KR20060063740A - Sewing machine - Google Patents

Abstract

It is an object of the present invention to provide a sewing machine which can freely perform thread relaxation.

The sewing machine 10 is placed on the upper surface of the table and supports the main frame 20 for supporting and storing the overall configuration thereof, and the needle frame 11 so that the sewing machine 10 can move up and down on the main frame 20. The needle bar, a vertical drive mechanism for moving the needle bar up and down by driving the sewing machine motor 3, a transfer mechanism for transferring the object to be placed on the needle plate 13 along the X-axis direction, and the needle plate 13 The cloth presser 12 which presses and presses the above-mentioned to-be-sealed object from upper side, the cloth thickness detection means 30 which detects the thickness of the to-be-sealed material on the needle plate 13, and the cloth thickness detection means 30 is detected by it. And a thread relaxation mechanism 40 as a work means for performing thread relaxation of the sewing thread according to the detected thickness, and an operation control means 80 for performing operation control for each of the above components.

Description

Sewing machine {SEWING MACHINE}

1 is a perspective view showing a main part configuration of a sewing machine 10 according to the present embodiment.

2 is an enlarged perspective view showing the circumferential configuration of the cloth pawl 12 of the present embodiment.

3 is a block diagram showing the configuration of the operation control means 80 of the present embodiment.

4 is an operation explanatory diagram for explaining a sewing operation of the present embodiment.

5 is a flowchart showing a control operation by the operation control means 80 of the present embodiment.

             Explanation of symbols on the main parts of the drawings

3: sewing machine motor 10: sewing machine

11: sewing needle 12: cloth press

13: needle plate 20: body frame

30: cloth thickness detection means 31: detection arm

32: potentiometer 40: thread relaxation mechanism

41: thread relaxation member 45: left and right drive motor (left and right drive means)

52: up and down drive motor (up and down drive means) 80: motion control means (control means)

90: operation panel (input means)

The present invention relates to a sewing machine which can pull out extra thread during sewing.

At the time of sewing of the sewing machine, in order to form a homogeneous needle stitch, a pressing force is applied by a substantially flat cloth presser in the sewing position of the object to be conveyed by the transfer mechanism, that is, in the vicinity of the needle dropping position. For this reason, the sewing position of the to-be-sealed object is compressed by the said pressing force. And the compression part moved in the conveyance direction from the cloth stop position with conveyance is released | released from the pressing force of the cloth press, and is restored to original thickness by repulsive force (restoration force).

In addition, a needle passing through the upper thread from the upper surface side passes through the compressed portion described above, and a lower thread is spread over the upper thread sewn on the needle tip on the lower side of the needle plate, and the needle tip is pulled out from the lower side of the sewing object to the upper side. When the upper thread and the lower thread are tightened, sewing is made (needle stitch is formed).

Here, when stitching a plurality of sewing materials overlapped, for example, when sewing the sleeve of the suit and the length of the clothes, the original shoulder pad even after sewing in the stitches formed on the shoulder pad in accordance with the demand for the quality of completion. It is preferable that the thickness of is maintained. In general, in the sewing machine, needle stitches are formed in the compressed portion by the cloth presser, and thus, when sewing a sewing material having flexibility such as a shoulder pad and having a significantly different thickness when pressed by the cloth presser, There was a problem that the thickness of the stitched part after sewing was significantly thinner and dented compared with the original thickness of the object to be sewn.

In view of the above problem, a sewing machine is known in which a lever for swinging the needle trajectory of a needle which is driven up and down on the upper side of the needle plate crosses the thread so that the upper thread is previously tied and the thread length after sewing is allowed. (See, eg, Non Patent Literature 1). In such a conventional sewing machine, the lever has a structure having cloth thickness detecting means capable of lifting up and down in accordance with the cloth thickness through a link mechanism. Thereby, a certain amount of excess upper thread can be ensured at the time of sewing according to the change of cloth thickness, and the difference between the thickness of the stitched part after sewing and the original thickness of the to-be-sealed material can be alleviated.

[Non-Patent Document 1] DURKOPP, Sewing Machine, D697 Part Book

However, in the conventional sewing machine presented in the non-patent document 1, the cloth thickness detecting means for detecting the thickness of the original fabric has a long hole and a rod connected by a pin engaged with the long hole. The lifting amount in the vertical direction of the lever with respect to the amount of change in the thickness of the cloth is only adjustable at a constant ratio. That is, only linear (primary) change is possible with respect to the change in the thickness of the cloth, and the response to the change in the thickness of the cloth was an approximation based only on the original cloth thickness. In addition, since the ratio adjustment is a manual operation, it cannot be executed during sewing, and there is a problem that sewing should be performed at a constant ratio.

Moreover, the length of the excess yarn is simply determined based only on the original thickness of the fabric detected by the cloth thickness detecting means, and when sewing the sewing material having different elasticity or restoring force, the long hole and the pin as the connection portion must be readjusted. It was. The adjustment of the pin engaging with such a long hole is troublesome because it is made by a worker's manual work, and there is a problem in that reproducibility is low when sewing the sewing material of the same material due to difficulty in fine adjustment.

In addition, the swinging motion of the lever in the left and right directions is such that the operation or stop can be switched. The swing width in the left and right directions cannot be adjusted according to the thickness of the fabric and the amount of recovery. That is, there was a problem that the amount of securing the upper thread according to the thickness of the cloth could not be adjusted depending on the left and right motions.

In addition, the rocking motion of the lever in the left and right directions is configured to transmit the rotation of the main shaft of the sewing machine through the gear, and the rotation speed is halved and transmitted. Therefore, each time the needle driven up and down in synchronization with the sewing machine main shaft moves up and down two times, the lever is configured to reciprocate one side to the left and right. For this reason, the driving pattern of the lever in the left and right directions is such that the lever can cross the lower side of the lever whenever the needle is raised, and there is a problem that the operation pattern cannot be changed.

It is an object of the present invention to provide a sewing machine which can freely perform thread relaxation.

In order to solve the said subject, invention of Claim 1 is the needle drive mechanism which drives a needle up and down, the transfer mechanism which conveys the to-be-sealed material on a needle board in synchronization with the said needle drive mechanism, The pressing direction for pressing the to-be-sealed material and the needle thread interposed between the needle and the to-be-sealed material by traversing the shanghai path of the needle in the direction intersecting with the conveying direction so as to draw the length of the thread with ease. In the sewing machine having a thread relaxation mechanism having a thread relaxation member disposed along the

The thread relaxation mechanism has cross direction driving means for driving the thread relaxation member so as to cross the shanghai path of the needle in a direction crossing the transfer direction for every needle stitch,

And a control means having a function of controlling the driving frequency or the driving amount of the cross direction driving means.

In the invention according to claim 1, the thread relaxation member of the thread relaxation mechanism is driven by the cross directional drive means, and the drive frequency, the drive amount or the drive speed of the cross directional drive means is controlled by the control means. That is, the thread loosening member of the thread loosening mechanism can freely set or change the driving frequency, the driving amount, or the driving speed in the direction intersecting with the shank-dong of the needle in the control means. Therefore, it is driven in the left and right directions by the cross direction driving means.

In the invention according to claim 2, in the sewing machine according to claim 1, the thread relaxation mechanism includes a vertical drive means capable of driving the thread relaxation member in a vertical direction, and a thickness of the object to be conveyed by the transfer mechanism. It has a thickness detecting means for detecting the, characterized in that the control means has a function of controlling the vertical drive means based on the detected thickness of the thickness detecting means.

In the invention according to claim 2, the thickness of the object to be conveyed to the sewing position by the transfer mechanism is detected by the thickness detecting means. In addition, the thread relaxation member of the thread relaxation mechanism is moved up and down by the vertical driving means. The vertical drive means is driven and controlled by the control means based on the detected value detected by the thickness detection means, that is, the original thickness of the object to be sealed. That is, the original thickness of the to-be-sealed object detected by the thickness detecting means is output to the control means, and the lifting amount of the thread loosening member is stored in the control means or calculated in accordance with the setting in the control means, and the upper and lower driving means are calculated. As feedback is made in real time, sewing is done to accurately draw the length of the thread to be secured per needle.

The invention according to claim 3 is characterized in that, in the sewing machine according to claim 2, the control means has a function of controlling the cross direction driving means based on the detected value of the thickness detecting means.

In the invention according to claim 3, the driving direction of the cross direction driving means of the thread relaxation mechanism is controlled by the control means for controlling the cross direction driving means based on the original thickness of the to-be-sealed object detected by the thickness detecting means. . That is, the original thickness of the to-be-sealed material conveyed by the transfer mechanism is detected by the thickness detecting means, and the detected value is output to the control means. The control means also controls the driving of the cross direction driving means in addition to the vertical driving means based on the detected value.

(Overall Configuration of Embodiments)

An embodiment of the present invention will be described based on FIGS. 1 to 5. 1 is a perspective view showing the configuration of main parts of the sewing machine 10.

Here, the direction in which the sewing needle 11, which will be described later, moves up and down is referred to as the Z-axis direction (up and down direction), and one direction orthogonal to this (the conveying direction of the object to be sealed) is made as the X-axis direction (front and rear direction), The direction orthogonal to both directions of the X-axis direction and the Z-axis direction is defined as the Y-axis direction (left and right directions). In addition, the needle plate 13 provided on the upper side of the sewing machine bed 21 in the sewing machine 10 is assumed to be provided in parallel to the X-Y plane.

The sewing machine 10 of this embodiment is a sewing machine which sews a thick material, for example, a pad, etc. with respect to a cloth to be sewing, and has a configuration suitable for sewing thicker than normal. In the following description, in the case of simply referred to as "sealed material", the thing in the state which overlapped cloth and a pad shall be shown.

The sewing machine 10 includes a main body frame 20 supporting and storing the overall structure of the sewing machine 10, a needle bar supported so as to move up and down on the main body frame 20 while maintaining the sewing needle 11, and the sewing machine motor 3 The up and down drive mechanism as a needle drive mechanism for moving the needle bar up and down by the drive of the < Desc / Clms Page number 5 >), a transfer mechanism for transferring the to-be-sealed material placed on the needle plate 13 along the X-axis direction, and the to-be-sealed material on the needle plate 13; The cloth presser 12 constituting the pressing mechanism which presses the pressure from above, the cloth thickness detecting means 30 for detecting the thickness of the object to be sealed on the needle plate 13, and the cloth thickness detecting means 30. A thread relaxation mechanism 40 as a work means for performing thread relaxation of the sewing thread according to the detected detection thickness, and an operation control means 80 for performing operation control for each of the above components.

(Body frame)

The main body frame 20 includes a sewing machine bed portion 21 having a needle plate 13 on an upper surface of its one end portion, a vertical body portion 22 that stands up from the other end side of the sewing machine bed portion 21, and a vertical length. A sewing machine arm portion 23 which protrudes continuously in the same direction as the sewing machine bed portion 21 from the upper end of the body portion 22 is provided, and is generally formed in an approximately X shape.

(Sewing needle)

The sewing needle 11 is reciprocated along the Z-axis direction by a vertical drive mechanism through a needle bar (not shown) supported by the main body frame. The upper needle (not shown) is sewn in the vicinity of the tip of the sewing needle (11), and the upper thread is passed through the sewing material on the upper surface of the needle plate (13) in accordance with the reciprocating motion in the Z-axis to the lower side of the needle plate (13). The sewing is tied to the bobbin wound by a drum (not shown).

(Up and down drive mechanism)

The upper and lower driving mechanisms, not shown, are fixed to the main frame and arranged to rotate in the Y-axis direction in the sewing machine arm 23 and the upper and lower metal bearings that support the upper and lower ends of the needle bar to be slidable. An upper shaft, a sewing machine motor 3 for rotating the upper shaft, a rotary weight fixed to the end of the upper shaft, and a crank rod for connecting a needle bar and a portion eccentric from the rotation center of the rotary weight.

Then, when the upper shaft and the rotary rod are rotated by the sewing machine motor 3, the crank rod converts the rotational driving force to the shankdong driving force with respect to the needle bar and transmits it, so as to reciprocate in the vertical direction.

(Cloth press)

2 is an enlarged perspective view showing the configuration around the cloth stopper 12. The cloth tab 12 has a square frame shape, and the inside of the cloth tab 12 penetrates up and down. Then, the sewing needle falls on the inside of the cloth press 12, so that sewing is performed on the inside of the cloth press 12. The thread loosening member 41 also moves in the Y-axis direction within the frame of the cloth stopper 12.

The cloth pawl 12 is held at the lower end of the cloth pawl support rod 14 supported to move in the Z-axis direction from the lower end of the sewing machine arm portion 23, and the cloth pawl support rod 14 Is moved up and down by a pusher stepping motor (not shown).

That is, the operation control means 80 controls the pressing stepping motor according to the cloth thickness detected by the cloth thickness detecting means 30 at the time of sewing to adjust the height of the cloth pressing 12 to press the cloth at an appropriate height. The action is intended to be executed.

(Transportation mechanism)

The conveying mechanism (not shown) has a conveying gear which is located below the needle plate 13 and emerges on the upper surface of the needle plate, and a conveying mechanism which moves the conveying gear in the conveying direction along the X-axis direction. Such a transmission mechanism moves the sewing gear in a predetermined direction (plus feed direction) in the X-axis direction while appearing on the upper surface of the needle plate 13 by the drive of the sewing machine motor. In addition, the transfer operation of the transmission mechanism is performed periodically in synchronization with the shanghai movement of the sewing needle (11). As a result, the transfer mechanism is configured to transfer the to-be-sealed material on the needle plate 13 in sewing pitch units.

(Cloth thickness detecting means)

The cloth thickness detecting means 30 detects a detection arm 31 and a swinging angle of the detection arm 31 whose tip portions are in contact with the sewing object on the needle plate 13 in the vicinity of the cloth pawl 12. Potentiometer (32) which is an angle detecting means is provided. The potentiometer 32 is disposed below the tip of the sewing machine arm portion 23.

The potentiometer 32 has a detection shaft which can be rotated, and the detection shaft is supported inside the main body frame 20. The potentiometer 32 has a function of outputting a signal corresponding to the rotational angle generated on the detection shaft to the operation control means 80, and supports the proximal end of the detection arm 31 by the detection shaft.

The detection arm 31 has its proximal end supported by the detection axis of the potentiometer 32, and its proximal end suspended obliquely downward in a direction orthogonal to the detection axis. The tip end of the detection arm 31 is landed at a position adjacent to the Y-axis direction of the cloth stopper 12 on the upper surface of the needle plate 13, and the sewing object set on the upper surface of the needle plate 13 during sewing. It is arranged to abut on the top. Therefore, at the time of sewing, the detection arm 31 is rotated according to the thickness of the sewing object, and the detection axis of the potentiometer 32 on the proximal end side outputs a signal to the operation control means 80 by the rotation angle corresponding to the thickness. The operation control means 80 calculates the thickness of the object to be sealed from the detection rotation angle and the known length of the detection arm 31.

(Thread relaxation apparatus)

The thread relaxation mechanism 40 is temporarily wound in a sewing thread sewn into the sewing object by traversing the Shanghai east path of the sewing needle 11 in the direction (Y axis direction) intersecting with the conveying direction (X axis direction). Through the thread loosening member 41 for relaxing the thread, the holding body 42 of the thread loosening member 41 supported so that rotation and shank movement with respect to the cloth clamp support rod 14, and the holding body 42 are possible. The left and right drive mechanism 44 serving as a cross-direction driving means for rotating the thread relaxing member 41 around the Z axis direction, and the thread relaxing member 41 being moved along the Z axis direction through the retainer 42. A vertical drive mechanism 51 is provided as the vertical drive means.

The holder 42 is disposed slightly above the cloth tab 12 near the lower end of the cloth tab support rod 14. The holder 42 has a through hole formed therein, and the cloth pawl support rod 14 is inserted into the through hole to move along the cloth pawl support rod 14, and the cloth pawl support rod 14 is formed. It is possible to rotate around the center.

The thread-releasing member 41 is fixedly equipped with its proximal end to the retainer 42, and is provided once in succession (along the X-axis direction) in a direction orthogonal to the cloth pawl support rod 14 from the proximal end. A U-turn is made along the way, and the front-end part is provided in the opposite direction. Further, the thread loosening member 41 is arranged such that the tip end side portion 41b and the proximal end side portion 41a are mutually parallel with each other, but are displaced with respect to the Y-axis direction and the Z-axis direction at the boundary of the bent portion. .

As mentioned above, since the holding body 42 is supported so that rotation is possible about the cloth clamp support rod 14, the thread loosening member 41 also rotates centering around the support rod 14 similarly. The thread loosening member 41 is arranged to pass through the shanghai copper path of the sewing needle 11 by the rotation thereof.

In addition, the thread loosening member 41 is reciprocated by a left and right drive mechanism 44 in a predetermined angle range across the shanghai copper path of the sewing needle 11, the thread loosening member 41 is approximately X-axis direction The reciprocating rotation is performed in the angle range which maintains the state (at least the range which becomes the state along the X-axis direction rather than the Y-axis direction).

The right and left drive mechanism 44 is a cross-direction driving means for driving the thread loosening member 41 so as to cross the shanghai copper path of the sewing needle 11, the needle thread is sewn and driven up and down in the direction intersecting the conveying direction. The main body frame is constituted by a left and right drive motor 45 serving as a driving source of rotation of the thread relaxation member 41, a drive arm 46 connected to the proximal end of the output shaft of the left and right drive motor 45, and a support member (not shown). A support shaft 47 supported to be rotatable by the 20, an input arm 48 fixed to the upper end of the support shaft 47, and an output arm 49 fixed to the lower end of the support shaft 47. ) And a linking body 50 for connecting the pivoting end of the input arm 48 and the pivoting end of the driving arm 46.

The left and right driving motor 45 is a pulse motor (stepping motor) capable of controlling the driving frequency and the driving amount (rotation amount) in accordance with the pulse signal from the operation control means 80, which will be described later, whose output axis is the Z axis. It is fixed to the main body frame 20 so that a direction may follow. The drive arms 46 are successively provided in a direction perpendicular to the output shaft of the drive motor 45.

The support shaft 47 is supported by the main body frame 20 so as to be parallel to the Z axis direction. And the input arm 48 and the output arm 49 are provided in the direction orthogonal to the support shaft 47 in the upper end part and the lower end part of the support shaft 47, respectively. Further, since the driving arm 46 and the input arm 48 are connected to each of the rotational ends by the connecting link member 50, the respective arms 46 and 48 are driven by the left and right driving motors 45. FIG. The support shaft 47 and the output arm 49 can be rotated through the link member 50. In addition, the sewing needle 11 driven by the left and right drive mechanism 44 in the left and right directions is reciprocated up and down by the up and down drive mechanism, above the thread loosening member 41. It goes without saying that it is controlled to execute when located on the side.

The output arm 49 is formed in a shape in which the rotating end portions successively provided are separated into two branches, and is engaged in a state where the engaging projection 43 projecting upward from the holding body 42 enters the inside. have. The engaging projection 43 is projected to the holder 42 so as to be parallel to the cloth presser support rod 14 inserted into the through hole of the holder 42, and is fitted with a through hole to provide a thread relaxation member ( It is provided in the edge part on the opposite side to 41). By this arrangement, when the output arm 49 is swung by the drive of the left and right driving motor 45, the retaining member 42 and the thread loosening member 41 are supported by a cloth pressing support rod through the engaging projection 43. 14) is rotated around the axis, and further, the front end side portion 41b of the thread loosening member 41 can be moved along the Y-axis direction.

The vertical drive mechanism 51 includes a drive arm 53 which is connected to a vertical drive motor 52 serving as a driving source of the shank-dong of the thread relaxation member 41, and a proximal end of the output shaft of the vertical drive motor 52, which is not shown. A linkage connecting the actuating link member 54 whose one end is rotatable to the main body frame 2 by the support member and the intermediate end position of the actuating link member 54 and the pivoting end of the driving arm 53. The link body 55 is provided.

Similarly to the left and right drive motor 45, the vertical drive motor 52 is a pulse motor capable of controlling the driving frequency and the driving amount (rotation amount) according to the pulse signal from the operation control means 80 described later. As a (stepping motor), the main body frame 20 is fixed to the main frame 20 so that its output shaft is along the Y-axis direction. The drive arms 53 are successively provided in a direction perpendicular to the output shaft of the drive motor 52. Furthermore, since the one end of the linking link member 55 is connected to the rotational end of the drive arm 53, when the drive arm 53 is rotated by the drive of the up and down drive motor 52, the linking link member 55 ) Can be reciprocated along its approximately longitudinal direction.

As described above, the working link member 54 is axially supported by the main body frame 20 by a supporting member (not shown). At the other end of the working link member 54, a boss-like protrusion 56 protruding in the direction orthogonal to the longitudinal direction is formed. The groove part 57 is formed in the side surface of the said holding body 42 in parallel with the direction (approximately X-axis direction) in which the thread relaxation member 41 is provided in series, and the projection 56 is a part of the groove part 57. The engagement between the working link member 54 and the retainer 42 in the inserted state is achieved. Furthermore, since the linking linkage 55 is connected to the longitudinal intermediate position of the actuating linkage 54, when the up and down drive motor 52 is driven, the drive link 53 and the linking linkage 55 are provided. The working link member 54 can be rotated about its one end, and as a result, the retainer 42 and the thread loosening member 41 are moved through the projection 56 at the other end of the working link member 54. It can be moved up and down with the cloth stopper support rod 14.

(Operation control means)

The operation control means 80 is a control means for controlling the entire operation of the sewing machine 10. As shown in the block diagram of FIG. 3, the CPU 81, the RAM 82, the ROM 83, and the EEPROM 84 are shown. ) And the like. In addition to the operation panel 90 (input means), the operation control means 80 is connected to a spindle drive circuit, a pedal device, a rotation speed detection circuit, a head rotation angle detection circuit, a comparison judge, and the like, which are not shown. .

Specifically, the CPU 81 sewing machine to the main shaft drive circuit based on signals output from the operation panel 90 (input means), a pedal device not shown, a rotation speed detection circuit, a head rotation angle detection circuit, or the like. By carrying out a drive control command for the motor 3, it is configured to optimally control the amount of current flowing in the sewing machine motor 3 to control the rotational speed of the sewing machine motor 3. The RAM 82, which is a storage means, becomes a work area such as storing temporary data in the processing of the CPU 81. In the ROM 83, a control program for the CPU 81 to perform each processing is stored. have. The EEPROM 94 is a nonvolatile memory that can be stored without being erased even when the sewing machine 10 is turned off. The EEPROM 84 can update each operation control program, sewing data, and the like. Stored.

And the operation panel 90 is connected to the operation control means 80 of this embodiment, and it is possible to set or change the operation pattern etc. of the sewing machine 10 by an operator's input operation. In addition, in this embodiment, the left and right drive motor 45 and the up and down drive motor 52 of the thread relaxation mechanism 40 are connected, and the said left and right drive motor 45 and the top and bottom via the operation panel 90 mentioned above. It is comprised so that each setting value for controlling the drive frequency, the drive amount, etc. of the drive motor 52 can be input.

Although not shown in FIG. 1, the operation panel 90 is installed above the main body frame 20, and transmits each set value input by the operator's operation to the operation control means 80 as an output signal.

Then, the operation control means 80 of the present embodiment measures the driving frequency and the driving amount of the left and right driving motor 45 and the vertical driving motor 52 based on the detected values of the cloth thickness detecting means 30 described above. It has a function to control. Specifically, the operation control means 80, the left and right drive motor 45 or the vertical drive motor for the value (cloth thickness) detected by the cloth thickness detecting means 30 in accordance with the input operation from the operation panel 90 described above. It has a function of controlling to determine the driving amount of 52. That is, for example, when the original thickness of the cloth detected by the cloth thickness detecting means 30 is h, the amplitude in the left and right directions by the left and right driving motor 45 is a * h and the up and down by the up and down driving motor 52. Has a function of performing control to set the amount of movement in the direction to b * h (a and b can be set and input by the operation panel 90). In addition, each setting value (for example, a, b, etc.) input through the operation panel 90 is stored in the EEPROM 84 of the operation control means 80 to be stored. That is, by arbitrarily changing the values of a and b, it is possible to oscillate at an arbitrary amplitude. In addition, it is also possible to add a predetermined set value to the detection thickness so as to control the amplitude in the left and right directions or the movement amount in the vertical direction.

The operation control means 80 also has a function of accepting an input (setting or changing) from the operation panel 90 even during the sewing operation.

In addition, the operation control means 80 is capable of setting the left and right frequencies (driving frequency), that is, thinning rate, etc. of the thread loosening member 41 according to the input operation from the operation panel 90. . Specifically, for example, when the control (interval) for driving (vibrating) the thread loosening member 41 once every n times of needle dropping times is performed, the set value n is changed to the operation panel 90. Is to be set via More specifically, it has a function of controlling the left and right driving motor 45 to be driven when the number of revolutions of the output shaft of the sewing machine motor 3 is counted to approximately n.

Further, the operation control means 80 controls to change the driving amount of the thread loosening member 41 when the cloth thickness detected by the cloth thickness detecting means 30 becomes equal to or greater than a predetermined value (for example, ds). Has the function. Specifically, when the operation control means 80 is less than the detection thickness ds, the amplitude in the left and right directions by the left and right drive motor 45 is a * h and the up and down by the up and down drive motor 52 as described above. When the movement amount in the direction is set to b * h, and the detection thickness ds or more, as described above, the amplitude in the left and right directions by the left and right drive motor 45 remains a * h, but the vertical drive motor ( The amount of movement in the up and down direction by 52) is controlled by b '* h. At this time, the constant values ds and b 'can be set by input operation on the operation panel 90. If there is a setting, the operation control means 80 stores each setting value in the EEPROM 84 described above. To make it work.

Next, the operation of the sewing machine 10 according to the present embodiment will be described in detail with reference to the drawings.

First, when the cloth to be sealed is conveyed between the needle plate 13 and the tip (lower end) of the detection arm 31 by the transfer operation of the transfer mechanism, the tip of the detection arm 31 is raised according to the thickness of the cloth. The detection arm 31 rotates around the detection axis of the potentiometer 32. And the potentiometer 32 detects the rotation angle of the detection shaft which rotates with the rotation of the detection arm 31. As shown in FIG. The detected angle is an electric signal corresponding to the rotation angle and is output to the operation control means 80.

The detection signal from the cloth thickness detecting means 30 is recognized by the CPU 81. The CPU 81 stitches 11 in accordance with an operation control program stored in RAM 82, ROM 83, EEPROM 84, and the like, which are storage means based on the thickness of the cloth calculated from the detection signal. The left and right drive motor 45 and a signal indicating the drive amount for driving the thread loosening member 41 in the direction (left and right directions) intersecting with the shanghai east path of the sewing needle 11 while ascending to this upper value. Output to the vertical drive motor 52. In addition, the left and right drive motor 45 outputs a drive amount signal intermittently in accordance with the set drive frequency. Then, based on the output signal, the left and right drive motor 45 and the vertical drive motor 52 is driven, the thread loosening member 41 is driven in the vertical direction and the left and right directions. In addition, the needle thread is temporarily wound on the distal end side portion 41b of the thread loosening member 41 according to the driving of the thread loosening member 41, and the length according to the cloth thickness for each sewing operation for one needle (one pitch). The sewing thread is secured.

Next, the operation of securing the excess thread at the time of sewing by the thread relaxation mechanism 40 will be described in detail with reference to the operation explanatory diagram shown in FIG. 4 is a schematic view when the vicinity of the needle plate 13 on which sewing is made is seen from the upper side (Z-axis direction).

First, the cloth is conveyed from the lower side along the X-Y plane in FIG. 4. a1 is a needle dropping position, and the front end side portion 41b of the thread loosening member 41 is waiting for the needle dropping position a1 in a state inclined to the left side of FIG. 4 (see FIG. 4A).

Next, when the fabric is conveyed to the upper side (X-axis direction) of FIG. 4 with the conveying operation of the conveying mechanism, the tip of the sewing needle 11 which has escaped from the fabric at the first needle dropping position a1 and rises is the tip. The left and right driving motor 45 is driven while being located above the side portion 41b, so that the thread loosening member 41 moves to the right side of the needle dropping position a1. At this time, the upper thread spanned between the needle dropping position a1 and the tip of the sewing needle 11 is biased to the right of the needle dropping position by the tip side portion 41b. As the upper thread enters the next needle dropping position a2 together with the front end of the sewing needle 11, the upper thread hangs on the front end side portion 41b (see Fig. 4 (b)). When the sewing needle 11 is pulled out from the needle dropping position a2, the tip side portion 41b moves to the left. As the sewing needle 11 enters the third needle dropping position a3, the upper thread hangs on the tip end portion 41b (Fig. 4 (c)). Thus, whenever the needle reciprocates up and down twice by the up-and-down driving mechanism, the thread loosening member 41 reciprocates once in the left-right (Y-axis) direction, and guides the upper thread to the left and right, and the tip-side portion 41b. The thread hangs over. The upper thread spreading over the tip end portion 41b moves in the conveying direction (X-axis direction), that is, the upper side of FIG. 4 with the conveying operation, and the needle drop is repeated (FIGS. 4 (d) to (f)). ), When the open end of the tip end portion 41b is broken, the excess thread is secured away from the tip end portion 41 (see Fig. 4 (g)). In this case, the length of the excess thread is determined for each pitch based on the cloth thickness detected by the cloth thickness detecting means 30 described above, and the driving amount of the left and right driving motor 45 and the vertical driving motor 52 are determined. The control to secure the optimum length is made by controlling the driving amount of.

Further, the operation control means 80 is the left and right driving motor 45 or the vertical driving motor with respect to the value (cloth thickness) detected by the cloth thickness detecting means 30 in accordance with the input operation from the operation panel 90 described above. Control to determine the driving amount of 52. That is, for example, when the original thickness of the cloth detected by the cloth thickness detecting means 30 is h, the amplitude in the left and right directions by the left and right driving motor 45 is h * a and the vertical driving motor 52 is used. Control is made such that the movement amount in the vertical direction is h * b (a and b can be set and input via the operation panel 90). In addition, values (a, b, etc.) input from the operation panel 90 are stored and stored in the EEPROM 84. In other words, it is possible to oscillate at an arbitrary amplitude by arbitrarily changing the values of a and b.

In addition, the operation control means 80 receives an input (set or change) from the operation panel 90 even during the sewing operation.

In addition, the operation control means 80 enables setting of the left and right frequency (drive frequency), thinning rate, and the like of the thread loosening member 41 by the input operation from the operation panel 90. Specifically, for example, when the control (interval) for driving (vibrating) the thread loosening member 41 once every n times of needle drop is performed, the set value n is set on the operation panel 90. To be set. More specifically, the number of revolutions of the output shaft of the sewing machine motor 3 is counted to control the left and right drive motors 45 to be driven when the count value becomes n.

Furthermore, when the cloth thickness value is equal to or greater than the predetermined value ds, the control is made to change the ratio of the thread loosening amount determined based on the cloth thickness value, so that free and colorful sewing can be performed without remaining constant.

Next, the control operation of the operation control means 80 will be described in detail based on the flowchart shown in FIG.

First, when the start switch is operated, the sewing machine motor 3 as the main motor is driven (step S1). In accordance with the operation of the sewing machine motor 3, the CPU 81 determines whether the output shaft of the sewing machine motor 3 is the thread relaxation start angle (step S2). That is, the sewing needle 11, which is driven up and down by the up and down driving mechanism in accordance with the rotation of the output shaft of the sewing machine motor 3, is in a range above the thread loosening member 41, so that the thread loosening member 41 The CPU 81 determines whether the timing of crossing the shank east path of the sewing needle 11 is.

Then, when the output shaft of the sewing machine motor 3 is at the starting angle of the thread relaxation operation (step S2; Yes), that is, when the sewing needle 11 becomes the upper value, the thinning counter provided in the operation control means 80 The count is counted as one count, and the count is added sequentially according to the rotation speed of the sewing machine motor 3 (step S3), and the number is stored in the operation control means 80. Then, when the CPU 81 recognizes that the set value M stored in the storage means, that is, the number of movements (interval) in the left and right directions relative to the number of times the sewing needle 11 moves up and down, has been recognized. (Step S4), the accumulated count number is returned to zero again (Step S5), and the cloth thickness d detected by the cloth thickness detecting means 30 is stored in the storage means or through the operation panel 90. It is determined whether the input or changed cloth thickness ds has been exceeded (step S6). That is, the CPU 81 makes a determination as to whether or not the cloth thickness d detected by the cloth thickness detecting means 30 has exceeded the threshold ds for starting the thinning operation. If the cloth thickness does not exceed the above-described threshold (step S6; No), for example, the left and right driving motors 45 are d * a and the up and down driving motors 52 are d * b (a, b outputs a signal for driving in the left-right direction and the up-down direction with the drive amount of the settable value (step S7). Then, the process returns to step S2.

Further, when the thickness of the cloth exceeds the above-described threshold (step S6; Yes), for example, the left and right driving motor 45 is d * a and the up and down driving motor 52 is d * b '(for the cloth thickness d). b 'outputs a signal for driving in each of the left and right directions and the up and down directions as the driving amount of the settable value (step S12). Then, the process returns to step S2.

In addition, when the number of counts does not reach the thinning set value M in step S4 (step S4; No), the vertical drive motor (in accordance with the cloth thickness d, step S8) detected by the cloth thickness detecting means 30 The control for driving only 52) with the driving amount of d * b is made (step S9). That is, when the count, that is, the number of needle drops, does not reach the set number of thinnings, driving in the left and right directions is not performed, and only the vertical lifting and lowering operation that follows the thickness of the fabric is performed. Control is made. After that, it is again determined whether the output shaft of the sewing machine motor 3 is the thread relaxation start angle (step S2).

Further, when the output shaft of the sewing machine motor 3 is not the thread relaxation start angle in step S2 (step S2; No), the driving amount in the left and right directions corresponding to the cloth thickness d through the operation panel 90 during the sewing operation. Control is performed to determine whether an input operation is performed to change the coefficient a for determining the coefficient a and the coefficient b for determining the amount of driving in the vertical direction corresponding to the cloth thickness d (step S10). Then, when an input operation for changing the set values a and b is made (step S10; Yes), after control is performed to store the changed values as new drive amounts for the left and right directions and the up and down directions, respectively (step S11). The determination is made as to whether the output shaft of the sewing machine motor 3 is the thread relaxation start angle (step S2). Further, when no input operation for changing the set values (a, b) is made (step S10; No), the process proceeds to step S2 again to determine whether the output shaft of the sewing machine motor 3 is the thread relaxation start angle. (Step S2).

As described above, according to the sewing machine 1 according to the present embodiment, the thread relaxation member 41 of the thread relaxation mechanism 40 controls the amount of rotation in which the drive source of the left and right drive mechanism 44 is independent of the sewing machine motor 3. Since the motor is possible, the left and right drive mechanism 44 can freely set or change the drive frequency, the drive amount, the drive speed, and the like in the left and right directions by the operation control means 80. Therefore, compared with the conventional sewing machine having the thread loosening member 41 which drives by driving the drive force divided from the sewing machine motor 3, the driving frequency, the drive amount, the driving speed, etc. of the thread loosening member 41 in the left-right direction etc. Can be freely set or changed to execute control for driving. This makes it possible to relax the thread with a margin or a little less in the sewing operation per needle (1 pitch). Therefore, according to the thickness and the material of various to-be-sealed objects, the sewing which maintains the original thickness of the to-be-sealed thing can be performed after sewing, and desired desired quality can be obtained without damaging the original thickness of the to-be-sealed thing.

In addition, the thread loosening member 41 of the thread loosening mechanism 40 is driven by the control program of the motion control means 80 based on the original thickness of the to-be-sealed object detected by the cloth thickness detecting means 30. Can be controlled. Therefore, as compared with the case of manual adjustment, the lifting amount in the up and down direction can be freely set or changed. This makes it possible to finely set the length of the yarn to be secured (relaxed) in a sewing operation per needle (one pitch), and to maintain the original thickness of the object to be sealed even after sewing. Further, the up and down drive mechanism 51 is controlled by the operation control means 80 which performs control of the up and down drive mechanism 51 based on the detection thickness detected by the cloth thickness detection means 30. Therefore, the original thickness of the to-be-sealed material conveyed to the sewing position is fed back in real time, so that a thread of a length that exactly corresponds to the original thickness of the to-be-sealed material can be secured every needle.

In addition, the operation control means 80 has a function of controlling the drive of the left and right drive mechanism 44 based on the thickness of the object to be detected detected by the cloth thickness detection means 30, and thus is conveyed by the transfer mechanism. The original thickness of the to-be-sealed product can be fed back in real time with respect to the driving in the left-right direction, so that a thread of a length to be secured with room for each needle can be accurately secured. In addition, since the operation of the left and right drive mechanisms 44 in addition to the up and down drive mechanisms 51 can be controlled based on the original thickness of the sewing object detected by the cloth thickness detecting means 30, it is conveyed to the sewing position. Corresponding to the original thickness of the object to be sewn, the needle frequency can be formed according to various sewing conditions or sewing patterns by arbitrarily combining the driving frequency, the driving amount, and the driving speed of the upper and lower driving mechanisms 51 and the left and right driving mechanisms 44. Can be.

In addition, since the left and right drive motor 45 for driving the thread loosening member 41 to the left and right and the vertical drive motor 52 for driving up and down are all configured to apply a pulse motor, the motion control means 80 The storage means (RAM 82, ROM 83, EEPROM 84, etc.) provided can store settings such as the driving amount and the driving frequency, and can improve the reproducibility when sewing the same to-be-sealed material. Therefore, the time required for setting the sewing conditions can be greatly shortened, and the work efficiency can be greatly improved.

In addition, since the drive frequency and the driving amount of the thread relaxation member 41 can be set and changed only by an input operation through an operation panel connected to the operation control means 80, it is more complicated to operate than the case of manual adjustment. This is unnecessary. Therefore, the time required for setting and changing can be significantly shortened.

In addition, since numerical control is made possible by setting input through the operation panel 90, the reproducibility of the same sewing operation is high, the quality of the sewing product can be smoothly switched, and the productivity can be improved.

The left and right drive motor 45 and the up and down drive motor 52 may be controlled by the operation control means 80, and the driving frequency and the driving amount thereof may be controlled. For example, the left and right drive motors 45 and the vertical drive motors 52 may be servo motors or the like.

According to the invention as set forth in claim 1, the thread relaxation member of the thread relaxation mechanism can be driven by the cross direction driving means, and the cross direction driving means is driven by the control means in the left and right directions, the driving amount, the driving speed, and the like. Can be freely set or changed. Therefore, as compared with the conventional sewing machine having a thread loosening member driven by gaining the driving force divided by the sewing machine motor, the driving frequency or the driving amount of the thread loosening member in the left and right directions can be freely set, and furthermore, during sewing Control to change the driving frequency and the driving amount can also be executed. Accordingly, it is possible to set the length of the thread that can be pulled out in the sewing operation per needle (1 pitch) to a desired value or to give a desired change. Therefore, various sewing is possible according to the thickness and raw material of various to-be-sealed objects.

According to the invention as set forth in claim 2, in addition to obtaining the same effect as the invention as set forth in claim 1, in particular, the thread loosening member of the thread loosening mechanism is a control means based on the original thickness of the to-be-sealed object detected by the thickness detecting means. It is possible to control the driving by this. Therefore, compared with the conventional sewing machine, in which the lifting amount can be changed at a constant rate by having the detection arm connected through the long hole and the pin, the lifting amount in the up and down direction can be freely set or changed. As a result, the length of the yarn to be secured in the sewing operation per needle (1 pitch) can be finely set, and sewing can be performed to maintain the original thickness of the object to be sewing even after sewing. Furthermore, since the driving of the up and down driving means is controlled by the control means for controlling the up and down driving means based on the detected thickness detected by the thickness detecting means, the original thickness of the to-be-sealed material conveyed to the sewing position is real time. It can be fed back, so that the thread of the relaxed length which exactly corresponds to the original thickness of the to-be-sealed material per needle can be pulled out.

According to the invention as set forth in claim 3, in addition to obtaining the same effect as the invention as set forth in claim 2, the control means in particular controls the driving of the cross-direction driving means based on the thickness of the to-be-sealed object detected by the thickness detecting means. By having the function to do this, the original thickness of the to-be-sealed material conveyed by a transfer mechanism can be fed back in real time, and the length of the thread which should be pulled out per needle leisurely can be ensured correctly. In addition, since the operation of the cross-direction driving means in addition to the up-and-down driving means can be controlled based on the original thickness of the to-be-sealed object detected by the thickness detecting means, it corresponds exactly to the original thickness of the to-be-sealed material conveyed to the sewing position. Therefore, the drive frequency, the driving amount, the driving speed, and the like of these up-and-down driving means and the cross-direction driving means can be arbitrarily combined, and needle stitches can be formed according to various sewing conditions or sewing patterns.

Claims (3)

A pressing mechanism for pressing the object to be sealed on the needle plate; Having a thread-releasing member disposed along the cloth conveying direction so as to traverse the shanghai path of the needle in a direction intersecting with the conveying direction to wind the needle thread spanned between the needle and the to-be-sealed material and draw the length of the thread with ease; In the sewing machine provided with a thread relaxation mechanism, The thread relaxation mechanism includes: cross-direction driving means for driving the thread relaxation member to cross the shanghai path of the needle in a direction intersecting the cloth transfer direction for every needle stitch; And a control means for controlling the driving frequency or the driving amount of the cross direction driving means. The method of claim 1, The thread relaxation mechanism, Up and down driving means for driving the thread loosening member in the vertical direction, It has a thickness detection means for detecting the thickness of the to-be-sealed material conveyed by the said transfer mechanism, The control means, And a function of controlling the up and down driving means based on the detected thickness of the thickness detecting means. The method of claim 2, And said control means has a function of controlling said cross direction driving means based on the detected value of said thickness detecting means.

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