KR101240387B1 - Device for detecting changes of fabric thickness of sewing machine - Google Patents

Abstract

The present invention aims to simplify the configuration.

Detecting the thickness change of the to-be-sealed object through the center presser foot 29 which presses a to-be-sealed object toward the needle board at the time of sewing, the center presser foot drive mechanism 1 which gives the center presser foot a reciprocating motion along the up-down direction, and a center presser foot. The center presser foot drive mechanism includes the evacuation member 11 which performs the retraction operation in place of the descending operation of the center presser foot when the center presser foot driving mechanism receives a load exceeding a predetermined amount when the center presser foot descends. The thickness change detecting means adopts a configuration for detecting a change in thickness of the object to be sealed from the evacuation operation of the evacuation member.

Description

Cloth thickness change detection device of sewing machine {DEVICE FOR DETECTING CHANGES OF FABRIC THICKNESS OF SEWING MACHINE}

BRIEF DESCRIPTION OF THE DRAWINGS The left side view which looked at the principal part of the sewing machine which is 1st Embodiment of this invention from the surface part side.

2 is an exploded perspective view of a partial configuration of the main part shown in FIG.

3 is an exploded perspective view of the remaining part of the main part shown in FIG.

4 is an operation explanatory view of the configuration of the periphery of the center presser foot lifting cam as seen from the center line direction.

Figure 5 is a view illustrating the operation of the main part of the sewing machine seen from the side of the side.

6 is a block diagram showing a control system of the sewing machine.

7 is a flowchart showing the first sewing process in the thickness acquisition mode during sewing.

Fig. 8 is a flowchart showing the sewing process after the second time in the thickness acquisition mode during sewing.

Fig. 9 is a flowchart showing a preliminary sewing process in a thickness acquisition mode at the time of unsewing.

The left side view which looked at the principal part of the sewing machine which is 2nd Embodiment of this invention from the surface part side.

Fig. 11 is a flowchart showing the first sewing processing in the thickness acquisition mode in sewing of the second embodiment.

Fig. 12 is a flowchart showing the sewing process after the second time in the thickness acquisition mode during sewing of the second embodiment.

Fig. 13 is a flowchart showing a preliminary sewing process in a thickness acquisition mode during unsewing of the second embodiment.

                Explanation of symbols on the main parts of the drawings

1: center presser foot device (center presser foot drive mechanism, height adjusting means)

11: second link (retraction member)

15: sewing machine frame

29: center presser foot

60,60A: Center presser foot sensor (thickness change detection means, contact switch)

61: first contact

62: second contact

63: member to be detected

64: comb number sensor

65: mounting force adjusting device

66: mounting solenoid

70: motion control means

81: sewing machine motor

100,100A: Sewing Machine

The present invention relates to a cloth thickness change detection device for a sewing machine having a central presser foot.

Conventionally, in sewing machines for which the fabric is sewn while conveying the fabric in the XY direction without using a feed tooth, such as an embroidery sewing machine, in order to prevent the fabric from rising and fluttering with the needle due to friction with the needle, A center presser foot is provided which presses down the periphery of the penetrating portion. Such a center presser foot is usually pressed down by the center presser foot when the needle is lifted from the cloth, and the center presser foot is raised with the needle after the needle has completely risen from the cloth.

Moreover, in the said conventional sewing machine, the thickness detection means for detecting the thickness change of the cloth on a needle plate was provided, and it detected at the time of sewing (for example, refer patent document 1).

[Patent Document 1] Japanese Patent Laid-Open No. H5 (1993) -300988 (Fig. 6)

However, the thickness detecting means in Patent Literature 1 has a configuration in which a contactor is brought into contact with the upper surface of the cloth held in a frame moving in the XY direction, and a sensor is used to detect the displacement of the contactor. There was a problem that occurred.

In addition, since the contact is brought into contact with the upper surface of the cloth moving in the XY direction, the thickness change is detected. There was a problem.

An object of the present invention is to simplify the configuration of the cloth thickness detection device and to improve the detection accuracy of the cloth thickness.

The invention according to claim 1 further includes a center presser foot for pressing the to-be-sealed object toward the needle plate during sewing, a center presser foot drive mechanism for providing a reciprocating motion in the vertical direction to the center presser foot, and a change in the thickness of the to-be-sealed object through the center presser foot. And a thickness change detection means for detecting, wherein the center presser foot drive mechanism includes a evacuation member that performs an escape operation in place of the descending operation of the center presser foot when the center presser foot receives a load exceeding a predetermined amount when the center presser foot is lowered. The detection means adopts a configuration for detecting a change in thickness of the to-be-sealed object from the evacuation operation of the evacuation member.

In addition, in thickness change detection means, "detecting a thickness change" includes the case where only the occurrence of a thickness change is detected, and also the case where the amount of change of thickness is detected.

In the above configuration, the center presser foot is normally moved up and down between the top dead center and the bottom dead center of a constant height by the center presser foot drive mechanism. And with the increase in the thickness of a to-be-sealed | blocked object, when a bottom dead center cannot be reached at the time of a descending of a center presser foot, a evacuation member moves by the reaction force which a center presser foot receives. Then, the thickness detecting means detects that a thickness change has occurred in the object to be sealed by the movement of the evacuation member.

In the above configuration, since the thickness change of the to-be-sealed object is detected through the center presser foot, an independent contactor is unnecessary, thereby reducing the number of parts.

In addition, it is not necessary to secure a space for contacting the contactant to the to-be-sealed object separately from the center presser foot, so that the device can be miniaturized and simplified.

Furthermore, since the thickness change of the to-be-sealed object is detected through the center presser foot, the detection is made to press the to-be-sealed object from above, so that the influence of sliding can be suppressed.

Invention of Claim 2 has the same structure as invention of Claim 1, and height change means which adjusts the bottom dead center height of the central presser foot in the shanghai-dong, and thickness change detection means are carried out the thickness change of the to-be-encapsulated object. When detecting, the configuration is provided with a presser foot height control means for controlling the height adjusting means to adjust the bottom dead center height of the center presser foot.

In the above configuration, the center presser foot normally moves up and down between the top dead center and the bottom dead center of a constant height by the center presser foot drive mechanism. And when the thickness change of the to-be-sealed | blocked object is detected by thickness change detection means, the bottom dead center height of the center presser foot by the center presser foot drive mechanism is adjusted.

The invention as set forth in claim 3 has the same configuration as the invention as set forth in claim 2, and includes moving means for positioning a sewing object and a sewing needle relative to an arbitrary position of a plane on a needle plate, and moving means. Sewing control means for controlling positioning according to sewing data indicating each position to be positioned for each needle movement number moving up and down of the sewing needle, and when the position is determined to each position by the sewing control means. By controlling to detect the thickness change of a to-be-sealed object, the structure provided with the change needle number detection control means which writes into the sewing data the frequency | count of needle movement which a thickness change generate | occur | produced is employ | adopted.

In the above configuration, the moving means is controlled to relatively position the sewing needle and the sewing object for each needle movement number in accordance with the sewing data. When a change in the thickness of the sewing object is detected at a position corresponding to the positioned sewing needle, all the number of needle movements in which the change has occurred is written in the sewing data. As a result, at the next sewing, it is possible to recognize in advance whether a change in thickness will occur in the sewing object at what needle movement number, so that various control according to the change in thickness can be performed.

The invention described in claim 4 has the same configuration as the invention described in claim 3, and the change needle number detection control means writes in the sewing data the number of needle movements in which the thickness change occurs when sewing is performed by the sewing control means. A configuration for performing the processing is adopted.

That is, at least one sewing is made by sewing data of a step in which the number of needle movements in which the thickness change occurs is not written. Accordingly, sewing data in which the number of needle movements in which the thickness change occurs is written is obtained, and thereafter. The sewing is made based on the sewing data in which the number of needle movements at which the thickness change occurs is written.

The invention described in claim 5 has the same configuration as the invention described in claim 4, and the change needle number detection control means includes the number of needle movements in which the thickness change occurs when preliminary sewing is performed by the sewing control means. Adopt a configuration for performing the process of writing in the.

The above-mentioned "preliminary sewing" is a work to drive the shanghai drive source and the moving means of the sewing needle in the state that the sewing object is set on the moving means, but the sewing thread is not sewn on the sewing needle or the sewing needle itself is not attached to the needle bar. I shall say. In this case, actual sewing is not performed.

That is, preliminary sewing is performed based on the sewing data of the stage in which the needle movement frequency at which the thickness change occurs is not written, and accordingly, sewing data in which the needle movement frequency at which the thickness change occurs is written is obtained, and actual sewing is performed. In the sewing, sewing is performed based on the sewing data in which the number of needle movements in which the thickness change occurs is written.

The invention according to claim 6 has the same configuration as the invention according to claim 5, and after the processing for writing the number of needle movements in which the thickness change has occurred, the moving means and the height adjusting means perform the checking operation in accordance with the sewing data. A configuration including a confirmation operation control means for performing is adopted.

In the above configuration, at the time of the preliminary sewing operation, the number of needle movements in which the cloth thickness change occurs is added to the sewing data to perform preliminary sewing again. As a result, the appropriateness can be judged with respect to the height of the bottom dead center of the central presser foot and the relative height between the sewing material.

The invention as set forth in claim 7 has the same configuration as the invention as set forth in any one of claims 1 to 6, and a mounting force adjusting device for imparting resistance to the unwinding of the sewing thread supplied to the sewing needle, and detecting a thickness change. When detecting the thickness change of the to-be-sealed object by a means, the structure provided with mounting force control means which controls to change the resistive force which a mounting force adjustment apparatus gives is employ | adopted.

In the above configuration, when the thickness change of the to-be-sealed object is detected by the thickness change detecting means, the mounting force by the mounting force adjusting device is adjusted.

(Embodiment 1)

(Overall Configuration of Embodiments)

Figure 1 is a left side view of the main part of the sewing machine 100 of the present embodiment from the side of the face, Figure 2 is an exploded perspective view of a part of the configuration of the main part shown in Figure 1, Figure 3 is a part of the remaining part of the main part shown in Figure 1 An exploded perspective view of the configuration.

The sewing machine 100 maintains a fabric which is a sewing material on the upper surface of the needle plate, a shanghai-dong mechanism that is not shown to move the sewing needle up and down, a drum mechanism that entangles the lower thread to the sewing thread inserted into the sewing needle under the needle plate, and a sewing material on the upper surface of the needle plate. At the same time, the cloth holding mechanism serves as a moving means for moving the cloth along the XY axis direction perpendicular to the needle plate upper surface and determining its position, and the center presser foot 29 reciprocates up and down during sewing to move the sewing object toward the needle plate. Provides resistance to the pressing center presser foot device 1, the center presser foot sensor 60 as a thickness change detection means for detecting the thickness change of the cloth through the center presser foot 29, and the sewing thread supplied to the sewing needle. A mounting force adjusting device 65 and an operation control means 70 for performing operation control of each of the above components.

On the other hand, the above-described Shanghai copper mechanism, drum mechanism, cloth holding mechanism, the mounting force adjusting device 65 is a well-known configuration, so detailed description thereof will be omitted.

(Center presser foot device)

The center presser foot device 1 adjusts the center presser foot 29 and the center presser foot drive mechanism for imparting a shanghai drive force to the center presser foot 29, and the bottom dead center height position of the center presser foot in the shanghai east direction. It is provided with a height adjusting means.

Hereinafter, the center presser foot device 1 will be described in detail.

1 to 3, the center presser foot device 1 is driven by a sewing machine motor 81 from an upper shaft 2 for driving a needle bar (not shown) provided with a sewing needle at its tip in the vertical direction. Up and down reciprocating force of the center presser foot 29 is obtained. That is, the eccentric cam 3 is fixed to the upper shaft 2, and the connection 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.

At the other end of the swing shaft 6, the base end of the center presser foot adjustment arm 7 for adjusting the amount of movement in the vertical direction D1 of the center presser foot 29 is fixed. The center presser foot adjustment arm 7 oscillates about the swing shaft 6, and the center presser foot adjustment arm 7 is formed with a groove cam 7a along its swing radius direction. 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 formed by the adjusting nut 9 and the stepped screw 10. The rotation is fixed freely. The fixed position is formed between a position intersecting the axis line of the swing shaft 6 and a predetermined position range of one end side of the center presser foot adjustment arm 7 at the intersection position, and the adjustment can be made as desired within this range. have.

The other end of the first link 8 is connected so that rotation is free by the stepped screw 12 in the longitudinal middle portion of the second link 11. In addition, the groove cam 7a to which the adjustment nut 9 engages is centered on the axial center of the stepped screw 12 when the center presser foot 29 (described later) is at the bottom dead center of the up and down reciprocating motion. Be part of an arc. Positioning links 13 are arranged on the rear side of the second link 11, and end portions of the second links 11 are connected to each other so as to be rotatable by a stepped screw 18. As shown in FIG.

The positioning link 13 is attached to the sewing machine frame 15 as the sewing machine housing freely by a stepped screw 14 near its central portion in the longitudinal direction, and the stepped screw 14 is positioned at the center presser foot. This coincides with the position of the stepped screw 12 when (29) is at the bottom dead center.

A spring hanger 13a is attached to the other end of the positioning link 13, and a spring hanger 15a is also fixed to the sewing machine frame 15, and a coil spring 16 hangs between these spring hangers. The other end of the positioning link 13 to which the hook 13a is attached is pressed down to pull down. That is, the coil spring 16 moves the connection part M1 downward when the connection part M1 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 for pressurizing. A stopper 17 is connected to the other end of the positioning link 13, and is connected to one end of the second link 11 and the other end of the positioning link 13 with one end screw 18. have. In addition, the stopper 17 is attached to the sewing machine frame 15 together with the positioning link 13 by a stepped screw 14 so as to be free to rotate. The restricting member 19 is provided above the one end 17a of the stopper 17 so as to restrict rotation of the stopper 17 upward. In addition, the restricting member 19 may be substituted as part of the sewing machine frame 15.

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. The center presser foot holder 27 is fixed to the link relay plate 25, and the 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. A coil spring 30 is installed at the upper end of the center presser foot stand 28, and the coil spring 30 is held on the sewing machine frame 15 by a bolt 31 and a nut 32 so that the center presser foot holder ( Press 27) downward.

As described above, the above-described center presser foot drive mechanism is constituted from the eccentric cam 3 to the nut 32 and converts the rotational driving force of the upper shaft 2 into the reciprocating driving force in the vertical direction and transmits it to the central presser foot 29. To do.

Moreover, the stepped screw 23 connects the square piece 33, the third link 20, and the fourth link 22. That is, the guide member 34 is disposed on the front side of the fourth link 22, and the square piece 33 is installed to enter the long hole 34a formed along the vertical direction with respect to the guide member 34. The third link 20, the fourth link 22, and the square piece 33 are connected with one end screw 23.

The square piece 33 slides along the longitudinal direction of the long hole 34a and serves as a guide for moving the connection portion between the third link 20 and the fourth link 22 along the long hole 34a. do.

The guide member 34 is a substantially triangular plate material, and the upper end portion 34t is attached to the sewing machine frame 15 freely by the 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 square piece 33 in a range in which the square piece 33 can slide, and the square piece 33 is accommodated in 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.

Further, 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 at the guide member 34. The 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. One end of the variable shaft 39 is connected to the eccentric cam 38 so as to pass through its center line. The other end of the movable link 36 is connected to the eccentric position of the eccentric cam 38.

Moreover, the stepping motor 42 as a drive means is connected to the other end of the variable shaft 39 via the bearing 40 and the bevel gear 41. That is, the driving of the stepping motor 42 is transmitted in the order of the variable shaft 39, the eccentric cam 38, and the moving link 36 so that the moving link 36 moves the guide member 34.

The bevel gear 43 is meshed with the bevel gear 41 so that the drive of the stepping motor 42 can be output in the direction D5 orthogonal to the axial direction of the variable 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.

4 is an operation explanatory view of the configuration of the periphery of the central presser foot lifting cam 45 viewed from the center line direction. As shown in FIG. 4, the center presser foot lifting cam 45 is formed in the shape of an arc having the same distance from the center of rotation to the outer peripheral surface in the range of 0 to 180 degrees with respect to its support axis (hereinafter, Holding portion 45a), in the range of 180 to 360 degrees, the distance from the rotation center to the outer circumferential surface gradually changes greatly from the rotation center to the outer circumferential surface in the holding portion 45a toward the clockwise direction (hereinafter, Change portion 45b).

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. 4), but the center presser foot lifting cam 45 The center presser foot raising member 46 is raised when the changing portion 45b is in contact with the roller 47.

The center presser foot raising member 46 is attached to the sewing machine frame 15 freely by the pin 48 at its intermediate portion. 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. As the other end of the center presser foot raising member 46 rises, the center presser foot holder 27 may be raised to raise the center presser foot 29 to the retracted height position P5 (see FIG. 7). In addition, the sewing machine frame 15 is provided with a spring hook 49 so as to be located above the center presser foot lift member 46, and one end of the coil spring 50 is caught by 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.

As described above, the above-described height adjusting means is constituted from the square piece 33 to the coil spring 50. That is, the bottom dead center position of the center presser foot 29, which moves up and down by the stepping motor 42, can be moved and adjusted to an arbitrary height, and the rest of the accompaniment is driven. It is possible to switch the center presser foot 29 to the use position at the time of sewing and the retracted position at the time of non-sewing.

In more detail, when the stepping motor 42 drives in the angular range of the circumference in which the holding part 45a of the center presser foot lifting cam 45 contacts the roller 47, the tip of the variable shaft 39 is driven. An eccentric cam 38 installed on the rocking guide member 34 through the moving link (36). As a result, the square pieces 33 move in the left and right directions in FIG. 1, and further, the third link 20 and the fourth link 22 are changed from the parallel side by side to the curved state at the connection portion of each other. Then, the length L of the connection length L between the third link 20 and the fourth link 22 is changed according to the amount of bending, and as a result, the bottom dead center height of the center of the presser foot 29 is changed and adjusted.

In addition, the center presser foot raising member 46 does not oscillate within the angular range of the semicircle in which the holding part 45a of the center presser foot lifting cam 45 comes into contact with the roller 47.

On the other hand, when the stepping motor 42 drives in the angular range of the remaining half circumference in which the change portion 45b of the center presser foot lifting cam 45 contacts the roller 47, the roller 47 is gradually pushed downward. The lower end portion of the center presser foot raising member 46 moves the center presser foot 29 upward through the center presser foot holder 27 and the center presser foot stand 28. Therefore, the center presser foot 29 can be raised from the use position to the retracted position. In addition, when returning the center presser foot 29 from a retracted position to a use position, the stepping motor 42 until the roller 47 moves from the change part 45b of the center presser foot lifting cam 45 to the holding part 45a. ). As a result, the use position of the center presser foot 29 and the retraction position are made.

(Tension control device)

The thread tension adjusting device 65 is closed by a thread tension solenoid 66 that generates a thrust according to the amount of electric current being energized, and a thread tension solenoid 66, and a gap between the thread tension solenoid 66 and the upper thread is fitted to tension the thread. It is provided with a pair of mounting force adjustment disk to give.

The mounting force solenoid 66 is connected to the operation control means 70 through the driving circuit 66a, and the driving circuit 66a is mounted on the mounting force solenoid at a current value corresponding to the control signal output by the operation control means 70. By energizing 66, an arbitrary thrust can be output to impart an arbitrary tension to the upper thread.

(Center presser foot sensor)

In the second link 11 of the center presser foot device 1 described above, an elastic force is applied upward by the coil spring 16 to the left end of FIG. 1, and the right end is The upper and lower movement force is transmitted to the center presser foot 29 through the third link 20, and the intermediate portion is provided with the upper and lower movement force by the first link 8. In addition, since the restricting member 19 abuts against the upper end of the left end of the second link member 11 and restricts upward movement, the elastic force of the coil spring 16 at the time of sewing causes the second link member to restrain. As long as the left end of (11) is held at a constant position in contact with the restricting member 19, the second link 11 only swings around the stepped screw 18 of the left end.

However, when the bottom end of the second link 11 cannot reach the bottom dead center predetermined due to the thickness of the cloth, for example, because the thickness of the cloth becomes thicker than usual, the right end The left end is moved downward by starting the swing around the part. That is, when the second link 11 receives a load exceeding a predetermined amount when the center presser foot 29 descends, the evacuation member performs the escape operation (falling movement of the left end) instead of the descending operation of the center presser foot 29. Function as.

The central presser foot sensor 60 is comprised on the assumption of the above-mentioned structure. That is, the center presser foot sensor 60 has a cut-out shape in which the first contact 61 formed at the left end of the second link 11 and the first contact 62 come into contact with the first contact 62 with a slightly elastic pressing force from above. 2nd contact 62 is provided and the contact type switch is comprised by these.

The first contact 61 is grounded through a member such as the second link 11. The second contact 62 can be energized from the energization circuit 60a. When the first contact 61 and the second contact 62 are in contact with each other, current flows and the current is disconnected when the second contact 62 is in contact.

The second contact 62 is disposed so as to contact with the first contact 61 in a state where the left end of the second link 11 abuts against the restricting member 19 with a slightly elastic pressing force from above. When the thickness of the cloth becomes thicker than usual and the left end of the second link 11 moves downward by a predetermined distance as shown in FIG. 5, the second contact 62 is separated from the first contact 61.

Then, the power supply circuit 60a is connected to the operation control means 80, and the operation control means 80 detects whether an increase in cloth thickness has occurred depending on whether the power supply circuit 60a is energized or non-energized. It is supposed to be.

In addition, the center presser foot sensor 60 uses two contacts 61 and 62. If the contact and separation state between the two points where the contacts 61 and 62 are formed can be detected, for example, an optical sensor, Any detection means, such as proximity sensors, slit panels or contact switches, may be used.

(Control system of sewing machine)

The operation control means 70 will be described with reference to FIG. 6 is a block diagram showing a control system of the sewing machine 10. First, the configuration around the operation control means 70 will be described.

The operation panel 75 shown in FIG. 6 is an input / output device having display means for displaying a predetermined image and a touch panel provided on the display screen. On the display screen, various sewing information or various setting buttons output from the operation control means 70 are displayed, and the touch panel detects an input operation for various display switches, and coordinate information of the input instruction position according to the touch operation. Is output to the operation control means (70). The operation control means 70 stores the individual data at each predetermined position of the display area corresponding to the image data being outputted, and when the position coordinates of the respective positions coincide with the position of the input instruction position, It can be read to recognize that the data has been selected.

The sewing machine starting pedal 76 shown in FIG. 6 is ON-OFF input means for instructing and inputting the starting of the sewing machine motor 81 according to the stepping operation. By the input circuit 76a provided in the sewing machine starting pedal 76, a signal corresponding to the operation of the sewing machine starting pedal 76 is input to the operation control means 70.

In addition, the above-described center presser foot sensor 60 outputs a detection signal to the operation control means 70 through the power supply circuit 60a.

The cloth holding mechanism described above uses the X-axis motor 82 and the Y-axis motor 83, which are stepping motors, which move the cloth in the X-axis direction and the Y-axis direction orthogonal to each other along the plane on the needle plate.

Each motor 82, 83 is provided with drive circuits 82a and 83a, and the drive control is performed by the rotation angle according to the control signal of the operation control means 70, respectively.

In addition, the sewing machine motor 81 is a servo motor, and the drive control is performed by the drive circuit 81a by the amount of rotation corresponding to the control signal of the operation control means 70. In addition, since the amount of rotation can be controlled by the angle unit, the operation control means 70 can recognize the current rotation angle position of the sewing machine motor (81).

In addition, the stepping motor 42 of the central presser foot device 1 is connected to the operation control means 70 through the drive circuit 42a, and the stepping motor 42 is controlled by the amount of rotation corresponding to the control signal of the operation control means 70. Drive control is made.

Further, as described above, the mounting force solenoid 66 of the mounting force adjusting device 65 is connected to the operation control means 70 through the driving circuit 66a, and in accordance with the control signal from the operation control means 70. The mounting force is controlled.

The operation control means 70 is a ROM 72 in which various functions, operations and control data for executing the operation of the sewing machine 100 described later are written, and the control data of each part is centrally controlled according to the control program. MPU 71, which is a microcomputer to generate and display on the display unit of the operation panel 75, a RAM 73 for storing processing data of the MPU 71 and various data relating to sewing processing in the work area, and the RAM. An EEPROM 74 is provided which stores and maintains the processing data stored in 73 or stores sewing data for executing a predetermined sewing.

The RAM 73 is provided with various work memories, counters, and the like, and is also used as a work area during a sewing operation.

In the EEPROM 74, sewing data in which various parameters for performing sewing are set as described above is stored.

That is, in the sewing data, the driving amount of the X-axis and Y-axis motors 82 and 83 for determining the position of the cloth with respect to the sewing needle for each needle movement count (the number of shank movements of the needle) from the start of sewing, The tension data of the mounting tension solenoid 66 at the time of normal sewing is set.

By executing a predetermined processing program, the CPU 71 drives the X-axis and Y-axis motors 82 and 83 according to the sewing data in advance for each needle drop, based on the sewing data at the time of sewing, so that each needle drop is set. Control to be done in the set position in order. As a result, the CPU 71 executes control as sewing control means.

Further, the CPU 71 detects the thickness change of the cloth by the central presser foot sensor 60 during sewing by selecting the mode from the operation panel 75 according to a predetermined processing program, and the number of needle movements in the sewing data. In the sewing data, the thickness acquisition mode is used to fill in the sewing data, and the thickness change of the cloth is detected by the central presser foot sensor 60 during sewing, and the thickness change occurs at any number of needle movements in the sewing data. A process of selectively executing the thickness acquisition mode at the time of non-sewing in which the sewing data is written in the sewing data is performed.

When selecting and setting the thickness acquisition mode at the time of sewing, the CPU 71 according to the sewing data in the EEPROM 74 by a predetermined processing program, with respect to the shank copper mechanism, the drum mechanism, and the cloth holding mechanism for each position of the needle. The motion control for dropping the needle is executed, and the change in cloth thickness is detected by the central presser foot sensor 60 for each movement of the needle. In other words, the CPU 71 sequentially counts the number of needle movements from the encoder of the sewing machine motor 81, and detects a state in which each of the contacts 61 and 62 of the central presser foot sensor 60 is disconnected (occurrence of increase in cloth thickness). The first number of needle movement detection control means for temporarily storing the number of needle movements at that time in the RAM 73, and writing the number of needle movements in which the increase in cloth thickness has occurred in the sewing data as sewing thickness data at the end of sewing. Processing as.

On the other hand, the thickness acquisition mode at the time of sewing is performed by setting the cloth to the cloth holding mechanism without setting the sewing needle or sewing thread in advance.

When selecting and setting the thickness acquisition mode at the time of the non-sewing, the CPU 71 moves the fabric to each position at each needle movement number with respect to the cloth holding mechanism according to the sewing data in the EEPROM 74 by a predetermined processing program. At the same time, the central presser foot sensor 60 detects the change in the cloth thickness at each needle movement number. In other words, the CPU 71 sequentially counts the number of needle movements from the encoder of the sewing machine motor 81, and detects a state in which each of the contacts 61 and 62 of the central presser foot sensor 60 is disconnected (occurrence of increase in cloth thickness). The second change needle number detection control means for temporarily storing the number of needle movements at that time in the RAM 73, and writing the number of needle movements in which the increase of the cloth thickness occurred at the end of sewing to the sewing data as the cloth thickness data. Processing as.

In addition, after the cloth thickness data is written into the sewing data in the above-described non-sewn thickness acquisition mode, the CPU 71 performs a predetermined processing program on the cloth holding mechanism according to the new sewing data in the EEPROM 74. An operation control is performed to move the fabric to each position for each needle movement, and the stepping motor 42 of the central presser foot device 1 is adjusted for each needle movement number of times the thickness change is detected based on the cloth thickness data. In addition, processing as confirmation operation control means for accepting the change of the adjustment height by the operation panel 75 is performed.

In any of the modes, the CPU 71 assumes an increase in cloth thickness when disconnection of each of the contacts 61 and 62 is detected by the center presser foot sensor 60 according to a predetermined processing program. Operation control as a presser foot height control means for raising the central presser foot 29 by a predetermined amount with respect to the stepping motor 42 of the presser foot device 1 is performed. Incidentally, the lift amount of the central presser foot 29, that is, the drive amount of the stepping motor 42 may be set in the ROM 72 as initial data or may be set in the EEPROM 74 together with the sewing data. .

In sewing, when the CPU 71 detects the disconnection of each of the contacts 61 and 62 by the center presser foot sensor 60 according to a predetermined processing program, it is assumed that an increase in the thickness of the cloth occurs and the mounting force is adjusted. Operation control as mounting force control means for changing the mounting force to the mounting force solenoid 66 of the apparatus 65 is executed. Regarding the value of the mounting force, it is preferable to set the amount of energization of the solenoid 66 in the ROM 72 or the EEPROM 74 in advance so as to increase the tension as the cloth thickness increases, for example. .

(Operation of the sewing machine)

The sewing operation of the sewing machine 100 based on the control of the operation control means 70 will be described according to the flowcharts shown in Figs.

Fig. 7 is a flowchart showing the processing of the operation control means 70 during the first sewing execution in the selection setting of the thickness acquisition mode during sewing described above.

First, when sewing is started by the drive of the sewing machine motor 81 (step S1), the CPU 71, the center presser foot sensor 60 in the off state (the first contact 61 and the second contact 62 is separated) State) (step S2).

As a result, when it is detected that the power supply circuit 60a shows an on state (a state in which the first contact 61 and the second contact 62 are in contact) (step S2: NO), the sewing machine motor 81 With reference to the needle counter which counts the needle movement number by the encoder, it is determined whether the final needle movement number for executing a series of sewing set in the sewing data has been reached (step S3).

When the final needle movement number is reached (step S3: YES), the needle movement number which raises the center presser foot 29 or the needle movement number which has been returned to its original height is already stored in steps S4 and S8 described later. If there is, the process of writing the number of needle movements, the amount of rise at that time, and the number of needle movements that continued the rise in the sewing data is executed (step S13), and sewing is finished.

If the final needle movement number has not been reached (step S3: NO), the processing returns to step S2.

Further, in the process of step S2, if the off state of the central presser foot sensor 60 is detected (step S2: YES), it indicates that the thickness of the cloth has increased, so that the CPU 71 refers to the needle count counter at that time. The current number of needle movements is temporarily stored in the RAM 73 (step S4).

Then, the CPU 71 executes energization control of the mounting force solenoid 66 so as to become a mounting force preset for sewing thick fabric (step S5).

Further, the CPU 71 executes drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by a predetermined height (step S6).

Then, the CPU 71 again detects whether the central presser foot sensor 60 is in the off state (step S7). That is, it is determined whether the bottom dead center is pulled up to a sufficient height with respect to the cloth whose thickness is increased by the rising control with respect to the bottom dead center of the center presser foot 29 of step S6. As a result, when the center presser foot sensor 60 is still in the off state (step S7: YES), it means a state in which the lower dead center of the center presser foot 29 has an insufficient amount of pulling, so that the processes of steps S4 to S6 are executed again.

In addition, when the center presser foot sensor 60 is in the on state (step S7: NO), it means that the bottom dead center of the center presser foot 29 is sufficiently increased, so that the needle returns to the original cloth thickness from the increase in the cloth thickness. As the number of movements, the current number of needle movements at that time is temporarily stored in the RAM 73.

The process proceeds to step S8 and sewing is continued in the state where the bottom dead center of the center presser foot 29 is raised by the predetermined number of needle movements (step S8).

In the process of step S8, when the set number of times is not reached (step S8: NO), only the process of step S8 is repeated. When the needle movement count is reached, sewing is terminated, and when the needle movement count is not reached, the process returns to step S8.

Subsequently, when sewing is performed while the bottom dead center of the center presser foot 29 is raised by the set number of needle movements (step S8: YES), the CPU 71 steps the bottom dead center of the center presser foot 29 to its original height. The drive control of the motor 42 is executed (step S9), and the energization control of the mounting force solenoid 66 is performed so as to become the original mounting force set in the sewing data (step S10).

Then, the CPU 71 detects whether the center presser foot sensor 60 is in the off state (step S11), and if the off state of the center presser foot sensor 60 is detected (step S11: YES), the thick portion of the cloth still continues. This means that the process from step S4 is executed again.

In addition, if the on state of the central presser foot sensor 60 is detected (step S11: NO), it means that a thick part of the cloth has passed, so that the final needle for executing a series of sewing set in the sewing data with reference to the needle count counter. It is determined whether or not the number of workouts has been reached (step S12). If the final needle movement number is reached (step S12: YES), the needle movement number which raised the central presser foot 29 memorized in steps S4 and S8, or the needle movement number returned to its original height, and then The process of writing the amount of rise and the number of needle movements that continued the rise in the sewing data is executed (step S13), and sewing is finished.

When the final needle movement number has not been reached (step S12: NO), the processing returns to step S2 to continue sewing.

8 is a flowchart showing the processing of the operation control means 70 at the time of sewing execution after the second time in the selection setting of the thickness acquisition mode at sewing.

First, when sewing is started in accordance with the drive of the sewing machine motor 81 (step S14), the cloth thickness data in the sewing data is indicated by referring to the needle counter that counts the number of needle movements by the encoder of the sewing machine motor 81. It is determined whether the increase in the thickness of the cloth is the number of needle movements generated or the number of needle movements returned from the increase in the original thickness of the cloth (step S15).

If the number of needle movements is not reached, sewing is continued according to the sewing data (step S15: NO), and if it is any one needle movement number (step S15: YES), the process proceeds to step S16.

In step S16, it is determined whether the number of needle movements in which the increase in cloth thickness has occurred or the number of needle movements returned to the original cloth thickness is determined, and in the case of the number of needle movements in which the increase in cloth thickness occurs (step S16: YES), The CPU 71 executes the drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by a predetermined height (step S17), and the mounting force solenoid so as to be the mounting force set for sewing thick fabric. The energization control of step 66 is executed (step S18). Then, the process proceeds to step S20.

In addition, in the case of the number of needle movements returned from the increase in the thickness of the cloth to the original thickness of the cloth (step S16: NO), the CPU 71 steps the bottom dead center of the center presser foot 29 to return to the original height at the rising position. The drive control of the motor 42 is executed, and the mounting force is returned to the normal value (step S19), and the process proceeds to step S20.

Then, in step S20, the CPU 71 refers to the needle counter and determines whether the final needle movement number for executing a series of sewing set in the sewing data has been reached, and as a result, when the final needle movement number has been reached. (Step S20: YES) When sewing is complete | finished (step S20: NO), it returns to the process of step S15 and continues sewing.

Fig. 9 is a flowchart showing the processing of the operation control means 70 at the time of selecting and setting the non-sewing thickness acquisition mode described above in which the fabric is set and the respective parts are operated but actual sewing is not performed.

First, the drive of the sewing machine motor 81 is started, and the CPU 71 detects whether the center presser foot sensor 60 is in an off state (step S31).

As a result, when it is detected that the power supply circuit 60a is in the on state (step S31: NO), it is determined whether the final needle movement number set in the sewing data has been reached by referring to the needle count counter (step S32). . When the final needle movement number is reached (step S32: YES), the sewing machine motor 81 is stopped and the process proceeds to step S37.

When the needle counter does not reach the final needle movement count (step S32: NO), the processing returns to step S31.

Further, in the process of step S31, if the off state of the center presser foot sensor 60 is detected (step S31: YES), it indicates that the thickness of the cloth has increased, so that the CPU 71 refers to the needle count counter at that time. The current number of needle movements is temporarily stored in the RAM 73 (step S34).

Then, the CPU 71 refers to the needle counter to determine whether the final needle movement number for executing a series of sewing set in the sewing data has been reached (step S35). When the final needle movement frequency has not been reached (step S35: NO), the processing returns to step S31.

In addition, when the final number of needle movements is reached (step S35: YES), the sewing machine motor 81 is stopped (step S36), and the number of needle movements stored in the RAM 73 in step S34 is increased by the thickness of the cloth. The process of writing the sewing thickness in the EEPROM 74 as cloth thickness data indicating the number of needle movements to be generated is executed (step S37).

Since the cloth thickness data written in the sewing data by the processing up to step S37 only indicates the number of needle movements in which the increase in cloth thickness occurs, in step S38, in each needle movement number in which the increase in cloth thickness occurs, A support input is made as to whether or not to confirm the operation to set how much the bottom dead center of the center presser foot 29 should be raised.

That is, if an instruction to end without performing the checking operation is input from the operation panel 75, the process ends (step S38: NO).

When an instruction to perform a confirming operation is input from the operation panel 75 (step S38: YES), the sewing machine motor 81 starts restarting (step S39). As a result, the cloth holding mechanism and the center presser foot device 1 are also controlled in operation according to the sewing data.

Further, the CPU 71 refers to the needle counter, and determines whether or not the number of needle movements in which the increase in the cloth thickness stored in step S34 occurs is generated (step S40).

When the number of needle movements in which the increase in the thickness of the cloth is not generated occurs, the cloth holding mechanism and the center presser foot device 1 continue to operate according to the sewing data (step S40: NO), and the needle in which the increase in the thickness of the cloth occurs. At the number of movements (step S40: YES), the CPU 71 executes drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by a predetermined height (step S41), and the sewing machine motor 81 ), The driving of the cloth holding mechanism and the center presser foot device 1 is stopped (step S42).

In addition, a command input of a numerical input or no change of a correction value of the central presser foot 29 ascending amount based on the result of visually confirming the relative positional relationship between the center presser foot 29 and the cloth stopped at the bottom dead center position is performed. 75, the rising amount of the central presser foot 29 in which the input correction value is reflected is written into the sewing data as cloth thickness data at the number of needle movements (step S43).

Then, the CPU 71 refers to the needle counter and determines whether the final needle movement number for executing a series of sewing set in the sewing data has been reached (step S44), and when the final needle movement number has not been reached ( Step S44: NO), the sewing machine motor 81, the cloth holding mechanism, and the center presser foot device 1 are restarted from the next needle movement number and return to the processing of step S40.

If the final number of needle movements has been reached, the process proceeds to step S45 (step S44: YES), and the CPU 71 executes a process of writing the correction ascending amount set in step S43 into the sewing data in the EEPROM 74 and executing a series of steps. Processing is terminated.

In addition, sewing is performed on the sewing data updated in the non-sewing thickness acquisition mode shown in FIG. 9 based on the flowchart of FIG. 8 described above.

(Effect of Embodiment)

In the sewing machine 100, since the thickness change of the cloth is detected through the center presser foot 29, it is not necessary to install an independent member for thickness detection, thereby reducing the number of parts and at the same time reducing the number of members. The space can be reduced, and the productivity of the entire apparatus can be improved due to the miniaturization and simplicity of the apparatus.

In addition, when the thickness change is detected by the center presser foot sensor 60, since the operation control means 70 adjusts the bottom dead center height of the center presser foot 29, the cloth is protected and the center presser foot 29 Pressing the cloth at the time of lowering of the can be suppressed, and the thickness change of the to-be-processed object can be detected with favorable precision in the state which suppressed the influence of the center presser foot 29. FIG.

In addition, in the thickness acquisition mode at sewing or the thickness acquisition mode at non-sewing, the operation control means 70 writes data of the number of needle movements in which the thickness change of the cloth has occurred in the sewing data. It is possible to recognize in advance whether a change in thickness occurs in the sewing object at any needle movement number, and adjusts the mounting force of the mounting force adjusting device 65 or the bottom dead center height of the central presser foot device 1 according to the thickness change. Since control can be performed, the quality of sewing can be improved.

In particular, in the thickness acquisition mode at the time of sewing, cloth thickness data is added to the sewing data together with the actual sewing operation, thereby improving work efficiency.

On the other hand, in the non-sewing thickness acquisition mode, since the cloth thickness data is added to the sewing data before the actual sewing operation, the actual sewing operation can be performed in a state of knowing the thickness change of the object to be sewn, and sewing on all the cloths. The quality can be improved.

Furthermore, in the non-sewing thickness acquisition mode, after the cloth thickness data is added to the sewing data, the opportunity to reliably correct the bottom dead center height of the center presser foot can be obtained. Therefore, more accurate sewing is made during sewing. It will be possible to further improve.

(Embodiment 2)

(Summary of Embodiment)

The sewing machine 100A of 2nd Embodiment is demonstrated based on FIGS. 10-13.

As shown in FIG. 10, the sewing machine 100A is newly provided with a central presser foot sensor 60A capable of detecting the amount of change in movement of the end portion at the first contact 61 of the second link 11. It differs from the sewing machine 100 in that it performs an operation control considering the thickness change amount by obtaining the thickness change amount when a change in cloth thickness occurs.

Since only the center presser foot sensor 60A is different from the sewing machine 100 for the configuration other than the processing contents of the operation control, the same reference numerals are used for the same configuration as the sewing machine 100 with respect to the sewing machine 100A, and only for different points. Explain.

The center presser foot sensor 60A has a first and second contact points 61 and 62 for detecting the occurrence of a change in the thickness of the cloth, and an amount of movement of the ends of the first contact 61 side of the second link 11. And a comb-shaped to-be-detected member 63 for detecting the number of teeth, and an optical comb-toothed number sensor 64 to detect the number of comb teeth of the to-be-detected member 63.

The detected member 63 is fixed to the end of the first contact 61 side of the second link 11 so that the comb teeth arranged at equal intervals are arranged along the vertical direction.

The comb teeth sensor 64 has a light source disposed behind the comb teeth of the to-be-detected member 63 and emits light, and a light receiving element for detecting the brightness of the light of the light source blocked by the comb teeth. Therefore, the amount of movement up and down can be detected from the number of times the light received is flickering.

On the other hand, the detection signal of the comb teeth sensor 64 is output to the operation control means 70.

In addition, although the comb-tooth number sensor 64 was made optical, as long as the moving amount of the edge part of the 1st contact 61 side of the 2nd link 11 is calculated | required, you may use a detection element or a sensor of any system.

The sewing machine 100A differs from the sewing machine 100 in that the comb teeth sensor 64 is newly connected to the operation control means 70 and the detection signal is output to the control system.

In the case where the CPU 71 executes a process as the first or second change needle number detection control means performed based on a predetermined processing program, each part of the sewing machine is driven in accordance with the sewing data, When the thickness change occurs, the thickness change amount is detected and the detection cloth thickness is written in the sewing data in relation to the number of needle movements at that time.

In addition, when the CPU 71 executes the process as the presser foot height control means based on the predetermined processing program, the disconnection of the respective contacts 61 and 62 is detected by the central presser foot sensor 60 and comb teeth. When the cloth thickness is detected by the water sensor 64, the operation of raising the center presser foot 29 by the amount corresponding to the detection cloth thickness is performed on the stepping motor 42 of the center presser foot device 1. Different from 100).

Based on this point, the following describes each operation based on the operation control means 70 of the sewing machine 100A.

(Operation of the sewing machine)

Each of the following processes is performed by the CPU 71 of the operation control means 70 in accordance with a control program for executing each process.

Fig. 11 is a flowchart showing the processing of the operation control means 70 during the first sewing execution in selecting and setting the thickness acquisition mode at sewing.

First, when sewing is started in accordance with the drive of the sewing machine motor 81 (step S51), the CPU 71 detects the shank movement of the member 63 to be detected by the comb teeth sensor 64 of the central presser foot sensor 60A. It is determined whether or not it is done (step S52).

Further, the determination as to whether or not the comb teeth sensor 64 of step S52 and step S62 described later detects the shank movement of the member 63 to be detected is obtained by encoding the rotation angle of the output shaft or the upper shaft of the sewing machine motor 81. It is preferable to set such that the center presser foot 29 is executed at an angle at which the center presser foot 29 becomes a bottom dead center or a position immediately before it.

And in the process of step S52, if the shanghai-dong of the to-be-detected member 63 is detected by the comb teeth sensor 64 of the center presser foot sensor 60A (step S52: YES), the CPU 71 will comb teeth sensor The count for the number of moving comb teeth of 64 is started (step S53).

Then, the CPU 71 detects whether the two contacts 61, 62 of the center presser foot sensor 60A are in an off state (step S54). The detection is repeated until the off state is detected, and when detected, the amount of rising of the central presser foot 29, that is, the cloth thickness, is calculated from the count value for the number of moving comb teeth of the comb teeth sensor 64, thereby the RAM 73 (Step S55).

Then, the CPU 71 refers to the needle counter, temporarily stores the current number of needle movements in the RAM 73 (step S56), and at the same time, the mounting force solenoid so as to be a preset mounting force for sewing thick fabric. The energization control of 66 is executed (step S57).

Further, the CPU 71 performs drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by the height corresponding to the amount of change in the thickness of the cloth obtained in step S55 (step S58).

The process proceeds to step S59 and sewing is continued while the bottom dead center of the center presser foot 29 is pulled up by a predetermined number of needle movements.

Incidentally, in the process of step S59, if the set number of times is not reached (step S59: NO), only step S59 is repeated, but as in the process of step S63 described later, with reference to the needle counter, the final number of needle movements When the process reaches the end of sewing, the process ends. When the process does not reach, the process returns to step S59.

Subsequently, when sewing is performed while the bottom dead center of the center presser foot 29 is pulled up by the set number of needle movements (step S59: YES), the CPU 71 steps the bottom dead center of the center presser foot 29 to its original height. The drive control of the motor 42 is executed (step S60), and the energization control of the mounting force solenoid 66 is executed so as to become the original mounting force set in the sewing data (step S61).

The CPU 71 again determines whether or not the comb teeth sensor 64 of the center presser foot sensor 60A detects the movement of the detected member 63 (step S62), so as to determine the damage of the detected member 63. If copper is detected (step S62: YES), it means that the thick portion of the cloth is still being continued, and the process is restarted from step S53.

In addition, when the comb teeth sensor 64 of the center presser foot sensor 60A does not detect the shank movement of the to-be-detected member 63 (step S62: NO), it means that it has passed through the thick part of the cloth, and therefore the needle count counter In step S63, it is determined whether or not the final number of needle movements for executing a series of sewing set in the sewing data has been reached.

If the final needle movement number is reached (step S63: YES), the needle movement number raising the center presser foot 29 memorized in step S56 or the needle movement number returned to its original height, and stored in step S56 The process of writing the amount of rise and the number of needle movements that continued the rise in the sewing data is executed (step S64), and sewing is finished.

When the final needle movement frequency has not been reached (step S63: NO), the processing returns to step S52 to continue sewing.

In addition, when determining whether the comb teeth sensor 64 of the center presser foot sensor 60A of step S52 detected the shank movement of the to-be-detected member 63, when the comb teeth sensor 64 did not detect a movement, (Step S52: NO) With reference to the needle count counter, it is determined whether the final needle movement number for executing a series of sewing set in the sewing data has been reached (step S65). If the final needle movement number is reached (step S65: YES), the sewing is ended after writing the sewing data of step S64, and if not reached (step S65: NO), the processing of step S52 Return to

Fig. 12 is a flowchart showing the processing of the operation control means 70 at the time of sewing execution after the second time in the selection setting of the thickness acquisition mode during sewing.

First, when sewing is started by driving the sewing machine motor 81 (step S71), the cloth thickness data in the sewing data is referred to by referring to the needle counter that counts the number of needle movements by the encoder of the sewing machine motor 81. It is judged whether or not the number of needle movements in which the increase in the thickness of the cloth which has been indicated or the number of needle movements returned to the original thickness of the cloth is increased (step S72).

If the number of needle movements is not reached, sewing is continued according to the sewing data (step S72: NO), and if it is any one needle movement number (step S72: YES), the process proceeds to step S73.

In step S73, it is determined whether the number of needle movements in which the increase in cloth thickness has occurred or the number of needle movements returned to the original cloth thickness is determined, and in the case of the number of needle movements in which the increase in cloth thickness occurs (step S73: YES), The CPU 71 executes the drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by the height of the cloth thickness increase detected by the center presser foot sensor 60A in the number of needle movements ( Step S74), energization control of the mounting force solenoid 66 is performed so as to become a mounting force set for sewing thick fabric (step S75). The process then proceeds to step S77.

In addition, in the case of the number of needle movements returned to the original cloth thickness from the increase in the cloth thickness (step S73: NO), the CPU 71 steps the bottom dead center of the center presser foot 29 to return to the original height at the raised position. While the drive control of the motor 42 is executed, the mounting force is returned to the normal value (step S76), and the process proceeds to step S77.

In step S77, the CPU 71 refers to the needle counter and determines whether the final needle movement number for performing a series of sewing set in the sewing data has been reached. As a result, when the final needle movement number is reached. (Step S77: YES) When the sewing is finished and it has not reached (step S77: NO), the processing returns to the processing of step S72 and continues sewing.

Fig. 13 is a flowchart showing the processing of the operation control means 70 in selecting and setting the thickness acquisition mode at the time of non-sewing while operating each part by setting the cloth.

First, the drive of the sewing machine motor 81 is started, and the CPU 71 determines whether the comb teeth sensor 64 of the central presser foot sensor 60A has detected the shank movement of the member 63 to be detected (step) S81).

In addition, in step S81, the determination as to whether or not the comb teeth sensor 64 detects the movement of the to-be-detected member 63 detects the rotation angle of the output shaft or the upper shaft of the sewing machine motor 81 by an encoder or the like. It is preferable to set so that the center presser foot 29 may be performed at an angle at which the bottom presser foot is at the bottom dead center or immediately before it.

Then, in the processing of step S81, if the center presser foot sensor 60A detects the movement of the detected member 63 (step S81: YES), the CPU 71 moves the comb teeth of the comb teeth sensor 64. The count is started (step S82).

Then, the CPU 71 detects whether the two contacts 61, 62 of the center presser foot sensor 60A are in an off state (step S83). The detection is repeated until the off state is detected, and when it is detected, the amount of rising of the central presser foot 29, that is, the cloth thickness, is calculated from the count value for the moving number of comb teeth of the comb number sensor 64. 73) (step S84). The CPU 71 also refers to the needle counter, and temporarily stores the current needle movement number in the RAM 73 (step S85).

Then, the CPU 71 refers to the needle counter to determine whether the final needle movement number for performing a series of sewing set in the sewing data has been reached (step S86). When the final needle movement number has not been reached (step S86: NO), the processing returns to step S81.

In addition, when the final number of needle movements is reached (step S86: YES), the sewing machine motor 81 is stopped (step S87), and an increase in the thickness of the cloth stored in the RAM 73 occurs in steps S84 and S85. A process of writing the cloth thickness data indicating the number of needle movements and the cloth thickness into sewing data in the EEPROM 74 is executed (step S88).

If the center presser foot sensor 60A does not detect the shank movement of the member 63 to be detected (step S81: NO), the final needle set in the sewing data with reference to the needle count counter. It is determined whether or not the number of exercise has been reached (step S90). If the final number of needle movements is reached (step S90: YES), the sewing machine motor 81 is stopped and the process proceeds to step S88.

When the needle counter does not reach the final needle movement count (step S90: NO), the processing returns to step S81.

On the other hand, the checking operation and correction can be performed with respect to the amount of rise (cloth thickness) of the central presser foot 29 for each needle movement number of the cloth thickness data written in the sewing data by the processing up to step S88. That is, in step S91, the input of the confirmation operation and the correction support is possible.

That is, if an instruction to end without performing the checking operation is input through the operation panel 75, the process ends (step S91: NO).

In addition, when an instruction to perform a confirmation operation is input through the operation panel 75 (step S91: YES), the sewing machine motor 81 starts restarting (step S92). As a result, the cloth holding mechanism and the center presser foot device 1 are also subjected to operation control in accordance with the sewing data.

Further, the CPU 71 refers to the needle counter, and determines whether or not the number of needle movements in which the increase in the cloth thickness stored in step S85 occurs is generated (step S93).

Then, when the number of needle movements in which the increase in the thickness of the cloth is not generated occurs, the cloth holding mechanism and the center presser foot device 1 continue to operate in accordance with the sewing data (step S93: NO), and the needle in which the increase in the cloth thickness occurs. At the number of movements (step S93: YES), the CPU 71 executes drive control of the stepping motor 42 so that the bottom dead center of the center presser foot 29 rises by the height stored in step S84 (step S94). The drive of the motor 81, the cloth holding mechanism, and the center presser foot device 1 is stopped (step S95).

Then, on the basis of the result of visually confirming the relative positional relationship between the center presser foot 29 and the cloth stopped at the bottom dead center position, if execution of correction for the ascending amount of the center presser foot 29 is instructed (step S96: YES) ), The correction value with respect to the lift amount of the center presser foot 29 can be input (step S97).

Further, if a correction value is input, it is determined whether or not a confirmation instruction input has been made (step S98). If not, the process returns to step S97 to wait for input of the correction value. If the correction value is determined (step S98: YES), the drive of the sewing machine motor 81, the cloth holding mechanism and the center presser foot device 1 is resumed from the next needle movement number, and returns to the processing of step S93.

In addition, in step S96, when the content of inputting that the needle movement number is not corrected is input, the CPU 71 refers to the needle counter and reaches the final needle movement number for performing a series of sewing set in the sewing data. (Step S99), and when the final number of needle movements is not reached (Step S99: NO), the drive of the sewing machine motor 81, the cloth holding mechanism and the center presser foot device 1 is the next number of needle movements. And the process returns to the process of step S91.

If the final number of needle movements is reached, the process proceeds to step S100 (step S99: YES), and the CPU 71 executes a process of writing correction correction amounts set in steps S97 and S98 into sewing data in the EEPROM 74. And the series of processing ends.

On the other hand, sewing is also performed on the sewing data updated in the non-sewing thickness acquisition mode shown in FIG. 13 based on the flowchart of FIG. 12 described above.

(Effects of the Second Embodiment)

The sewing machine 100A has the same effect as the sewing machine 100, and can detect not only the change in the thickness of the cloth to be sewn, but also the amount of change in the thickness thereof. As a result, it is possible to control the height of the bottom dead center of the east side of the center presser foot 29, so that the burden on the cloth by the center presser foot can be suppressed and the high sewing quality can be maintained while protecting the cloth.

In addition, the mounting force adjusting device 65 controls only the output of the mounting force solenoid 66 in accordance with the occurrence of the change in the thickness of the cloth, but controls the mounting force more precisely in accordance with the detected cloth thickness. You may.

The invention described in claim 1 detects a change in the thickness of the to-be-sealed object through the center presser foot, so that an independent contactor is unnecessary, thereby reducing the number of parts, and securing a space for contacting the contactor to the to-be-separated material separately from the center presser foot. There is no need to miniaturize and simplify the apparatus. Therefore, the productivity of the whole apparatus can be aimed at.

In addition, since the change in the thickness of the to-be-sealed object is detected through the center presser foot, detection is made to press the to-be-sealed object from above, so that sliding between the to-be-sealed material and the contactor does not occur as in the prior art, and the shaking is suppressed to detect the thickness with better accuracy. You can do it.

Furthermore, by providing the evacuation member, it is possible to suppress pressurization of the to-be-encapsulated object when the center presser foot is lowered to protect the to-be-encapsulated object, and at the same time, to change the thickness of the to-be-contained object with better accuracy while suppressing the influence of the center presser foot. It can be detected.

The invention according to claim 2 is provided with height adjusting means for adjusting the bottom dead center height of the center presser foot at the time of detecting the thickness change by the thickness change detecting means, whereby the to-be-sealed object is protected and the center presser foot is lowered. When pressurization to the to-be-sealed object is suppressed at the time, the thickness change of the to-be-seamed object can be detected with more precision in the state which suppressed the influence of a center presser foot.

According to the invention of claim 3, since the data of the needle movement number at which the thickness change is generated in accordance with the thickness detection of the sewing object is written in the sewing data, it is known in advance at what needle movement number the thickness change occurs at the next sewing. Since it becomes possible to recognize and control various kinds of thicknesses, it becomes possible to improve the quality of sewing products.

The invention described in claim 4 adds the detection result of the number of needle movements in which the thickness change of the object to be produced is made to the sewing data together with the actual sewing operation, thereby improving the work efficiency.

The invention as set forth in claim 5 adds a detection result of the number of needle movements in which the thickness change of the object is made to the sewing data together with the preliminary sewing operation. This makes it possible to improve the quality of the finished product for the whole to-be-sealed material.

In the invention according to claim 6, since the preliminary sewing is performed again after the number of needle movements in which the change in the cloth thickness is added to the sewing data is performed again, whether the titration point is appropriate for the bottom dead center height of the central presser foot and the relative height of the sewing object. Can be judged.

As a result, in the number of needle movements in which the thickness change of the sewing object occurs, the bottom dead center height of the controlled central presser foot is corrected, and the control means for writing the correction into the sewing data is further added, thereby making more accurate sewing. It is possible to further improve the quality of the sewing product.

The invention according to claim 7 is provided with a mounting force adjusting device for adjusting the tension of the sewing thread when detecting the change in thickness by the thickness change detecting means, so that the mounting force can be appropriately set according to the thickness change of the object to be sealed. It is possible to further improve the quality of the sewing product.

Claims (7)

Center presser foot which presses the to-be-sealed thing to the needle plate upper surface at the time of sewing, A center presser foot driving mechanism for providing a reciprocating motion along the vertical direction to the center presser foot; A cloth thickness change detection device of a sewing machine having a thickness change detection means for detecting a thickness change of an object to be sewn through the center presser foot, The center presser foot drive mechanism includes a evacuation member that performs an escape operation in place of a descending operation of the center presser foot when a load exceeding a predetermined amount when the center presser foot is lowered, And the thickness change detecting means detects a thickness change of the sewing material from the evacuation operation of the evacuation member. The method of claim 1, Height adjusting means for adjusting the bottom dead center height position of the center presser foot in the direction of shanghai up and down; And a presser foot height control means for controlling the height adjusting means so that the bottom dead center height position of the center presser foot moves up and down when detecting the thickness change of the workpiece by the thickness change detecting means. Cloth thickness change detection device. 3. The method of claim 2, Moving means for relatively moving said sewing object to an arbitrary position on said needle plate upper surface with respect to said sewing needle; Sewing control means for performing positioning control on the moving means according to sewing data indicating each position to be positioned for each swing count of the sewing needle; When the position is set to each position by the sewing control means, a control is performed to detect the thickness change of the sewing object by the thickness change detecting means, and the number of needle movements when the thickness change is detected is stored in the sewing data. A cloth thickness change detection device for a sewing machine, comprising: a change needle movement count detection control means for writing. The method of claim 3, The change needle movement number detecting control means performs a process of writing a needle movement number of times the thickness change has occurred in the sewing data when sewing is performed by the sewing control means. . 5. The method of claim 4, The change needle movement count detection control means detects the change in the cloth thickness of the sewing machine, wherein when the preliminary sewing is executed by the sewing control means, a process of writing the needle movement count in which the thickness change occurs in the sewing data is performed. Device. 6. The method of claim 5, And a check operation control means for performing a height checking operation of the moving means and the height adjusting means, in accordance with the sewing data, after the processing of writing the number of needle movements in which the thickness change has occurred. Change detection device. The method of claim 1, A thread tension adjusting device for providing resistance to the unwinding of the sewing thread supplied to the sewing needle; When the thickness change detection means detects a change in the thickness of the object to be sewing, the fabric thickness change detection device of the sewing machine characterized in that it comprises a mounting force control means for controlling to change the resistance applied by the mounting force adjusting device .

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