201).

If it is determined that the next data is the end data (step S201; Yes), the control apparatus 1000 ends the sewing operation processing (subroutine) and returns to the main routine. On the other hand, if it is determined that the next data is not the end data (step S201; No), the control apparatus 1000 determines whether the next data is preliminary transfer data (step S202).

If it is determined that the next data is preliminary feed data (step S202; Yes), the control device 1000 drives the X-axis motor 76a and the Y-axis motor 77a based on the X-shift amount and the Y-shift amount of the preliminary feed data. The holding frame 111 is moved (step S203). On the other hand, when it is determined that the next data is not preliminary transfer data (step S202; No), or when the movement of the holding frame 111 of step S203 is completed, the control device 1000 determines whether the next data is the central presser foot data. It is judged whether or not (step S204).

If it is determined that the next data is the center presser foot data (step S204; Yes), the control device 1000 stores the center presser foot data as the set value A in the RAM 71 (step S205). On the other hand, when it is determined that the next data is not the central presser foot data (step S204; No), or when the storage of step S205 is completed, the control apparatus 1000 determines whether the next data is sewing data (step S206). ).

If it is determined that the next data is not sewing data (step S206; No), the control apparatus 1000 returns to step S201. On the other hand, if it is determined that the next data is sewing data (step S206; Yes), the control device 1000 stores the setting value A as the present value B in the RAM 71 and lowers the center presser foot to the present value B. (Step S207).

After that, the controller 1000 stores 2500 rpm as the spindle speed D in the RAM 71, and outputs the spindle speed command and the rotation command output of the spindle speed D to the spindle motor 2a (step). S208).

Subsequently, the control apparatus 1000 determines the presence or absence of a signal indicating that the needle has come down (step S209). If a signal indicating that the needle has come down is not detected (step S209; No), the process proceeds to step S209, and if detected (step S209; Yes), the process proceeds to step S210.

The control apparatus 1000 determines whether the next data is actual cut data (step S210). If it is determined that the next data is thread cutting data, the control device 1000 outputs the thread cutting command to the thread cutting device (not shown) to cut the thread, and outputs the sewing machine stop command by turning the sewing machine rotation command off ( Step S211), the sewing needle 108 waits until the needle stops at the raised position (step S212).

When the main shaft 2 stops and it is determined that the sewing machine 100 has stopped (step S212; Yes), the control device 1000 operates the center presser foot motor 42 to move the center presser foot 29 to a predetermined height. It raises and arrange | positions to a standby position (step S213), and returns to step S201.

If it is determined in step S210 that the next data is not the actual cutting data (step S210; No), the control device 1000 determines whether the next data is the central presser foot data (step S214). If it is determined that the next data is the center presser foot data (step S214; Yes), the control device 1000 stores the center presser foot data as the set value A in the RAM 71 (step S215). On the other hand, when it is determined that the next data is not the central presser foot data (step S214; No), or when the storage of step S215 is completed, the control apparatus 1000 proceeds to step S216.

In step S216, the control device 1000 waits for the needle bar 108a to go to a predetermined XY drive timing position (for example, 250 degrees) from under the needle, and in step S217, the control device 1000 moves to the XY drive timing position. The X-axis motor 76a and the Y-axis motor 77a are driven by the X moving amount and the Y moving amount.

Thereafter, the control apparatus 1000 waits from the bottom of the needle to the predetermined center presser foot driving timing position (for example, 270 degrees) from the bottom of the needle (step S218), and then the control apparatus 1000 The center presser foot variable processing is called out (step S219).

Subsequently, the control apparatus 1000 waits from the lower side of the needle to the predetermined spindle speed change timing position (for example, 110 degrees past 360 degrees) after the needle bar 108a (step S220), and then the control apparatus 1000. ) Calls up the spindle speed change timing (step S221), and returns to step S209.

Next, the center presser foot height variable processing in step S219 will be described based on the flowchart shown in FIG. 17.

First, the control apparatus 1000 determines whether the set value A and the present value B are the same value (step S300). If it is determined to be the same (step S300; Yes), the control apparatus 1000 ends the center presser foot height variable processing (subroutine) and returns to the main routine. On the other hand, if it judges that it is another value (step S300; No), the control apparatus 1000 determines whether spindle speed shifting is prohibited (step S301). At this time, what is used as the criterion of determination is the shift switching data set by the shift switching key 74n and stored in the EEPROM 72. If the data shift of the shift switching is not prohibited, the control apparatus 1000 stores the setting value A as the current value B in the RAM 71 (step S307) and proceeds to step S304.

On the other hand, if the input signal prohibits shifting, the control apparatus 1000 determines whether the value obtained by subtracting the present value B from the set value A is greater than 20 (step S302), and is greater than 20 (step S302; Yes), the value obtained by adding 20 to the previous present value B is stored as a new present value B in the RAM 72 (step S303), and the process proceeds to step S304. If it is 20 or less (step S302; No), it is determined whether the value obtained by subtracting the present value B from the set value A is smaller than -20 (step S305), and if smaller than -20 (step S305; Yes), The value obtained by subtracting 20 from the present value B is stored as a new present value B in the RAM 72 (step S306), and the process proceeds to step S304. If the value is -20 or more (step S305; No), the setting value A is stored as a new present value B in the RAM 72 (step S307), and the processing proceeds to step S304.

In step S304, the controller 1000 controls the spindle motor 2a and the center presser foot motor 42 so that the bottom dead center height of the center presser foot 29 is adjusted to a new present value B stored in the RAM 72. . Accordingly, when the difference between the set value A and the present value B exceeds ± 20, the height of the bottom dead center of the center presser foot 29 is adjusted within ± 20 of the variable amount within one needle. In this embodiment, 20 is used as a reference value for dividing the adjustment of the bottom dead center height of the center presser foot 29. However, the reference value is not limited to this value, and at least the spindle motor 2a is not removed. It is preferable to set a variable amount to a reference value.

Next, the main shaft speed variable process in step S221 of FIG. 16 is demonstrated based on the flowchart shown in FIG.

First, the control apparatus 1000 determines whether the spindle speed shift is prohibited (step S400). At this time, what is used as the criterion of determination is the shift switching data set by the shift switching key 74n and stored in the EEPROM 72. If the data of the shift switching prohibits the shift, the control apparatus 1000 ends the spindle speed variable processing (subroutine) and returns to the main routine. On the other hand, if the data of the shift switching does not prohibit the shift, the control apparatus 1000 determines whether the data following one needle (the next data of the next data) is the center presser foot height data.

If it is determined that the data after the one needle is the center presser foot height data (step S401; Yes), the control device 1000 changes the absolute value of the value obtained by subtracting the present value B from the center presser foot height data after the one needle to the variable amount C. To be stored in the RAM 72 (step S402).

Then, the control apparatus 1000 determines whether the variable amount C is greater than 20 (step S403). If it is determined that the variable amount C is 20 or less (step S403; No), the control apparatus 1000 ends the spindle speed variable processing (subroutine) and returns to the main routine. On the other hand, when it is determined that the variable amount C is greater than 20 (step S403; Yes), the control apparatus 1000 determines whether the variable amount C is greater than 30 (step S404).

If it is determined that the variable amount C is 30 or less (step S404; No), the control apparatus 1000 stores 2200 rpm as the spindle speed D in the RAM 71 (step S405), and the process proceeds to step S407. On the other hand, when it is determined that the variable amount C is larger than 30 (step S404; Yes), the control apparatus 1000 stores the main spindle speed D at 2000 rpm in the RAM 71 (step S406), and stores the stored main shaft. The spindle speed command by the speed D is output to the spindle motor 2a (step S407). As a result, the spindle speed decreases from one needle before the center presser foot 29 is driven.

If it is determined in step S401 that the data following one needle is not the center presser foot height data (step S401; No), the control device 1000 determines whether the next data is the center presser foot data (step S408). If it is determined that the next data is the center presser foot height data (step S408; Yes), the control apparatus 1000 ends the spindle speed variable processing (subroutine) and returns to the main routine.

On the other hand, when it is determined that the next data is not the center presser foot height data (step S408; No), the control apparatus 1000 determines whether or not the spindle speed D stored in the RAM 72 is 2500 rpm (step). S409).

If it is determined that the spindle speed D is 2500 rpm (step S409; Yes), the control apparatus 1000 ends the spindle speed variable processing (subroutine) and returns to the main routine.

On the other hand, when it is determined that the spindle speed D is not 2500 rpm (step S409; No), the control apparatus 1000 stores 2500 rpm as the spindle speed D in the RAM 72 (step S410). The main shaft speed speed command by the completed main shaft speed D is outputted to the main shaft motor 2a (step S407). Thereby, the main shaft speed which decelerated in order to drive the center presser foot 29 will return to 2500 rpm.

As described above, according to the sewing machine 100 according to the present embodiment, since the bottom dead center height of the center presser foot 29 can be adjusted by dividing the spindle speed into a plurality of needles, the spindle speed is increased. It is possible to adjust the bottom dead center height of the center presser foot 29 without changing. Thereby, a spindle speed does not become low and productivity and sewing stability can be improved.

In addition, in this embodiment, when the effect which shifts a spindle speed is input from the shift switching key 74n of the operation panel 74a, adjustment of the bottom dead center height of the center presser foot 29 is divided into several needle numbers. In the case where the effect of shifting of one spindle speed is input, it is determined that the adjustment of the bottom dead center height is performed by dividing into a plurality of needle numbers. That is, the operation panel 74a is the selection means according to the present invention. In this way, it is possible to input from the operation panel 74a whether or not the adjustment of the bottom dead center height is performed by dividing into a plurality of needle numbers. Therefore, it is determined whether the adjustment of the bottom dead center height is performed by dividing into a plurality of needle numbers. It can be switched easily. For example, when it is assumed that the center presser foot is caught at the end of the sewing object by dividing the bottom dead center height, the center presser foot 29 is inputted so as to adjust the bottom dead center height without dividing by the operation panel 74a in advance. It can prevent a jam with the sewing material. In addition, since whether or not the main shaft speed is shifted from the operation panel 74a is input, the input result can be stored in the EEPROM 72, or in the pattern data as data.

In addition, as in the present embodiment, a dedicated switch is provided without inputting whether or not the main shaft speed is shifted to the operation panel 74a so as to select whether to shift by ON / OFF of this switch. It may be.

In addition, the selection data may be stored in the pattern data.

In addition, in this embodiment, the case where the adjustment of the bottom dead center height of the center presser foot 29 is divided into two or more before the next one needle advances was demonstrated and demonstrated, for example, like 3 needles in total including 1 needle before and after. You may divide into adjustment of the bottom dead center height of the center presser foot 29 by averaging with more needle number.

In the present embodiment, the EEPROM 72 is described as an example of the storage means and the center presser foot height storage means. However, the present invention is not limited thereto, and other storage means (magnetic recording medium, optical recording) are not limited thereto. Medium, semiconductor memory, etc.) may be provided.

In addition, it may be a drive mechanism such as one-axis drive or circular arc drive, instead of the XY mechanism.

Moreover, of course, it can change suitably also about other specific detailed structure.

According to the invention of claim 1, since the bottom dead center height is adjusted by dividing the spindle speed into a plurality of needles constantly, the bottom dead center height of the center presser foot can be adjusted without changing the spindle speed. Thereby, a spindle speed does not become low and productivity and sewing stability can be improved.

According to the invention as set forth in claim 2, since it is possible to input whether or not the bottom dead center height is adjusted by dividing into a plurality of needles, the bottom dead center height is adjusted by dividing into a plurality of needles. Whether or not can be easily switched. For example, when it is assumed that the center presser foot is caught at the end of the sewing material by adjusting the bottom dead center height, if the input is made to adjust the bottom dead center height without dividing by the selection means in advance, the center presser foot and the sewing material are caught. Can be prevented.

Claims (2)

The center presser foot which presses the sewing object toward the needle board, when removing the sewing needle supported by the needle bar from the sewing material, By rotating around the axis, the sewing needle is moved up and down to move the needle bar up and down, and at the same time the main axis for moving the center presser foot up and down along the Shanghai East direction of the sewing needle, A spindle drive motor for driving the spindle; An adjustment shaft for adjusting the height from the needle plate when the center presser foot reaches the bottom dead center by rotating around the axis; A control shaft drive motor for driving the control shaft; A storage unit for storing the bottom dead center height of the central presser foot together with needle stitch data; A center presser foot device of a sewing machine having control means for controlling the spindle drive motor and the control shaft drive motor based on the bottom dead center height and the needle stitch data stored in the storage unit, The control means controls the spindle drive motor to make the spindle speed of the spindle constant while adjusting the bottom dead center height during sewing, and controls the drive of the adjustment shaft drive motor to be divided into a plurality of needle numbers. Center presser foot device of the sewing machine, characterized in that. The method of claim 1, Selection means for inputting to the control means whether or not the adjustment of the bottom dead center height is divided into a plurality of needle numbers is provided, And said control means controls said spindle drive motor and said adjustment shaft drive motor so that said bottom dead center height is adjusted based on an input result of said selection means.

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