JP4655744B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine having a feed control means for moving a cloth holding body by feedback controlling a stepping motor, and in particular, detecting a movement limit position of a sewing range of the cloth holding body based on an encoder signal used for feedback control. It relates to what was made.

  Conventionally, in an automatic pattern sewing machine that sews a series of programmed pattern patterns, a work cloth held by a cloth holder is, for example, a cooperation between a sewing needle and a looper supplement device based on previously stored sewing data. The stitch forming means and the cloth holding body are relatively moved so as to cross the vertical movement path of the sewing needle of the stitch forming means for forming the stitch by the action.

  The cloth holder that moves integrally with the work cloth can be moved on the XY plane by an X motor for controlling movement in the X direction and a Y motor for controlling movement in the Y direction. . In addition, in order to perform the origin setting operation of the cloth holder when the power is turned on, an X-direction origin sensor is provided for the X direction, and a Y-direction origin sensor is provided for the Y direction.

  For example, in the sewing machine movement control device described in Patent Document 1, a sewing machine body is provided on a base, a Y-direction movement mechanism is provided on the front side of the sewing machine, and an X-direction movement mechanism is provided on the Y-direction movement mechanism. Provided. In addition, the work cloth holder is configured to move in the XY plane by a pair of stepping motors via a carriage provided in the X direction moving mechanism, and the sewing range of the X cloth sensor and the work cloth holder can be adjusted. An X position sensor and a Y position sensor for detecting the maximum position in the X direction and the Y direction are provided. A movement path control program that defines a plurality of setting paths for causing the work cloth holder to perform the origin setting operation when the power is turned on is stored in advance in the ROM.

As shown in FIGS. 7B and 7C in Patent Document 1, the operator selects a setting path to be used in advance based on the type of the auxiliary presser used for sewing. First, the position where the work cloth holder is moved to YMAX in the direction indicated by arrow E is detected by the Y position sensor, then moved in the direction indicated by arrow F, and finally moved in the direction indicated by arrow G. The work cloth holder origin setting operation can be executed safely without causing any interference between the sewing needle and the auxiliary presser device.
JP-A-6-210082 (pages 6-8, FIGS. 7 and 8)

  In the movement control device for the sewing machine described in Patent Document 1, when performing the origin setting operation, in order to move the work cloth holder along the detour path without causing the sewing needle and the auxiliary presser device to interfere with each other, Since the X position sensor for detecting the movement position and the Y direction position sensor for detecting the maximum movement position in the Y direction are provided, there are problems such as an increase in the number of parts and an increase in cost.

  The sewing machine according to claim 1 includes feed control means for moving a cloth holding body for holding a work cloth to be sewn in at least two different directions by feedback control based on an encoder signal output from the encoder means. In the sewing machine provided, when the movement preventing member for preventing the movement of the cloth holding body in the direction exceeding the sewing range, respectively, and a predetermined number of the encoder signals are not output from the encoder means during the driving of the stepping motor, And detecting means for detecting that a limit position in the moving direction corresponding to the stepping motor has been reached.

  The cloth holding body that holds the work cloth to be sewn is moved in two different directions by feedback control of the stepping motor using the encoder signal output from the encoder means by the feed control means. However, when the movement of the cloth holders in the direction beyond the sewing range is blocked by the movement prevention member while each stepping motor is being driven, the cloth holder cannot move, so the stepping motor cannot rotate and the predetermined number of When the encoder signal is not output from the corresponding encoder, the detection means detects that the limit position in the moving direction corresponding to the stepping motor has been reached.

  In the sewing machine according to claim 2, the cloth holding body that holds the work cloth to be sewn is moved in the first direction and the second direction in which the stepping motor intersects by feedback control based on the encoder signal output from the encoder means. In the sewing machine provided with the feed control means, the cloth holding member is provided integrally with the cloth holding member and protrudes within the sewing range of the cloth holding member, and the cloth holding member is prevented from interfering with the cloth holding member and the sewing needle. Origin setting control storage means for presetting and storing a plurality of origin setting control control programs for setting the origin, and movement in the first direction and the second direction exceeding the sewing range of the cloth holder are respectively prevented. The cloth holding body based on the origin setting control control program selected from the plurality of origin setting controls stored in the origin setting control storage means. Detecting means for detecting that a limit position in the moving direction corresponding to the stepping motor has been reached when a predetermined number of encoder signals are not output from the corresponding encoder means during driving of each stepping motor when setting points; It is equipped with.

  The cloth holder for holding the work cloth to be sewn is feedback-controlled by the feed control means using the encoder signal output from the encoder means for the stepping motor based on the control program for the origin setting control selected in advance. Then, the origin is set while avoiding interference between the cloth presser member and the sewing needle that protrude into the sewing range integrally with the cloth holder.

  However, when the movement of the cloth holding body in the first direction and the second direction exceeding the sewing range is blocked by the movement blocking member while driving the stepping motor to set the origin, the cloth holding body cannot move. When the stepping motor cannot rotate and a predetermined number of encoder signals are not output from the corresponding encoder, the detection means detects that the limit position in the movement direction corresponding to the stepping motor has been reached.

  A sewing machine according to a third aspect is the sewing machine according to the first or second aspect, wherein the movement preventing member is constituted by a contact wall portion formed of a part of a sewing machine frame or a contact member provided on the sewing machine side.

  According to the invention of claim 1, the feed control means for moving the cloth holding body for holding the work cloth to be sewn in two different directions by feedback control based on the encoder signal output from the encoder means. The sewing machine provided with the movement prevention member and the detection means detects the movement limit position of the cloth holder in the sewing range when moving the cloth holder in different directions with the area sensor. Therefore, the feedback control can be used effectively and detected at low cost and easily.

  According to the invention of claim 2, the cloth holding body for holding the work cloth to be sewn is moved in the first direction and the second direction intersecting each other by feedback control of the stepping motor based on the encoder signal output from the encoder means. In the sewing machine provided with the feed control means to be moved, the cloth holding member, the origin setting control storage means, the movement preventing member, and the detecting means are provided, so that the cloth holding body is based on the selected origin setting control control program. When the origin is set, the movement limit position in the first direction and the second direction in the sewing range of the cloth holder is not detected by the area sensor, but the feedback control is effectively used, and the cost is low. It can be easily detected.

  According to invention of Claim 3, the said movement prevention member is comprised by the contact wall part which consists of a part of sewing machine frame, or the contact member provided in the sewing machine side. In this case, as the movement preventing member, a part of the sewing machine frame or a contact member provided separately on the sewing machine side can be applied, and the movement preventing member can be reduced in size and cost. Other effects similar to those of the first or second aspect are achieved.

  The automatic pattern sewing machine according to this embodiment uses an X motor and a Y motor for moving the cloth holding frame in the X direction and the Y direction, and feedback control using encoder signals output from the X encoder and Y encoder provided on the X motor and Y motor. When the origin of the cloth holding frame is set while avoiding the protruding cloth presser within the sewing range of the cloth holding frame, the limit position of the movement direction in the sewing range of the cloth holding frame is determined based on the encoder signal. Can be detected.

  The automatic pattern sewing machine M will be described. As shown in FIG. 1, a sewing machine body 2 is disposed on a machine base 1, a needle plate 4 is disposed at a front end portion of the machine base 1, and an operation panel 8 is provided. The head 3 of the sewing machine body 2 is provided with a needle bar drive mechanism that drives the sewing needle 5 up and down. This needle bar drive mechanism is configured to be driven up and down by a sewing machine upper shaft (not shown) that is rotationally driven by a sewing machine motor 6.

  A balance 7 is supported on the arm portion of the sewing machine body 2 so as to be movable up and down. The balance 7 is driven by a balance driving mechanism in synchronization with the rotation of the upper shaft of the sewing machine. Then, the upper thread fed from a thread spool (not shown) is given a thread tension to the upper thread by a thread tension mechanism (not shown), and is passed through the eye of the sewing needle 5 through the balance 7 and the thread guide. .

  Further, a looper catcher (not shown) is arranged below the needle plate 4 arranged below the sewing needle 5, and this looper catcher catches the upper thread loop formed by the vertical movement of the sewing needle 5. A seam is formed with the lower thread.

  First, the Y direction drive mechanism 10 will be described. A pair of support rails 11 extending in the front-rear direction (the Y direction, which corresponds to the second direction) are arranged in parallel at a predetermined interval on the front side of the sewing machine body 2 and on the left and right sides of the machine base 1. Yes. On the upper side of each support rail 11, a Y moving frame 13 provided with a guide rail 12 extending in the left-right direction (X direction, which corresponds to the first direction) on the upper surface is supported and supported so as to be movable in the Y direction. The rack 14 on the rail 11 and the gear 16 fixed to the left and right ends of the rotating shaft 15 on the Y moving frame 13 side are guided and moved in the Y direction.

  By the way, a Y motor 17 is disposed at the front end portion of the support rail 11 and at the center of the support rail 11 in the X direction, and the rack 19 protrudes forward of the gear 18 and the Y moving frame 13 as the Y motor 17 rotates. Then, the Y moving frame 13 is moved in the Y direction, and the cloth holding body 22 is simultaneously fed in the Y direction.

  Next, the X direction drive mechanism 20 will be described. A carriage 21 is supported on the guide rail 12 on the Y moving frame 13 so as to be movable in the X direction, and a cloth holder 22 is detachably mounted on the upper surface thereof by a pair of left and right clamps 23. A work cloth (not shown) is detachably held on the cloth holder 22 while being stretched by a holding frame (not shown) or the like. A cloth presser member 24 for partially holding a part of the work cloth is detachably attached to the cloth holder 22.

  An X motor 25 is disposed on the machine base 1 on the front side of the Y moving frame 13. With the rotation of the X motor 25, the carriage 21 is connected via a gear 26, 27, a spline shaft 28, a gear (not shown) movable along the spline shaft 28, and a rack 29 extending along the front edge of the carriage 21. Is moved in the X direction on the guide rail 12, and at the same time, the cloth holding body 22 is fed in the X direction.

  Here, the X motor 25 and the Y motor 17 are stepping motors, respectively, and the resolution thereof is, for example, 800 pulses.

  As shown in FIGS. 1 and 5, on the guide rail 12, a + X stopper 31 for blocking the movement of the cloth holding body 22 in the + X direction of the rectangular sewing range E at the limit position, and the sewing range E -X stopper 32 that prevents movement in the X direction at the limit position is fixed so that the attachment position can be adjusted in the X direction.

  Further, as shown in FIG. 1, the support rail 11 includes a + Y stopper 33 for preventing the cloth holding body 22 from moving in the + Y direction of the rectangular sewing range E at the limit position, and −Y of the sewing range E. -Y stoppers 34 that prevent movement in the direction at the limit position are fixed so that the attachment positions can be adjusted in the Y direction. Here, these stoppers 31 to 34 correspond to a movement preventing member.

  Next, the control system of the automatic pattern sewing machine M will be described based on the block diagram of FIG. The control device 40 includes an input / output interface 41, a CPU 42, a computer including a ROM 43, a RAM 44, and the like, and drive circuits 46 to 48.

  The input / output interface 41 drives the operation panel 8, the drive circuit 46 for the sewing machine motor 6, the drive circuit 47 for the X motor 25 that drives the X direction drive mechanism 20, and the Y direction drive mechanism 10. A drive circuit 48 for the Y motor 17, an X-direction origin sensor 35 for origin setting provided in the X-direction drive mechanism 20, a Y-direction origin sensor 36 for origin setting provided in the Y-direction drive mechanism 10, etc. Is connected.

  However, these X-direction and Y-direction origin sensors 35 and 36 are each composed of proximity sensors. Therefore, as shown in FIG. 5, an X-side proximity plate (not shown) is provided so as to correspond to the right half portion of the sewing range E. "L" level origin signal is output in the left half sewing area of the sewing range E that does not approach the "X" level, and "H level" origin signal is output in the right half sewing area of the sewing range E that approaches the X-side proximity plate. Is done.

  Further, as shown in FIG. 5, since a Y-side proximity plate (not shown) is provided so as to correspond to most of the sewing range E other than the front end side portion, the Y-direction origin sensor 36 The origin signal of “H level” is output in most of the sewing area in the rear side of the sewing range E approaching the side proximity plate, and “L” is displayed in the sewing region in the small portion on the front end side of the sewing range E not approaching the Y side proximity plate. The “level” origin signal is output.

  Incidentally, an X encoder 25E, which is a rotary encoder, is attached to the drive shaft of the X motor 25. The X encoder 25E is for detecting the actual rotation amount of the X motor 25. The X encoder 25E includes a disk fixed with a drive shaft so as to be rotatable and having slits formed at appropriate intervals in the circumferential direction, and a light emitting unit and a light receiving unit. Having a detector.

  Therefore, in the X encoder 25E, when the light emitted from the light emitting unit passes through the slit of the disk and is detected by the light receiving unit, an encoder signal related to movement in the X direction is output to the input / output interface 41, and the X motor 25 The rotation angle of the drive shaft is detected. A Y encoder 17E, which is a rotary encoder configured similarly to the X encoder 25E, is also attached to the drive shaft of the Y motor 17, and an encoder signal related to movement in the Y direction is also output from the Y encoder 17E to the input / output interface 41. It has become so.

  In this case, the X encoder 25E outputs 800 encoder signals for one rotation of the X motor 25, and the Y encoder 17E similarly outputs 800 encoder signals for one rotation of the Y motor 17. Here, the X encoder 25E and the Y encoder 17E correspond to encoder means.

  The ROM 43 drives and controls various drive mechanisms, and stores a sewing control program for various patterns, a control program for origin setting control unique to the present application described later, and the like. The origin setting control memory 43a of the ROM 43 (which corresponds to the origin setting control storage means) has a plurality of ways (for example, for setting the origin of the cloth holder 22 while avoiding interference between the cloth presser member 24 and the sewing needle 5 (for example, A control program of origin setting control of three types (first to third origin setting control) is preset and stored.

  As shown in FIG. 5, the first origin setting control is an origin setting control for setting the origin while avoiding the cloth presser member 24 extending rightward and protruding into the sewing range E. As shown in FIG. 6, the control is origin setting control for setting the origin while avoiding the presser foot member 24A extending in the left direction and protruding into the sewing range E. The third origin setting control is shown in FIG. 7, origin setting control is performed for setting the origin while avoiding the presser foot member 24 </ b> B extending forward and projecting into the sewing range E.

  The RAM 44 outputs not only a sewing data memory for storing sewing data to be used for sewing but also a command number counter 44a for counting the number of drive pulses for the X and Y motors 25 and 17 and X and Y encoders 25E and 17E. A signal counter 44b that counts the number of encoder signals to be processed, and various memories, pointers, counters, and the like that store the calculation results calculated by the CPU 42 are provided as necessary.

  Next, an origin setting control routine executed by the control device 40 of the automatic pattern sewing machine M will be described based on the flowchart of FIG. However, the symbol Si (i = 11, 12, 13,...) In the figure is each step. Prior to the start of this control, the operator selects one of three origin setting modes (first to third origin setting modes) by using the operation panel 8 for origin setting control. It is assumed that it has been selected beforehand.

  When the automatic pattern sewing machine M is turned on and this control is started, an origin setting mode for performing preset origin setting control is first read (S11). Next, when the read origin setting mode is “first origin setting mode” (S12), origin setting control (see FIG. 4) by the first origin setting mode is executed (S13). finish.

  However, when the read origin setting mode is the “second origin setting mode” (S12), the origin setting control by the second origin setting mode is executed (S14), and this control is terminated. When the read origin setting mode is the “third origin setting mode” (S12), the origin setting control by the third origin setting mode is executed (S15), and this control is finished.

  The origin setting control in the first origin setting mode will be described based on FIG. However, every time the encoder signal output from the X encoder 25E and the Y encoder 17E is received by driving the X motor 25 or the Y motor 17, the control to increment the signal count value e of the signal counter 44b is performed by an interrupt process (not shown). Shall be executed.

  When this control is started, first, the command number count value m of the command number counter 44a that counts the number of drive pulses commanded to the X motor 25 is cleared, and the encoder signal output from the X encoder 25E The signal count value e of the signal counter 44b for counting the number is cleared (S21).

  Next, the X motor 25 is driven by one pulse, the cloth holder 22 is moved to the left by a minute distance (S22), and the command number count value m is incremented by one (S23). At this time, when the difference value obtained by subtracting the signal count value e from the command count value m is smaller than the step-out detection deviation value d (step-out determination threshold value, for example, “6”). (S24: No), since the cloth holding body 22 is not in contact with the + X stopper 31 and the encoder signal is output from the X encoder 25E, S22 to S24 are repeatedly executed.

  However, when the cloth holder 22 contacts the + X stopper 31 and the encoder signal is not output from the X encoder 25E, the difference value obtained by subtracting the signal count value e from the command number count value m becomes large, and step-out detection is detected. If the deviation value d or more is reached (S24: Yes), the X motor 25 is driven by a predetermined number of pulses, and the cloth holder 22 moves to the right by a predetermined distance (S25). That is, the cloth holder 22 is separated from the + X stopper 31. However, at this time, the sensor signal of the X-direction origin sensor 35 is at “H” level.

  Next, the command number count value n for counting the number of drive pulses commanded to the Y motor 17 is cleared, and the signal count value e for counting the number of encoder signals output from the Y encoder 17E is cleared. (S26).

  Next, the Y motor 17 is driven by one pulse, the cloth holder 22 is moved backward by a minute distance (S27), and the command number count value n is incremented by one (S28). At this time, when the difference value obtained by subtracting the signal count value e from the command count value n is smaller than the step-out detection deviation value d (a step-out determination threshold value, for example, “6”). (S29: No), since the cloth holding body 22 is not in contact with the + Y stopper 33 and the encoder signal is output from the Y encoder 17E, S27 to S29 are repeatedly executed.

  However, when the cloth holder 22 contacts the + Y stopper 33 and the encoder signal is not output from the Y encoder 17E, the difference value obtained by subtracting the signal count value e from the command number count value n becomes large, and step-out detection is detected. If the deviation value d or more is reached (S29: Yes), the Y motor 17 is driven by a predetermined number of pulses, and the cloth holder 22 moves forward by a predetermined distance (S30). That is, the cloth holder 22 is separated from the + Y stopper 33.

  However, at this time, the sensor signal of the Y-direction origin sensor 36 is at “H” level. Further, when the Y motor 17 is driven by one pulse and the cloth holding body 22 is moved backward (S31), and the sensor signal of the Y-direction origin sensor 36 is at "H" level (S32: No), S31 ~ S32 are repeatedly executed.

  When the sensor signal of the Y-direction origin sensor 36 becomes “L” level (S32: Yes), the X motor 25 is driven by one pulse, and the cloth holder 22 is moved rightward (S33). When the sensor signal of the X direction origin sensor 35 is at “H” level (S34: No), S33 to S34 are repeatedly executed. When the sensor signal of the X-direction origin sensor 35 becomes “L” level, the sewing needle 5 is located at the origin position G (S34: Yes), so that the origin setting is completed and this control is finished.

  Here, S21 to S23 and S26 to S28 in the origin control control in the first origin setting mode correspond to the feed control means, and S24 and S29 in the origin control control in the first origin setting mode correspond to the detection means.

  Next, the operation of the origin setting control in the first origin setting mode will be described. In this case, the presser foot member 24 extends rightward and protrudes within the sewing range E. As shown in FIG. 5, when the sewing needle 5 is positioned at the position P0 when the power is turned on and the first origin setting mode is selected, first, the cloth holder 22 is driven by the X motor 25. When the cloth holder 22 moves to the left and comes into contact with the + X stopper 31, the sewing needle 5 moves to P1 and is located at a position P2 backed by a predetermined distance.

  Next, when the cloth holding body 22 moves rearward by driving the Y motor 17 and the cloth holding body 22 comes into contact with the + Y stopper 33, the sewing needle 5 moves to P3 and is positioned at a position P4 backed by a predetermined distance. To do. Thereafter, similarly to the normal origin setting control, the cloth holding body 22 is moved rearward by driving the Y motor 17, and the position P5 at which the sensor signal of the Y direction origin sensor 36 is changed from the "H" level to the "L" level. At that time, the backward movement is stopped.

  Finally, when the cloth holding body 22 is moved rightward by driving the X motor 25 and the sensor signal of the X direction origin sensor 35 changes from the “H” level to the “L” level, the sewing needle 5 is moved to the origin. Since it is located at position G, the origin setting is completed.

  Next, since the origin setting control by the second origin setting mode is almost the same as the origin setting control by the first origin setting mode described above, the illustration is omitted and the operation of the origin setting control will be described.

  In this case, as shown in FIG. 6, the cloth presser member 24 </ b> A extends leftward and protrudes into the sewing range E. When the sewing needle 5 is located at the position P0 when the power is turned on and the second origin setting mode is selected, first, the cloth holder 22 is moved to the right by the drive of the X motor 25, and the cloth When the holding body 22 comes into contact with the −X stopper 32, the sewing needle 5 moves to P1 and is located at a position P2 backed by a predetermined distance.

  Next, when the cloth holding body 22 moves rearward by driving the Y motor 17 and the cloth holding body 22 comes into contact with the + Y stopper 33, the sewing needle 5 moves to P3 and is positioned at a position P4 backed by a predetermined distance. To do. Thereafter, similarly to the normal origin setting control, the cloth holding body 22 is moved rearward by driving the Y motor 17, and the position P5 at which the sensor signal of the Y direction origin sensor 36 is changed from the "H" level to the "L" level. At that time, the backward movement is stopped.

  Finally, when the cloth holding body 22 is moved to the left by the driving of the X motor 25 and the sensor signal of the X direction origin sensor 35 is changed from the “H” level to the “L” level, the sewing needle 5 is moved to the origin. Since it is located at position G, the origin setting is completed.

  Next, since the origin setting control by the third origin setting mode is almost the same as the origin setting control by the first origin setting mode described above, the illustration is omitted and the operation of the origin setting control will be described.

  In this case, as shown in FIG. 7, the cloth presser member 24 </ b> B extends forward and projects into the sewing range E. When the sewing needle 5 is located at the position P0 when the power is turned on and the third origin setting mode is selected, first, the cloth holding body 22 is moved backward by driving the Y motor 17 to hold the cloth. When the body 22 comes into contact with the + Y stopper 33, the sewing needle 5 moves to P1 and is located at a position P2 backed by a predetermined distance.

  Thereafter, similarly to the normal origin setting control, when the cloth holding body 22 moves to the right by driving the X motor 25 and the sensor signal of the X direction origin sensor 35 changes from the “H” level to the “L” level. Since the sewing needle 5 is located at the origin position G, the origin setting is completed.

  As described above, when setting the origin of the cloth holding body 22 based on the control program for the origin setting control selected from the plurality of origin setting modes stored in the origin setting control memory 43a, When a predetermined number of encoder signals are not output from the corresponding X encoder 25E or Y encoder 17E during driving of the Y motor 17, it is detected that the limit position in the moving direction corresponding to the X motor 25 or Y motor 17 has been reached. Therefore, when the cloth holder 22 is set to the origin, the movement limit position in the X direction and the Y direction in the sewing range E is not detected by the area sensor, and the feedback control is effectively used, and the cost is low. Moreover, it can be easily detected.

Next, a modified form of the embodiment will be described.
1) A plurality of origin setting control control programs can be appropriately added and stored in the origin setting control memory 43a of the ROM 43 in accordance with the attachment position, shape, and size of the presser member 24.

  2] The step-out detection deviation value d determined in S24 and S29 of the origin setting control in the first origin setting mode depends on the resolution, the magnitude of torque, and the driving speed of the X motor 25 and Y motor 17 to be used. However, it may be changed as appropriate.

  3) Instead of the stoppers 31 to 34 that prevent the cloth holder from moving in the X direction and the Y direction, a part of the machine frame of the automatic pattern sewing machine M may be effectively used as the contact wall portion. .

  4) The present invention is not limited to the origin setting control of the cloth holding body 22 when the power is turned on, and the cloth holding body 22 is moved to the sewing start position after setting the origin, the thread breakage occurring during the sewing, etc. Thus, the present invention can be applied to the case where the cloth holding body 22 is returned to the origin, and the case where the cloth holder 22 is returned to the origin position after the end of sewing.

  5] The present invention is not limited to the embodiment described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes such modifications.

1 is a perspective view of an automatic pattern sewing machine according to an embodiment of the present invention. It is a block diagram of a control system of an automatic pattern sewing machine. It is a flowchart of origin setting control. It is a flowchart of the origin setting control by 1st origin setting mode. It is explanatory drawing which avoids the cloth holding body extended rightward and sets an origin. It is explanatory drawing which makes the origin setting avoiding the cloth holding body extended in the left direction. It is explanatory drawing which makes the origin setting avoiding the cloth holding body extended in the front direction.

Explanation of symbols

M Automatic pattern sewing machine 22 Cloth holder 25E X encoder 17E Y encoder 31 + X stopper 32 -X stopper 33 + Y stopper 34 -Y stopper 40 Controller 43 ROM
43a Origin setting control memory 25 X motor (stepping motor)
17 Y motor (stepping motor)

Claims (3)

In a sewing machine provided with a feed control means for moving a cloth holding body for holding a work cloth to be sewn in at least two different directions by feedback control based on an encoder signal output from the encoder means,
A movement blocking member for blocking movement in each direction exceeding the sewing range of the cloth holder,
Detecting means for detecting that a limit position in the moving direction corresponding to the stepping motor has been reached when a predetermined number of the encoder signals are not output from the encoder means during the driving of the stepping motor. Sewing machine. Sewing machine provided with a feed control means for moving a cloth holding body for holding a work cloth to be sewn in a first direction and a second direction crossing each other by feedback control based on an encoder signal output from the encoder means In
A cloth presser member provided integrally with the cloth holder and projecting into a sewing range of the cloth holder;
Origin setting control storage means for presetting and storing a plurality of origin setting control control programs for setting the origin of the cloth holder while avoiding interference between the cloth presser member and the sewing needle;
A movement preventing member for preventing movement in the first direction and the second direction exceeding the sewing range of the cloth holder,
When setting the origin of the cloth holding body based on the origin setting control control program selected from the plurality of origin setting controls stored in the origin setting control storage means, a predetermined number is set during driving of each stepping motor. Detecting means for detecting that the limit position in the moving direction corresponding to the stepping motor has been reached when the encoder signal is not output from the corresponding encoder means;
A sewing machine characterized by comprising:   The sewing machine according to claim 1, wherein the movement preventing member is a contact wall portion formed of a part of a sewing machine frame or a contact member provided on a sewing machine side.

Images