JP2005198814A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To efficiently perform handling at a halt of a sewing machine in sewing through detection of thread breakage or the like. <P>SOLUTION: The sewing machine is provided with recess parts 2a approachable for an operator on an end part of a table 2 placing a sewing frame 5 thereon. Switch boxes 8 including a siding switch 11 respectively are disposed near the recess parts 2a for providing the sewing frame 5 with a siding command to move to a specified siding position. At the halt of the sewing machine, when the sewing frame 5 is above the recess parts 2a and the operator operates the siding switch 11 to generate the siding command, a Y-drive mechanism 7 is so controlled that the sewing frame 5 moves to the specified siding position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sewing machine having a recess on which a sewing frame can be placed on a table on which a sewing frame is placed, and in particular, when the sewing machine is stopped by detecting thread breakage or the like, the sewing frame is positioned above the recess. The present invention relates to an improvement in the sewing machine that allows the operator to enter by retracting the sewing frame from the recess.

Some conventional sewing machines have a recess into which an operator can enter an end of a table on which a sewing frame is placed. In this type of sewing machine, when the thread breakage is detected during the sewing process and the driving of the sewing frame is stopped, if the sewing frame is positioned above the recess, the sewing frame is retracted therefrom. A method for controlling the sewing machine is disclosed in, for example, Patent Document 1 below. In the method described in Patent Document 1, the sewing frame is automatically retracted from the upper side of the recessed portion of the table at the time of thread breakage, thereby preventing an inconvenience that the operator cannot enter the recessed portion, and repairing the broken thread ( (Threading) The work can be done smoothly. When the sewing process was restarted after the thread was repaired, it was restarted after returning the sewing frame to the position before retracting. In addition, when the sewing machine is a multi-head sewing machine having a plurality of sewing heads, by performing thread trimming on all sewing heads that are not thread-cut before retracting the sewing frame, The yarn was prevented from being unnecessarily drawn out with the withdrawal.
JP 2002-360959 A

  By the way, in the yarn break detection process, there is a case where the yarn break is erroneously detected even though the yarn is not actually broken. In Patent Document 1, even if the thread breakage is detected as a mistake, if the sewing frame is positioned above the concave portion of the table, the sewing frame is automatically retracted, and there are many heads. In the case of a sewing machine, the sewing frame is retracted after the thread head of the sewing head that has not been thread-cut is trimmed. Therefore, if the thread breakage is detected as a mistake, the sewing frame that has been retracted by the restart instruction must be returned to its original position, and then the sewing operation must be resumed. The operation of returning the operation takes extra time and impairs work efficiency. In the multi-head sewing machine, further, the thread trimming in all the sewing heads is automatically performed, so that time is further lost. Therefore, the conventional technique has a disadvantage that the processing at the time of detecting yarn breakage is inefficient. Further, in a multi-head sewing machine, the sewing frame is retracted even if a mistake is detected, so extra thread that is not actually cut (yarn for which a thread breakage error has been detected) is redundant as the sewing frame is retracted. There is a disadvantage that the sewing condition after the restart is lost.

  The present invention has been made in view of the above-described points, and an object of the present invention is to provide a sewing machine that can efficiently perform processing when the sewing machine being sewn is temporarily stopped by detecting thread breakage or the like. .

  The sewing machine according to the present invention is a sewing machine that includes a sewing frame that is movably mounted on a table, and is formed with a recess so as to allow an operator to enter the edge of the table. An operation means for giving a retraction instruction for moving the sewing frame to a predetermined retraction position, and a retraction instruction by the operation means when the sewing frame is positioned above the recess when the sewing machine is stopped. Accordingly, a movement control means for moving the sewing frame to the predetermined retracted position is provided.

  Further, in the sewing machine according to the present invention, it is possible to select whether or not to perform thread trimming in all the sewing heads provided in the sewing machine before the sewing frame is moved to the predetermined retracted position by the operation means. Can be exemplified.

  Furthermore, as the sewing machine according to the present invention, a mode in which the operation means is arranged at a predetermined position near the recess in the table can be exemplified.

  Further, as the sewing machine according to the present invention, the movement control means further includes means for controlling movement for returning the sewing frame moved to the predetermined retracted position to a position before moving, and includes a sewing frame. In returning to the position before the movement, a mode in which the movement can be controlled to return to the sewing position at least one stitch before the position before the movement can be exemplified.

According to the present invention, the operation means for giving a retraction instruction for moving the sewing frame to a predetermined retraction position, and the operation when the sewing frame is positioned above the recess when the sewing machine is stopped. Movement control means for moving the sewing frame to the predetermined retraction position in response to a retraction instruction by the means, so that when the sewing machine is stopped, the sewing frame is positioned above the recess, When the sewing frame is prevented from entering the recess, it is possible to determine whether or not to move the sewing frame to a predetermined retracted position according to the judgment of the operator.
For example, when a thread break is detected during sewing processing and the sewing machine is temporarily stopped, the operator confirms that there is actually a thread break and then performs a retraction instruction operation by the operation means, and the sewing frame Evacuate. On the other hand, when the thread breakage is detected as a mistake, the sewing process is restarted immediately, so that the unnecessary sewing frame retracting operation can be omitted and time is not lost. Further, since the sewing frame can be retracted according to the operator's judgment, the sewing frame can be retracted even if the sewing frame is actually positioned slightly above the recess even if the thread is actually broken. If the operator determines that retraction is not necessary, retraction of the sewing frame can be omitted. Thus, according to the present invention, there is an excellent effect that it is possible to efficiently perform processing when the sewing machine being sewn is temporarily stopped by detecting thread breakage or the like.

  Further, according to the present invention, since it is possible to select whether or not to perform thread trimming by the operation means, the thread trimming can be performed only by the operation means before the sewing frame is retracted. In addition, since it is possible to determine whether or not to perform thread trimming according to the judgment of the operator, work efficiency is improved. For example, in a multi-head sewing machine equipped with a plurality of sewing heads, when thread breakage is detected, a series of operations for retracting the sewing frame after performing thread trimming on all sewing heads that have not thread breakage is only retraction means. If the amount of retraction movement of the sewing frame is small, the sewing frame can be retreated without performing thread trimming according to the judgment of the operator.

  Further, by arranging the operating means at a predetermined position near the recess in the table, the operator can check a series of thread breakage, sewing frame retraction instruction, threading operation, sewing machine redrive instruction, etc. The work can be performed on the spot without greatly moving the standing position or the work posture, and the convenience of the work is further improved.

  Further, according to the present invention, the movement control means can perform movement control so that the sewing frame moved to the predetermined retracted position is returned to a sewing position at least one stitch before the position before the movement. It becomes possible. If the sewing frame is withdrawn after all the sewing head threads have been cut off, the sewing position will return to the previous sewing stop position when the sewing is resumed after returning to the previous sewing position (sewing stop position). Although inconveniences such as the seam jumping from the start position may occur, according to the present invention, such an inconvenience is caused by returning the sewing frame to a sewing position at least one stitch before the position before retraction. Can be avoided.

  Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In this embodiment, the present invention is applied to a multi-head embroidery sewing machine. In the following description, for the convenience of description, the left-right direction with respect to the sewing machine is referred to as the X direction, and the front-rear direction is referred to as the Y direction.

  FIG. 1 is a plan view of the multi-head embroidery sewing machine according to this embodiment as viewed from above. In FIG. 1, reference numeral 1 denotes a sewing machine frame of the embroidery sewing machine, and reference numeral 2 denotes a table. A plurality (ten in this example) of sewing heads 3 are arranged on the upper arm of the sewing machine frame 1 along the X direction. Each sewing head 3 is arranged to extend from the sewing machine frame 1 toward the front side of the sewing machine (the lower side in the drawing). A plurality of (10) pot bases 4 corresponding to each of the sewing heads 3 are installed at positions substantially directly below the table 2 at positions immediately below the respective sewing heads 3. On the upper surface of the table 2 is placed an embroidery frame 5 for spreading and holding an object to be embroidered (cloth fabric or the like). The embroidery frame 5 is connected to an X drive mechanism 6 and a Y drive mechanism 7 disposed below the table, and is driven by the X drive mechanism 6 in the X direction and by the Y drive mechanism 7 in the Y direction. In FIG. 1, a two-dot chain line indicates a movement position of the embroidery frame 5 moved forward along the Y direction. In the embroidery sewing machine having the above-described configuration, as is well known, the needle that is driven up and down in the sewing head 3 and the shuttle that is rotated in the shuttle base 4 cooperate to be stretched and held in the embroidery frame 5. Embroidery is performed on the object to be embroidered.

  The table 2 is formed with two recesses 2a in which the operator can enter at the front edge thereof. Since the depth of the table 2 (Y direction) is relatively large, the distances from the sewing heads 3 and the pot bases 4 arranged near the center of the table 2 to the edge of the table 2 are increased. Therefore, the recessed portion 2a is formed so that the operator can easily perform maintenance work such as replacement of the thread in the sewing head 3 and handling of thread breakage by approaching the sewing head 3 and the pot base 4. The size and number of the recesses 2a may be set as appropriate so that the operator can easily go in and out and can easily access all the sewing heads 3 and the pot base 4.

  Three switch boxes 8 are installed at predetermined locations on the lower surface of the front end portion of the table 2. The three switch boxes 8 are arranged in the vicinity of the recess 2a so that the operator who has entered the recess 2a can easily operate. In this example, as illustrated, each switch box 8 is disposed on the left and right sides of the two recesses 2a and between the recesses 2a.

2 is a front view of the switch box 8 located at the center of the table 2 in FIG. 1 as viewed from the arrow A, and FIG. 3 is a perspective view of FIG. The three switch boxes 8 may have the same configuration, and the configuration will be described by taking the switch box 8 shown in FIGS. 2 and 3 as an example. The switch box 8 includes a start switch 9 for instructing start of the embroidery sewing machine, a stop switch 10 for instructing stop of the embroidery sewing machine, and an instruction to move (retract) the embroidery frame 5 to a predetermined retreat position. A retraction switch 11 used for performing the above is provided. In this embodiment, as will be described in detail later, the retraction switch 11 returns the embroidery frame 5 to the original working position together with the retraction instruction of the embroidery frame 5 and the thread trimming instruction in all the sewing heads 3 and the retraction position. Also used to give instructions. In this embodiment, as will be described in detail later, when the embroidery frame 5 in the retracted position is returned to the original working position, when all the machine heads 3 are thread-trimmed before retracting. The embroidery frame 5 can be controlled to return to the embroidery position one stitch before the original retracted position, and it is devised to avoid inconveniences such as a stitch fly when embroidery is resumed.
Each of the switches 9 to 11 provided in the switch box 8 is constituted by, for example, a push button type switch. In the illustrated example, the start switch 9 and the stop switch 10 are arranged on the front end surface of the switch box 8, and the bottom surface of the switch box 8 The retraction switch 11 is arranged on the front side. In addition, the shape of the switch and the arrangement position of each switch are not limited to the illustrated example.

  FIG. 4 is a block diagram showing the electrical configuration of the controller of the multi-head embroidery sewing machine according to this embodiment. This controller includes a CPU 12, a ROM 13, a RAM 14, and an input / output interface 16, and the devices are connected via a bus 15. As is well known, the CPU 12 executes a program stored in the ROM 13 and controls the operation of the entire controller. The RAM 14 stores various data necessary for embroidery processing, including current position information of the embroidery frame 5 and position information of a retracted position described later. In the example of FIG. 4, as the devices connected to the input / output interface 16, the X drive mechanism 6 and Y drive mechanism 7, the start switch 9, the stop switch 10 and the retraction switch 11, and the needle of the sewing machine head 3 are driven up and down. In addition, a sewing machine main shaft drive mechanism 17 for rotationally driving the hook of the hook base 4, a yarn breakage detecting device 18 for detecting thread breakage in the sewing machine head 3, and each hook A thread cutting device 19 that is built in the base 4 and cuts the upper thread and the lower thread in the pot base 4 is included.

  In the embroidery sewing machine having the above-described configuration, an example of various controls when performing embroidery processing will be described. When the start switch 9 is pressed by the operator to start the embroidery sewing machine, the sewing machine spindle driving mechanism 17 is driven, and the needle of the sewing machine head 3 is driven up and down by the driving of the sewing machine spindle driving mechanism 17. At the same time, the hook of the pot base 4 is driven to rotate. In synchronization with this, by controlling the driving of the X drive mechanism 6 and the Y drive mechanism 7 based on the embroidery data, the embroidery frame 5 is driven in the X direction and the Y direction, so that the embroidery processing according to the embroidery data is performed. Is done.

  At the time of thread cutting at the time of color change or at the end, the upper thread and the lower thread of all the sewing heads 3 can be cut by operating the thread cutting device 19 provided corresponding to each sewing head 3. When the stop switch 10 is pressed during the embroidery process, the embroidery process is temporarily stopped. When the start switch 9 is pressed when the sewing machine is stopped, the embroidery process is restarted. Further, when the sewing machine is stopped, when the stop switch 10 is pressed, a frame back (stitch back) is performed in which the embroidery parts are returned in order. This frame back is executed while the operator is pressing the stop switch 10. In other words, the operator only needs to keep pressing the stop switch 10 until the next embroidery process resuming position returns to a desired portion.

  When thread breakage occurs during embroidery processing, the thread breakage detection device 18 detects this. When the yarn breakage detection device 18 detects a yarn breakage, the operation of the sewing machine is temporarily stopped accordingly. At this time, the operator may be notified of the location of the sewing head 3 in which the yarn breakage is detected by turning on a display lamp (not shown) provided in each sewing head 3.

When the sewing machine is stopped due to the thread breakage detection or the like, depending on the progress of the embroidery process, for example, when the embroidery frame 5 is stopped above the recess 2a as shown by a two-dot chain line in FIG. There is. Here, the operator can move the embroidery frame 5 to a predetermined retreat position by pushing the retreat switch 11 and retreat from the upper side of the recess 2a. That is, when the retraction switch 11 is pressed, the Y drive mechanism 7 is driven accordingly, and the embroidery frame 5 is moved (retracted) to the rear of the sewing machine along the Y direction. The retracted position of the embroidery frame 5 is not particularly limited as long as it is a position that does not prevent the embroidery frame 5 from coming out of the upper side of the recess 2a and preventing the operator from entering the recess 2a. The retracted position may be set, for example, by setting the mechanical origin of the Y drive mechanism 7 as the retracted position in advance, or may be arbitrarily set by the operator. As a method for the operator to arbitrarily set the retreat position, a setting method by numerical input from an operation panel (not shown), or a method for moving the embroidery frame 5 to an arbitrary position by manual operation and storing the position. There is no particular limitation. Information on the set retreat position is stored in the RAM 14 or the like, and is read when the retreat of the embroidery frame 5 is to be executed.
When the embroidery frame 5 is not positioned above the recess 2a, the embroidery frame 5 may not be retracted even if the retract switch 11 is pressed.

  Further, when instructing the retracting of the embroidery frame 5, when the retracting switch 11 is pressed for a predetermined time or longer (for example, 2 seconds or longer), the thread cutting device 19 provided corresponding to each sewing head 3 is driven. After the threads of all the sewing heads 3 have been cut, the retract control of the embroidery frame 5 is executed. Thereby, it is possible to prevent the thread of the sewing machine head 3 that has not been broken from being unwound with the withdrawal of the embroidery frame 5. When the retract switch 11 is pressed while the embroidery frame 5 is retracted to the retracted position, the Y-axis drive mechanism 7 is driven, and the embroidery frame 5 can be returned to the work position before retracting. Here, in this embodiment, when the embroidery frame 5 is retracted after the threads of all the sewing heads 3 have been cut, the hand is one stitch from the work position before the embroidery frame 5 is retracted. Control shall be made to return to the previous embroidery position.

Next, a processing example when the sewing machine is temporarily stopped by detecting the yarn break will be described with reference to a flowchart shown in FIG. When thread breakage is detected by the thread breakage detection device 18 during embroidery processing, the operation of the sewing machine is temporarily stopped and will be described below in accordance with the operation of the start switch 9, stop switch 10 or retraction switch 11 by the operator. Processing is executed.
First, in step S101, it is checked whether or not the save switch 11 is turned on. If the save switch 11 is not pressed (No in step S101), the process proceeds to step S110. If the retract switch 11 is turned on (Yes in step S101), it is checked in step S102 whether the embroidery frame 5 is in the retracted position. If the embroidery frame 5 is already in the retracted position (Yes in step S102). ), The process proceeds to step S103. If the embroidery frame 5 is not positioned above the recess 2a, the operator does not need to perform the evacuation process of the embroidery frame 5, so step S101 is set to No regardless of whether or not the retraction switch 11 is operated. Processing may be branched to wait for other instruction inputs.

On the other hand, when the embroidery frame 5 is not retracted in step S102, that is, when the embroidery frame 5 is located at the work position when the sewing machine is stopped, this work position is stored as current position information (original position). In step S104, it is checked whether the retraction switch 11 has been pressed for a predetermined time (for example, 2 seconds) or more. If it has not been pressed for more than 2 seconds (No in step S104), the process proceeds to step S105, where the Y drive mechanism 7 is driven based on the above-described retracted position information to retract the embroidery frame 5 to a predetermined retracted position.
If the retraction switch 11 is pressed for 2 seconds or longer (Yes in step S104), the thread cutting device 19 is operated in step S106 to cut all the threads of the sewing head 3, and then the embroidery frame in step S107. 5 is retracted to the retracted position. Thereby, it is possible to prevent the thread of the sewing machine head 3 that has not been broken from being unwound with the withdrawal of the embroidery frame 5. By the processing in step S104, it is possible to select whether or not to perform thread trimming in all the sewing heads 3 before retracting the embroidery frame 5 according to the operation of the retract switch 11.

  In step S103, it is checked whether the threads of all the sewing heads 3 have been cut when the embroidery frame 5 is retracted. When the embroidery frame 5 is retracted after cutting all the threads of the sewing head 3 (Yes in step S103), the embroidery frame 5 is moved based on the stored current position information (original position) in step S108. Return to the position one stitch before the retreat. When the embroidery frame 5 is retracted without cutting the thread (No in step S103), in step 109, before the embroidery frame 5 is retracted based on the stored current position information (original position). Return to position. That is, there are the following reasons for returning the embroidery frame 5 to the position one stitch before the embroidery frame 5 is retracted. That is, the substantial embroidery restart when the sewing machine is restarted starts from the position next to the position where the embroidery frame 5 is returned. For this reason, when the thread is cut before the embroidery frame 5 is retracted, if the thread cutting position is regarded as the current position (original position) and the sewing machine is restarted, the sewing machine starts from the next embroidery position after the cutting position. The embroidery is resumed, and the stitches between the cutting position and the resuming position fly by one stitch. In order to avoid this, when the embroidery frame 5 is retracted after cutting the thread, the embroidery is resumed from the next embroidery position (position before retracting) by returning to the position one needle before the retracting. It is.

  In step S110, it is checked whether or not the stop switch 10 has been pressed. If the stop switch 10 has not been pressed (No in step S110), the process proceeds to step S116. If the stop switch 10 is turned on (Yes in step S110), it is checked in step S111 whether or not the embroidery frame 5 is in the retracted position. If it is not in the retracted position (No in step S111), the embroidery frame 5 is checked. Can be determined to be at the work position (original position) when the sewing machine is stopped, and a well-known “frame back process” can be executed in step S115. In this embodiment, the “frame back process” is performed while the operator continues to press the stop button 10. In step S111, if the embroidery frame 5 is in the retracted position (Yes), it is checked in step S112 whether all the sewing head 3 threads have been cut when the embroidery frame 5 is retracted. . When the embroidery frame 5 is retracted after cutting the thread (Yes in step S112), the embroidery frame 5 is returned to the position one stitch before the retracted embroidery frame 5 in step S113, and then “frame back processing” is performed in step S115. "I do. If the embroidery frame 5 is retracted without cutting the thread (No in step S112), the embroidery frame 5 is returned to the position before retracting in step 114, and "frame back processing" is performed in step S115. .

  In step S116, it is checked whether the start switch 9 has been pressed. If the start switch 9 has not been pressed (No in step S116), the process is returned and the processes in and after step S101 are repeated. If the start switch 9 is turned on (Yes in step S116), it is checked in step S117 whether the embroidery frame 5 is in the retracted position. If it is not in the retracted position (No in step S117), the embroidery frame 5 is It is determined that the sewing machine is at the work position (original position) when the sewing machine is stopped, and embroidery processing is resumed. If the embroidery frame 5 is in the retracted position (Yes in step S117), it is checked in step S118 whether all the sewing head 3 threads have been cut when the embroidery frame 5 is retracted. When the embroidery frame 5 is retracted after cutting the thread (Yes in step S118), the embroidery process is resumed after returning to the position one stitch before the embroidery frame 5 is retracted in step S119. When the embroidery frame 5 is retracted without cutting the thread (No in step S118), the embroidery processing is resumed after the embroidery frame 5 is returned to the position before retracting in step 120.

Next, in this embodiment, an operation performed by an operator when the sewing machine being embroidered is temporarily stopped by detecting thread breakage will be described.
First, the operator confirms whether or not the yarn is actually broken in the sewing machine head 3 in which the yarn break is detected. If the thread is not broken by the sewing head 3 (if thread breakage is detected as an error), the embroidery process may be resumed by turning on the start button 9. On the other hand, if the yarn is actually broken, the repair work is performed as described below. When the sewing machine is stopped and the embroidery frame 5 is positioned above the recess 2a, the operator pushes the retraction switch 11 to retract the embroidery frame 5 to the retraction position. At this time, the embroidery frame 5 can be retracted after performing thread trimming of the sewing head 3 that is not thread-cut by pressing the retract switch 11 for a predetermined time (for example, 2 seconds) or longer. If the amount of retraction movement of the embroidery frame 5 is small and the operator determines that thread trimming is unnecessary, the embroidery frame 5 may be retracted without performing thread trimming without pressing the retraction switch 11 for a long time. Is possible. Then, the operator moves the embroidery frame 5 so as not to get in the way, and then enters the recess 2a to thread the sewing head 3 that has been broken.

After the threading operation with the threaded sewing head 3 is completed, the operator pushes the stop switch 10 to a position before retracting the embroidery frame 5 (one stitch before when the embroidery frame 5 is retracted after cutting the thread). At the same time, the frame is backed by a few stitches, and then the start switch 9 is pressed to resume the embroidery process. This corresponds to the processing performed in the order of steps S110 to S115 in FIG. Note that the frame back at this time is not necessarily required. By pressing the start switch 9 immediately after the threading operation, before the embroidery frame 5 is retracted (one needle before when the embroidery frame 5 is retracted after cutting the thread). The embroidery process can be resumed by returning to the position. This corresponds to the processing performed in the order of steps S116 to S120 in FIG.
In addition, after the threading operation with the machine head 3 in which the thread breakage has been completed, if the operation for returning to the previous position without performing the above-described frame back and / or embroidery processing is performed again, the retraction is performed again. It is only necessary to press the switch 11. This corresponds to the processing performed in the order of steps S101, S102, S103, S108, or S109 in FIG.

  As described above, according to the present embodiment, when the breakage switch 11 for retracting the embroidery frame 5 is provided, when the thread breakage is detected, the operator confirms the actual thread breakage state. Since the evacuation of the embroidery frame 5 can be instructed according to its own judgment, unnecessary evacuation and thread trimming operations of the embroidery frame 5 can be omitted, and the embroidery frame 5 is not actually cut (thread It is no longer necessary to unnecessarily feed out the thread of the sewing head. Further, in the multi-head type sewing machine, when the embroidery frame 5 is retracted after the thread trimming of all the sewing heads 3 that are not thread-cut is performed, only by pressing the retract switch 11 for a predetermined time (for example, 2 seconds) or more. The instruction can be performed, which is advantageous for the operator and is advantageous. Further, since the switch box 8 having a switch group for instructing the retracting of the embroidery frame 5 and the start of the sewing machine operation is provided adjacent to the recess 2a, the operator can confirm the sewing machine head 3 that has broken the thread. Thus, a series of operations from the instruction to retract the embroidery frame 5 and the instruction to resume embroidery processing can be performed on the spot without greatly moving the work position and work posture of facing the sewing machine. Convenient for. In addition, when the embroidery frame 5 is retracted after the threads of all the sewing heads 3 have been cut when the embroidery operation is resumed after the threading operation with the threaded sewing head 3 has been completed, By controlling to return to the embroidery position one stitch before the embroidery position (original position), it is possible to prevent the occurrence of inconveniences such as a stitch skipping when embroidery is resumed.

In this embodiment, the start switch 9, the stop switch 10 and the retraction switch 11 are additionally provided on an operation panel (not shown), etc. It is also possible to further improve the convenience.
Further, there is further provided an appropriate notification means for generating a buzzer warning sound when returning the embroidery frame 5 in the retracted position to the original position, and the operation of the notification means notifies the operator of the execution, In addition, a detecting means for detecting the presence / absence of the worker in the recess 2a is further provided, and a buzzer is sounded when it is detected that the worker is in the recess 2a when the embroidery frame 5 is returned to the original position. Thus, after the worker has left the recess 2a, an operation of returning the embroidery frame 5 to the original position may be executed.
Further, in the above-described embodiment, when the retracted embroidery frame 5 is returned to the original position, it has been described as being returned to the position one needle before the retract when the thread is retracted after being cut. It may be possible to arbitrarily set whether to return to the front of the needle. Further, even when the yarn is retracted without being cut, it may be configured such that several stitches can be returned to the position in front.

The top view which looked at the multi-head type sewing machine concerning one example of this invention from the top. The front view which looked at the switch box with which the sewing machine concerning the example was equipped from the sewing machine front. The perspective view which looked at the switch box shown in FIG. 2 from the downward direction. FIG. 3 is a block diagram showing an electrical hardware configuration of the sewing machine according to the embodiment. The flowchart which shows the process example when the sewing machine is once stopped by the detection of a thread break in the sewing machine which concerns on the Example.

Explanation of symbols

  1 sewing frame, 2 table, 3 sewing head, 4 shuttle base, 5 embroidery frame, 6 X drive mechanism, 7 Y drive mechanism, 8 switch box, 9 start switch, 10 stop switch, 11 retract switch, 12 CPU, 13 ROM , 14 RAM, 15 bus, 16 input / output interface, 17 sewing machine spindle drive mechanism, 18 thread breakage detecting device, 19 thread cutting device

Claims (4)

A sewing machine comprising a sewing frame movably mounted on a table, and having a recess formed on the edge of the table to allow an operator to enter,
Operation means for giving a retraction instruction for moving the sewing frame to a predetermined retraction position;
A movement control means for moving the sewing frame to the predetermined retraction position in response to a retraction instruction by the operation means when the sewing frame is positioned above the recess when the sewing machine is stopped; A sewing machine characterized by comprising.   The sewing machine according to claim 1, wherein the operation means can select whether or not to perform thread trimming in all the sewing heads provided in the sewing machine before moving the sewing frame to the predetermined retracted position.   The sewing machine according to claim 1 or 2, wherein the operating means is disposed at a predetermined position in the vicinity of the recess in the table.   The movement control means further includes means for controlling movement for returning the sewing frame moved to the predetermined retracted position to the position before moving, and for returning the sewing frame to the position before moving. The sewing machine according to any one of claims 1 to 3, wherein movement control is enabled to return the sewing position to at least one stitch before the position before the movement.

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