JP2006181166A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine facilitating an origin search of a pulse motor for adjusting the feed amount of the sewing machine. <P>SOLUTION: A control device 50 is connected with a sewing motor 12 via an input interface not shown in the figure; an encoder 62, or a rotating speed detecting means detecting the rotating speed; a stepping motor 43 setting the feed amount of a feed mechanism 30; an operation pedal 16 adjusting the rotating speed of the sewing motor 12; an operation panel 54 inputting respective types of setting and displaying respective types of information, and a proximity sensor 47b detecting the origin of the stepping motor 43. The control device 50 is provided with an updating command means commanding the updating of the original position of the stepping motor 43. The control device 50 is provided with a temporary original position detecting function and an original position correcting function. The operation panel 54 is provided with a + button and a - button functioning as input means of the correction amount when executing the original position correcting function by the control device 50. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine including a drive source for a feed amount adjustment operation.

The conventional sewing machine has a needle drive mechanism that moves the sewing needle up and down, a feed mechanism that feeds the work piece by letting the feed dog protrude and retract on the upper surface of the needle plate in synchronization with the needle drive mechanism, and a single needle that acts on the feed mechanism. A feed amount adjusting mechanism capable of adjusting the amount of cloth feed per contact, a solenoid for driving a feed amount adjusting operation by the feed amount adjusting mechanism, and an operation control means for controlling the solenoid (for example, Patent Document 1). reference).
JP 2000-51557 A

However, in recent years, a sewing machine that sets an arbitrary feed amount with a pulse motor instead of a solenoid has begun to appear in response to a request for more precise adjustment of the feed amount.
In the sewing machine, the rotational angle position (origin position) of the stepping motor at which the feed amount of the sewing product is 0 is specified, and the sewing product is fed at a desired feed amount according to the rotational drive amount from the origin position. Therefore, it is necessary to perform an origin search for accurately obtaining the origin position of the stepping motor before sewing.
Therefore, it is necessary to attach an origin mark to the output shaft of the stepping motor or a member that moves together with the output shaft, and to provide an origin sensor that can detect the origin mark when the stepping motor is at the origin position. .
However, due to causes such as assembly errors of the sewing machine, there is a case in which the relative positional relationship is not such that the origin mark is detected by the origin sensor when the feed amount becomes zero. In that case, the arrangement of the origin mark or the origin sensor is adjusted, and reassembly work is required so as to obtain a desired positional relationship, and the adjustment work becomes very complicated.

  An object of the present invention is to provide a sewing machine that can easily search for the origin of a pulse motor that adjusts the feed amount of the sewing machine.

  In order to solve the above-mentioned problems, a first aspect of the present invention includes a needle drive mechanism that moves a sewing needle up and down, a feed mechanism that feeds a workpiece by a feed dog in synchronization with the needle drive mechanism, and the feed mechanism. A feed amount adjusting mechanism capable of adjusting the cloth feed amount per stitch by acting on the adjustment mechanism driving means for driving a feed amount adjusting operation by the feed amount adjusting mechanism, and a stepping motor of the adjusting operation driving means. Reference position detection means for detecting that the output shaft is at a certain angular position, operation control means for controlling the drive amount of the stepping motor, and input means for inputting the drive amount of the stepping motor to the operation control means The operation control means includes a temporary origin position detection function for driving and controlling the stepping motor so that the output shaft is at a fixed angular position by the reference position detection means; An origin position correction function that stores a correction amount by a correction input of the input means from a fixed angle position and uses the angular position of the output shaft after the correction input as a new origin in the feed amount adjustment operation; The sewing machine is characterized by

According to the first aspect of the present invention, the stepping motor that is the driving means of the feed adjusting mechanism is driven by the operation control means having a temporary origin position detecting function and an origin position correcting function in response to a correction input operation from the input means. By being controlled, control is performed in which the origin position is corrected without requiring the removal of the sewing machine frame or the operation of detaching each component.
That is, the reference position when driving and controlling the stepping motor is driven and controlled until the output shaft of the stepping motor reaches a certain angular position that can be detected by the reference position detecting means by the temporary origin position detecting function provided in the operation control means. This is recognized by the operation control means. Since the reference position detected by the reference position detection means may include a part processing error or an assembly error, it is set as a temporary origin.
Further, the output shaft of the stepping motor is rotationally driven from the reference position by a correction input from the input means, and the movement amount at that time, that is, the correction amount is stored in the operation control means. In this case, the correction input is performed by observing the operation state of the feed dog while actually driving the feed mechanism, and visually confirming the feed feed amount from the input means so that the feed amount becomes zero by visual confirmation by the operator. Input is made.
By storing the correction amount, the corrected angular position of the output shaft can be called at any time even after the correction. The angle position of the output shaft after the correction input is recognized by the operation control means as a new reference position (origin) by the origin position correction function. Therefore, the subsequent feed amount adjustment operation is executed with the angular position of the output shaft after the correction input as a new origin. Further, when the correction input is performed again after the correction input, the correction amount stored in the operation control means and the correction amount input again are added to obtain a new correction amount. The origin position correction is performed without executing the temporary alignment function.
Then, when the operation reference position of the stepping motor that bears the driving force for changing the feed amount (pitch) is changed (corrected) to a new position, the reference amount of the feed amount adjusting mechanism corresponding to this and the transport amount by the feed dog Becomes a state that can be determined based on an arbitrary amount.

  According to a second aspect of the present invention, in the sewing machine according to the first aspect, the operation control unit includes an update instruction unit that instructs an update of an origin position of the stepping motor, and the operation control unit includes the update instruction. It has a function of executing the temporary origin position detection function and the origin position correction function each time a correction input from the means is received.

  According to the second aspect of the present invention, the origin position of the stepping motor that drives the feed amount adjusting mechanism is detected when the correction input from the update instruction means provided in the operation control means is performed. It is corrected at any time by being controlled to execute the function and the origin position correcting function. That is, even when an error occurs in the feed amount spontaneously due to the use of the sewing machine, it can be arbitrarily corrected each time.

According to the first aspect of the present invention, the origin search of the stepping motor (pulse motor) that drives the feed amount adjusting mechanism is performed from the input means by the operation control means having the provisional origin position detection function and the origin position correction function. It can be executed by an extremely simple operation by simply inputting the correction amount. Therefore, when correcting the origin position of the stepping motor, it is not necessary to tilt the sewing machine frame to expose each mechanism part or to remove parts, etc., and greatly reduce the labor and work time required for origin search. Can do.
Further, since the correction amount at the time of the correction input can be stored by the operation control means, even after the correction input, even if the output shaft is moved from the set position at the time of the correction input due to the influence of the power off or external force. The output shaft can be reproduced at the angular position set at the time of the correction input. Therefore, the time required for the origin search can be shortened.
When correction input is performed again after correction input, the temporary correction amount is stored by adding the correction amount stored in the operation control means and the correction amount input again to obtain a new correction amount. The origin position can be corrected without executing the alignment function. Therefore, the time required for the origin search can be further shortened.
Further, since the correction amount can be set to an arbitrary value, it is possible to perform correction that eliminates the play caused by the dimensional error of the entire apparatus. Therefore, the accuracy of the sewing operation of the sewing machine can be improved.

  According to the second aspect of the present invention, since the operation control means has the update instruction means, when the correction input is made by the update instruction means, the origin position of the stepping motor that performs the feed amount adjustment drive at any time is corrected. be able to. Therefore, the origin search of the stepping motor that drives the feed amount adjusting mechanism can be executed more easily and in a short time. Further, when an error occurs due to the use of the sewing machine, it is possible to arbitrarily correct each time, so that the sewing quality can always be kept high.

(Whole structure of the sewing machine)
Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
As shown in FIG. 1, a sewing machine 1 according to the present embodiment is placed on a sewing machine table T, a bed portion 2a (dashed line) having a needle plate on the upper surface, and a bed above the bed portion 2a. Arm portion 2b extending substantially parallel to the portion 2a, a body portion standing on one end side of the bed portion 2a and supporting one end portion of the arm portion 2b, and a drive for rotating and driving an upper shaft (not shown) A sewing machine motor 12 as means, a needle drive mechanism (not shown) that moves the needle bar 11 and the sewing needle up and down in conjunction with the rotational drive of the upper shaft, and a cloth that is a sewing product placed on the bed portion 2a. A feed mechanism 30 to be fed, a feed amount adjusting mechanism 40 capable of adjusting the cloth feed amount per stitch by acting on the feed mechanism 30, a control device 50 as an operation control means for integrally controlling the operation of the entire sewing machine 1, Set the upper limit and lower limit of the feed amount of the feed mechanism 30. An operation panel 54 as an input means having various switches Utame includes an operation pedal 16 for adjusting the rotational speed of the sewing machine motor 12, the by depression amount.
In the sewing machine 1, a sewing needle attached to the tip of a needle bar 11 is moved up and down by a sewing machine motor 12 to feed the fabric in a predetermined direction by a feed mechanism 30, thereby giving a stitch to the fabric. In addition, a needle plate 13 having an upper surface along a horizontal plane is disposed on the upper portion of the bed portion 2a. In this embodiment, the arm portion 2b of the sewing machine 1 and the bed are parallel to the upper surface of the needle plate 13. The direction along the longitudinal direction of the portion 2a is the Y-axis direction, the direction parallel to the upper surface of the needle plate 13 and perpendicular to the Y-axis direction is the X-axis direction, and the vertical vertical direction is the Z-axis direction. Assumed to be performed.

(Feeding mechanism)
First, the mechanical configuration of the feed mechanism 30 will be described with reference to FIGS. 2 and 3. 2 is a cross-sectional view of the cross section taken along the line II-II in FIG. 1 as viewed from below the bed 2a, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG.
As shown in FIG. 2, a lower shaft 17 is rotatably supported in the bed portion 2a in a state along the Y-axis direction. The lower shaft 17 is connected to the sewing machine motor 12 through a transmission mechanism (not shown) such as a link mechanism or a belt mechanism, and is interlocked with an upper shaft 18 that applies a vertical driving force to the needle bar 11. Rotation drive is performed. When the rotational driving force of the lower shaft 17 is transmitted, the feeding mechanism 30 obtains a driving force for cloth feeding.

  The feed mechanism 30 includes a feed dog 31 that transports the cloth on the upper surface of the needle plate 13 along the X-axis direction, and the lower shaft 17 and the feed dog 31 via an eccentric cam 32 a fixed to one end of the lower shaft 17. Are connected to the lower shaft 17 via an eccentric cam 33a, and the other end of the left and right link 33 is connected to the intermediate portion. The feed amount adjusting link body 34, and a transmission support shaft 35 that connects one end of the feed amount adjusting link body 34 and the feed dog 31 are provided.

  One end of the vertically moving link body 32 is rotatably connected to the feed dog 31, and the other end performs a circumferential motion according to the amount of eccentricity by an eccentric cam 32a. Of the circumferential motion of the vertically moving link body 32, only the reciprocating driving force in the vertical direction is transmitted to the feed dog 31. That is, the feed dog 31 always moves up and down with a displacement equal to the eccentric amount of the eccentric cam 32a when the lower shaft 17 is driven to rotate.

  One end of the left / right link body 33 is rotatably connected to the feed amount adjusting link body 34, and the other end thereof performs a circumferential motion according to the amount of eccentricity by the eccentric cam 33a. Of the circumferential movement of the left and right link body 33, only the reciprocating driving force in the vertical direction is transmitted to the feed amount adjusting link body 34.

  The feed amount adjusting link body 34 is given a reciprocating driving force in the vertical direction from the left and right moving link body 33 at its longitudinal intermediate portion, and one end portion of which is provided at one end portion of the transmission support shaft 35, which will be described later. The tip of each of the two is pivotably connected. Accordingly, the feed amount adjusting link body 34 swings in the vertical direction at the other end portion with the one end portion serving as a swing fulcrum. A square piece 41 of a feed amount adjusting mechanism 40 described later is connected to the other end portion of the feed amount adjusting link body 34.

  The square piece 41 is supported in such a manner that the reciprocating direction of the square piece 41 can be adjusted by inclining on both sides in the X-axis direction with reference to a state parallel to the Z-axis direction. When the square piece 41 is supported so as to be able to move in parallel with the Z-axis direction, the feed amount adjustment link body 34 is not displaced in the X-axis direction. On the other hand, when the reciprocating direction of the square piece 41 is inclined in the X-axis direction, the feed amount adjusting link body 34 is displaced in the X-axis direction. Further, the phase of the swing operation in the X-axis direction of the feed amount adjusting link body 34 is reversed depending on whether the tilt is made to one or the other in the X-axis direction from the state parallel to the Z-axis direction.

The transmission support shaft 35 includes a shaft portion 35a disposed along the Y-axis direction, and arm portions 35b and 35c provided at one end and the other end of the shaft portion 35a, respectively. Then, the shaft portion 35a serves as a central axis, and the tip portions of both the arm portions 35b and 35c are swung in conjunction with each other.
The distal end portion of one arm portion 35 b is connected to one end portion of the feed amount adjusting link body 34, and the distal end portion of the other arm portion 35 c is connected to the feed dog 31. Therefore, as described above, when the feed amount adjusting link body 34 swings along the X-axis direction in accordance with the adjustment of the reciprocating direction of the square piece 41, the feed dog 31 has an X in reverse phase. An axial driving force is applied. Then, the reciprocating movement operation along the X-axis direction is performed through the feed amount adjusting link body 34 and the transmission support shaft 35 with a phase corresponding to the reciprocating direction of the square piece 41.

  With the above configuration, the feed mechanism 30 causes the ellipse motion to be performed by applying the rotational driving force of the lower shaft 17 to the feed dog 31 in combination with the reciprocating motion in the X-axis direction and the Z-axis direction. At this time, the feed dog 31 is disposed below the needle plate 13, and the tip of the feed dog 31 is provided on the needle plate 13 when moving a part of the locus drawn by the elliptical motion. The fabric protrudes from the through hole to the upper surface, and the fabric can be fed in the forward direction (left direction in FIG. 3) and in the reverse direction (right direction in FIG. 3) according to the phase of the movement in the X-axis direction. Further, according to the reciprocating direction of the square piece 41, the feed amount can be adjusted and the feed amount can be set to zero.

(Feed adjustment mechanism)
Next, the feed amount adjusting mechanism 40 will be described in detail with reference to FIGS. FIG. 4 is a configuration diagram showing a peripheral configuration of a stepping motor 43 which will be described later, which is a drive source of the feed amount adjusting mechanism 40.
The feed amount adjusting mechanism 40 supports the square piece 41 connected to the other end of the above-described feed amount adjustment link body 34, supports the square piece 41 so as to be able to reciprocate, and sets the reciprocating direction in the XZ plane. A square piece support 42 that can be variably adjusted in any direction along it, and a stepping motor 43 serving as an adjustment operation drive means serving as a drive source for variably adjusting the reciprocating direction of the square piece 41 by the square piece support 42. A main link body 44 that is swung by the output shaft of the stepping motor 43, a driven link body 45 that is fixedly supported by the square piece support body 42, and a transmission link that connects the main link body 44 and the driven link body 45. A body 46 and reference position detecting means 47 are provided.

The square piece support 42 is formed in a columnar shape and is rotatable on the basis of the center line, and is supported by a sewing machine frame (not shown). And the guide groove 42a which supports the square piece 41 is formed along the cylindrical diameter direction. That is, the square piece support 42 can variably adjust the reciprocating direction of the square piece 41 by being subjected to a rotation operation. When the square piece 41 reciprocates along the Z-axis direction, the feed amount of the feed dog 31 is set to zero.
The follower link body 45 is fixedly installed along the diameter direction of the square piece support 42 at one end in the center line direction of the square piece support 42.

  On the other hand, one end of the main link 44 is fixedly supported on the output shaft in a state along the rotational drive radial direction of the stepping motor 43, and the other end of the main link 45 is connected to the driven link 45 via the transmission link 46. It is connected with one end. As a result, the rotational driving force of the stepping motor 43 rotates the square piece support 42 via the driven link body 45. That is, the square piece 41 defines the feed amount of the feed dog 31 according to the driving amount (rotational angle change amount) of the stepping motor.

The stepping motor 43 transmits the driving force via the main link body 44 connected to the output shaft, the driven link body 45, and the transmission link body 46 that connects both of them, so that the square piece support body 42 is moved. The center line can be rotated as a reference.
Further, the stepping motor 43 is rotatable in the forward direction or the reverse direction by the amount of rotation corresponding to the number of pulse signals based on the number of pulse signals that are commands from the control device 50 provided as an operation control means described later. It has become.
When the stepping motor 43 is driven and controlled by the control device 50 described later, it is necessary to determine an angular position that serves as a reference for rotational driving. In this embodiment, the reference position of the stepping motor 43 is detected by detecting whether or not the swing end portion of the main link body 44 fixed to the output shaft swings at a predetermined position by reference position detection means 47 described later. The position (temporary origin position) can be set. In this embodiment, the angular position of the output shaft of the stepping motor 43 that defines the rotation angle of the square piece support 42 so that the square piece 41 reciprocates along the Z-axis direction is the origin of the stepping motor 43. It is set as a position. That is, even when the feed mechanism 30 is driven, the angular position of the output shaft where the feed amount of the fabric by the feed dog 31 becomes 0 becomes the origin position of the stepping motor 43.

  As shown in FIGS. 4 and 6, the reference position detecting means 47 is such that the detected member 47 a fixedly mounted on the distal end portion of the main link body 44 and the stepping motor 43 are at the reference position (temporary origin position) described above. A proximity sensor 47b that recognizes the presence of the detected member 47a. The output of the proximity sensor 47b is input to the control circuit 50 described later.

(Sewing machine control system)
Next, the control system of the sewing machine 1 will be described with reference to FIG. FIG. 5 is a block diagram showing a control system of the sewing machine 1.
The control device 50 is provided as an operation control means for integrally controlling the operation of the entire sewing machine 1 in the present embodiment. As shown in FIG. 5, a processing program or a process for executing each process described later of the sewing machine 1 is performed. A ROM 52 in which data is written, a CPU 51 that executes the above-described processes according to a processing program, and a RAM 53 that stores various processing data of the CPU 51 are provided. The RAM 53 is provided with various work memories and counters, and is also used as a work area for processing.

The control device 50 includes a sewing motor 12 via an input interface (not shown), an encoder 62 as a rotation speed detecting means for detecting the rotation speed, a stepping motor 43 for performing a feed amount setting operation of the feed mechanism 30, and a sewing machine motor. An operation pedal 16 that adjusts the number of rotations of 12, an operation panel 54 that inputs various settings and displays various information, and a proximity sensor 47 b that detects the origin of the stepping motor 43 are connected.
The control device 50 according to the present embodiment includes an update instruction unit that instructs to update the origin position of the stepping motor 43.

  The operation pedal 16 outputs a signal corresponding to the amount of depression, and the CPU 51 of the control device 50 rotationally drives the sewing machine motor 12 at a rotation speed corresponding to the signal output. The sewing machine motor 12 is connected to the control device 50 through its power supply output circuit, and the rotational speed is controlled by controlling the drive current value.

The operation panel 54 displays various input buttons including a feed amount setting button, and displays a sewing state, various setting information, and an operation instruction for a sewing machine user as necessary.
Here, normally, in this sewing machine, sewing is performed based on the feed amount set by the operation panel 54. At the start of sewing or during sewing, the CPU 51 drives the stepping motor 43 to set the square piece support 42 in a predetermined manner. The feed amount is set to the set feed amount by rotating by an angle.
The operation panel 54 includes a + button and a − button that function as correction amount input means when an origin position correction function is executed by the control device 50 described later.

(Stepping motor home position detection control in the controller)
Next, the origin position detection control of the stepping motor 43 in the control device 50 will be described.
The CPU 51 implements the following functions by executing various programs stored in the ROM 52.
(1) Temporary origin position detection function of stepping motor 43 (2) Origin position correction function of stepping motor 43

  First, the temporary origin position detection function (1) will be described. In the temporary origin position detection, when the CPU 51 executes a predetermined control program to rotate the stepping motor 43 and the detected member 47a is detected by the proximity sensor 47b in the middle, the rotation of the output shaft at that time is detected. The angular position is recognized as a temporary origin position that becomes a reference position when the stepping motor 43 is driven and controlled, and a process of storing in the RAM 53 is performed.

Next, the origin position correcting function (2) will be described. The origin position correction is executed based on an input operation from the operation panel 54 by the sewing machine user. This origin position correction is an origin position correction that is an update instruction means for correcting the origin position from the input unit on the operation panel after the provisional origin position detection process described above by the CPU 51 executing a predetermined control program. After recognizing that the mode switching button has been pressed, the “+/−” button for instructing the rotation of the stepping motor 43 in the forward direction or the reverse direction by the user under the driving condition of the sewing machine motor 12. Each time is pressed, a pulse signal is output to control the stepping motor 43 to rotate in the forward or reverse direction. Further, the CPU 51 performs a process of storing the current angular position of the stepping motor 43 as the origin when the determination key on the operation panel 54 is pressed. The origin position is stored in a non-volatile memory (not shown) provided in the control device 50.
Specifically, after the detection of the temporary origin position is completed, the sewing machine user places the cloth on the needle plate of the sewing machine, steps on the operation pedal 16, and actually tries to convey the cloth. The fabric is not conveyed in the forward direction or the reverse direction by the feeding operation of the feeding mechanism 30 accompanying the drive of the sewing machine motor 12, that is, the rotation angle position of the stepping motor 43 at which the actual feeding amount becomes 0 is set as a new reference. Position, that is, when the input signal of the decision button to update as the corrected origin position is detected, the correction amount from the temporary origin position described above to the corrected origin position (that is, from the operation panel by the user) The number of input signals) is stored, and on the operation panel 54, the corrected origin position is displayed as a position where the feed amount is 0, and the subsequent sewing operation is performed.

(Explanation of sewing machine operation based on main control in the control unit)
The operation of the sewing machine 1 based on the main control in the control device described above will be described based on the flowchart of FIG.
First, when the CPU 51 recognizes the input of the main power supply of the sewing machine 1 (step S1), it is determined whether or not the “origin position correction mode” for correcting the origin position of the stepping motor 43 is performed (step S2). Here, when it is not the origin position correction mode (step S2; No), control for shifting to a normal sewing operation is performed. On the other hand, when an instruction to shift to the origin correction mode is input (step S2; Yes), a temporary origin position detection process is executed. Here, as described above, control is performed to detect the temporary origin position, which is the reference position when driving the stepping motor 43. That is, by executing a predetermined control program, the stepping motor 43 is rotationally driven within a predetermined angular range, and when the detected member 47a is detected by the proximity sensor 47b in the middle, the rotation angle of the output shaft at that time The position is recognized as a temporary origin position that becomes a reference position when the stepping motor 43 is driven and controlled, and a process of storing in the RAM 53 is performed.

  Next, an input signal waiting determination is made as to whether or not a depression signal of the operation pedal 16 is detected (step S3). When a signal indicating that the operation pedal 16 has been depressed is detected (step S3; Yes), the sewing machine motor 12 is rotationally driven at a rotation speed corresponding to the depression amount (step S4). If no depression is detected, the state of waiting for input is continued (step S3; No).

Next, the origin position correction process is executed by the CPU 51. Here, control is performed to determine whether or not a signal indicating that the origin position of the stepping motor 43 has been determined has been input (step S5). When the determination button is pressed and an input signal is detected (step S5; Yes), the rotational angle position of the output shaft of the stepping motor 43 at this time is recognized by the CPU 51 as a new corrected origin position. The operation mode is shifted to the normal operation mode (step S6). In step S5, when an input signal indicating that the origin position is determined is not detected (step S5; No), the stepping motor 43 is driven to rotate in a direction in which the feed amount in the feed direction (X direction) is increased. It is determined whether or not a signal indicating control is input (step S8). When a signal to increase the feed amount is detected (step S8; Yes), a signal for increasing the feed amount by one pulse is output from the CPU 51, and the output shaft of the stepping motor 43 is driven to rotate by one pulse. (Step S9), it is determined whether or not the angular position is set as the origin (Step S5). If an input signal for increasing the feed amount is not detected (step S8; No), it is determined whether an input signal for decreasing the feed amount is detected (step S10). When a signal for reducing the feed amount is detected (step S10; Yes), the CPU 51 outputs a signal for reducing the feed amount by one pulse, and the stepping motor 43 decreases the feed amount in response to this. The rotation drive is controlled by one pulse (step S9), and the process proceeds to the determination of whether or not a signal for determining the origin position is input (step S5). Further, in the origin correction mode, when neither a signal to increase the feed amount nor a signal to decrease is input (step S10; No), whether or not a signal to determine the origin position is input again. A determination is made (step S5).
Whether or not to determine the origin position in step S5 is controlled so as to be repeated, and is arbitrarily determined according to the number of inputs from the operation panel 54 by the sewing machine user.

When an input signal for determining the origin position is detected (step S5; Yes), from the above-described temporary origin position, which is the operation reference position when driving the stepping motor 43, to the corrected origin position. (That is, a subtraction amount after the sum of input signals in the direction of increasing and decreasing the feed amount by the user) is stored in the RAM 53 as a correction amount, and the determined stepping motor 43 is processed. The angle position of the output shaft is recognized as the origin position in the subsequent sewing operation control, and an indication that the determined state is the origin position (that is, the feed amount is 0) is output on the operation panel. Control is performed.
Then, the origin position correction process of the stepping motor 43 is finished, and the routine proceeds to normal sewing control (step S7).
At the time of sewing, the CPU 51 executes sewing according to a predetermined sewing program. At this time, referring to the sewing pitch data stored in advance in the EEPROM 84, the feed amount is determined from the sewing pitch. That is, the stepping motor 43 is driven with reference to the origin position after the origin correction process so that the read feed amount is obtained, and sewing is performed with an appropriate feed amount.

(Effect of embodiment)
As described above, according to the sewing machine 1 according to the present embodiment, the origin position correction of the stepping motor 43 that drives the feed amount adjusting mechanism 40 by the control device 50 having the provisional origin position detection function and the origin position correction function is as follows. The operation can be performed by an extremely simple operation of inputting the correction amount from the operation panel 54 as an input means. Therefore, when correcting the origin position of the stepping motor 43, it is not necessary to tilt the sewing machine frame to expose each mechanism part or to remove parts, and the labor and time required for the origin position correction are greatly reduced. can do.
Further, since the correction amount at the time of the correction input can be stored by the control device 50, even if the output shaft is moved from the setting position at the time of the correction input after the correction input, due to the influence of the power supply Off or external force. The output shaft can be reproduced at the angular position set at the time of the correction input. Therefore, the time required for the origin search can be shortened.
When correction input is performed again after correction input, the correction amount stored in the control device 50 described above and the correction amount input again are added to obtain a new correction amount. The origin position can be corrected without executing the temporary origin position detection function. Therefore, the time required for the origin position correction can be further shortened.
Further, since the correction amount can be set to an arbitrary value, it is possible to perform correction that eliminates the play caused by the dimensional error of the entire apparatus. Therefore, the accuracy of the sewing operation of the sewing machine can be improved.

  Further, since the control device 50 has a function of recognizing the transition to the origin position correction mode on the operation panel 54 as an update instruction means, when correction input is performed in this origin position correction mode, the stepping motor 43 is always updated. The origin position can be corrected. Therefore, the origin position detection of the stepping motor 43 that drives the feed amount adjusting mechanism can be executed more easily and in a short time. Further, when an error occurs due to the use of the sewing machine, it is possible to arbitrarily correct each time, so that the sewing quality can always be kept high.

In the present embodiment, the operation panel 54 is used as an input unit. However, the operation panel 54 is not necessarily limited thereto, and the CPU 51 can be caused to perform a predetermined control operation when necessary by the sewing machine user. Any configuration having an input unit may be used. For example, the operation may be performed by a touch panel including an input unit and a display unit, buttons or dials having various switch functions.
In addition, in the present embodiment, the origin position correction function is the rotation angle position of the stepping motor 43 at which the actual cloth feed amount becomes 0 in the present embodiment, but is not necessarily limited to this. If a transition operation to the origin correction mode, a correction amount input operation, and a position determination operation are performed by an input operation from the operation panel by the user, any rotation angle position within the movable range is stored as a corrected origin position. It is also possible.
Further, in this embodiment, the reference position detecting means 47 is detected when the detected member 47a fixedly provided at the tip of the main link 43 and the stepping motor 43 are at the reference position (temporary origin position) described above. The proximity sensor 47b that recognizes the presence of the detection member 47a is used. However, the configuration is not necessarily limited to this, and it is possible to detect that the rotation angle position of the output shaft of the stepping motor 43 is constant. Any detection means may be used.
In addition, the detection unit and the detected unit may be arranged opposite to each other. Furthermore, the present invention is not limited to this embodiment, and any position can be used as long as the reference position of the output shaft of the stepping motor 43 can be specified. It may be arranged at a place.
The control device 50 in this embodiment is configured to include an update instruction means for the CPU 51 to recognize an input of an instruction to shift to the origin position correction mode on the operation panel 54. However, the update instruction means starts the sewing operation. Even when the sewing operation is being performed before or during the sewing operation, when the operation panel 54 shifts to the origin position correction mode and a correction input is performed, the origin position of the stepping motor 43 can be corrected at any time. May be.

It is the schematic for demonstrating the whole structure of the sewing machine provided with the feed mechanism which concerns on this Embodiment. It is a perspective view which shows the principal part structure of the sewing machine which concerns on this invention. It is sectional drawing of the XX part of FIG. It is explanatory drawing for demonstrating the structure of the stepping motor vicinity of the feed mechanism disclosed by FIG. It is a block diagram which shows the control system of the sewing machine which is embodiment of this invention. It is a perspective view which shows the feed amount adjustment mechanism which concerns on embodiment of this invention. It is a flowchart based on main control in the control apparatus of the sewing machine which is embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 11 Needle bar 12 Sewing machine motor 13 Needle plate 17 Lower shaft 30 Feed mechanism 31 Feed dog 40 Feed amount adjustment mechanism 43 Stepping motor (adjustment operation drive means)
44 main link body 47 reference position detection means 47a detected member 47b proximity sensor 50 control device (operation control means)
54 Operation panel (input means)
62 Encoder

Claims (2)

A needle drive mechanism that moves the sewing needle up and down;
A feed mechanism that feeds the workpiece by a feed dog in synchronization with the needle drive mechanism;
A feed amount adjusting mechanism that can act on the feed mechanism to adjust the cloth feed amount per stitch;
Adjustment operation drive means for driving a feed amount adjustment operation by the feed amount adjustment mechanism;
A reference position detecting means for detecting that the output shaft of the stepping motor of the adjusting operation driving means is at a certain angular position;
Operation control means for controlling the driving amount of the stepping motor;
Input means for inputting the driving amount of the stepping motor to the operation control means,
The operation control means includes
A temporary origin position detecting function for driving and controlling the stepping motor so that the output shaft is at a constant angular position by the reference position detecting means;
An origin position correction function for storing a correction amount by the correction input of the input means from the fixed angle position, and using the angular position of the output shaft after the correction input as a new origin in the feed amount adjustment operation; A sewing machine characterized by comprising.   The operation control means includes an update instruction means for instructing an update of the origin position of the stepping motor, and the operation control means receives the input of the update instruction means and the temporary origin position detection function and the origin position. The sewing machine according to claim 1, wherein the sewing machine has a function of executing a correction function.

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