CN101314892B - electronic sewing machine - Google Patents

Abstract

The electronic sewing machine in the invention comprises a low speed command switch and a control device. The operator only executes on operation to the low speed command switch at the parts of easy to roll up when sewing the fabrics. When the low speed command switch is on, the control device drives the sewing machine motor or sewing machine motor, X-axis drive mechanism and Y-axis drive mechanism at a second speed. The second speed is lower than the first speed of normal sewing; the needle, take-up-lever and shuttle driven by the sewing machine act by the speed lower than the normal sewing. The operator uses pressing piece to press the fabric, thereby continuing the sewing. The invention provides an electronic sewing machine preventing the rolling up of the fabric to improve the quality of the product and not reduce the efficiency of sewing work.

Description

electronic sewing machine

technical field

The present invention relates to an electronic sewing machine which moves a cloth holding frame based on pattern data and sews a pattern on a processed cloth held by the cloth holding frame.

Background technique

An electronic sewing machine includes a needle and a shuttle that operate for sewing, and a cloth holding frame that holds processed cloth. The cloth holding frame moves in the X direction by the rotation of the X-axis drive motor, and moves in the Y direction orthogonal to the X direction by the rotation of the Y-axis drive motor.

A sewing operator using an electronic sewing machine selects a pattern to be sewn, designates a sewing speed in consideration of the type and thickness of the material, and operates a start switch. The control device drives and controls the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor at respective speeds corresponding to the sewing speed designated by the operator. The processing cloth held by the cloth holding frame is moved by the driving of the X-axis driving motor and the Y-axis driving motor. Driven by the sewing machine motor, the needle and shuttle move to sew patterns on the moving cloth.

The pattern sewing sewing machine described in Japanese Laid-Open Patent Publication No. 146478 of 2010 has a cloth pressing plate for pressing a processed cloth against a cloth holding frame. The press plate has punched holes whose shape corresponds to the pattern to be sewn. The operator arranges the decorative cloth pieces in the punched holes of the press plate to sew. The pattern sewing sewing machine sews the outer periphery of the cloth piece configured according to the stitches of the selected pattern to the processed cloth for decoration.

In the conventional pattern sewing machine, the decorative cloth pieces sewn onto the processed cloth are arranged only corresponding to the punched holes of the press plate. Therefore, a part of the cloth sheet is rolled up during sewing, and there is a problem that the quality of a sewn product is lowered due to sewing in the rolled up state.

Rolling up of the cloth piece during sewing can be prevented by the operator pressing the cloth piece arranged in the punched hole from above. However, when the operator presses the piece of cloth being sewn, the moving speed of the cloth holding frame holding the processed cloth needs to be sufficiently slow for the sake of safety, which leads to a problem that the sewing work efficiency is lowered.

Contents of the invention

The purpose of the present invention is to reduce the sewing speed to a low speed and continue sewing during the sewing operation of sewing a pattern at a specified sewing speed, thereby improving the quality of the sewn product by preventing the cloth from being rolled up.

The electronic sewing machine of claim 1 includes: an X-axis drive motor that moves a cloth holding frame that holds a processed cloth in the X direction; a Y-axis drive motor that moves the cloth holding frame in a Y direction that is perpendicular to the X direction; And the sewing machine motor that drives the sewing mechanism, drives the sewing machine motor, the X-axis drive motor and the Y-axis drive motor based on the pattern data of the selected pattern, and at a predetermined sewing speed with the cloth The sewing pattern on the processing cloth that keeps the frame moving integrally includes: a low-speed command switch configured to be operated by a sewing operator, and a control device, when the low-speed command switch is sewing at the sewing speed When turned on midway, the control device drives one of the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor at a second speed lower than a first speed corresponding to the sewing speed. At least the sewing machine motor.

When sewing a portion of the cloth sheet that is likely to be rolled up in a sewing operation of sewing a pattern at a specified sewing speed, the operator turns on the low speed command switch. The control device is activated by turning on the low-speed command switch to drive the sewing machine motor, or the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor at the second speed. The second speed is lower than the first speed corresponding to the designated sewing speed. Therefore, the operator can continue the sewing work in a state where the surrounding area of the sewing position is pressed by the pressing member to prevent the cloth pieces from being rolled up.

In the electronic sewing machine according to claim 2, when the low-speed command switch is turned on during the stop of the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor, the control device uses the first At least the sewing machine motor among the sewing machine motor, the X-axis driving motor and the Y-axis driving motor is driven at two speeds.

When the operator turns on the low-speed command switch in the sewing stop state, the control device drives at least the sewing machine motor among the sewing machine motor, the X-axis driving motor, and the Y-axis driving motor at the second speed. The second speed is lower than the first speed corresponding to the designated sewing speed. Therefore, the operator can reliably start sewing the piece from the easy-to-roll portion.

In the electronic sewing machine according to claim 3, when at least the sewing machine motor among the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor operates at the second speed when the low-speed command switch When the process is interrupted, the control device stops the driving of the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor to interrupt the sewing operation.

When finishing the low-speed sewing, the operator performs an OFF operation on the low-speed command switch. The control device is activated by the OFF operation of the low-speed command switch to stop the driving of the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor, thereby interrupting the sewing operation. When the sewing operation is interrupted, the operator can arrange the sewn pieces and restart sewing smoothly.

In the electronic sewing machine according to claim 4, when at least the sewing machine motor among the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor operates at the second speed when the low-speed command switch When the process is interrupted, the control device drives the sewing machine motor, the X-axis drive motor and the Y-axis drive motor at the first speed, so that the sewing action performed at the sewing speed restart.

When finishing the low-speed sewing, the operator performs an OFF operation on the low-speed command switch. The control device is activated by the off operation of the low-speed command switch, and drives the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor at the first speed. The operator only needs to turn off the low-speed command switch to resume sewing at the specified sewing speed. When the sewing operation is interrupted, the operator can arrange the sewn pieces and resume sewing satisfactorily, thereby improving work efficiency.

Description of drawings

Fig. 1 is a perspective view of the electronic sewing machine of the present invention.

Fig. 2 is a plan view of a cloth holding frame and a cloth presser.

Fig. 3 is a block diagram of the control system of the electronic sewing machine of the present invention.

Fig. 4 is a flow chart of sewing speed control.

Fig. 5 is a flowchart showing a modification mode of sewing speed control.

Detailed ways

The present invention will be described in detail below with reference to the drawings showing preferred embodiments.

As shown in FIG. 1 , an electronic sewing machine 1 includes a workbench 2 as a workbench and a sewing machine body 3 provided on the top of the workbench 2 . The sewing machine body 3 has a bottom plate 4 , a column 5 and a machine arm 6 . The bottom plate 4 is fixed on the workbench 2 . The column 5 is arranged to stand vertically from the rear of the bottom plate 4 . An arm 6 extends parallel to the bottom plate 4 from the upper portion of the column 5 .

A cloth holding frame 15 holding a processing cloth W (see FIG. 2 ) is provided on the front portion of the base plate 4 . The cloth holding frame 15 moves in the X direction (left-right direction) by the drive of the X-axis drive motor 21 (see FIG. 3 ), and moves in the Y direction (front-rear direction) by the drive of the Y-axis drive motor 22 (see FIG. 3 ). .

As shown in FIG. 2 , the cloth holding frame 15 is a plate-shaped frame member having a rectangular planar shape. A cloth presser 16 is attached to an upper portion of the cloth holding frame 15 . The cloth clamp 16 is a rectangular flat plate with a punched hole 16a formed in the center. The rear edge of the cloth pressing plate 16 is combined with the cloth holding frame 15 by means of hinge fittings 17, 17 at two positions. The front edge of the cloth clamping plate 16 is combined with the cloth holding frame 15 by means of hook fittings 18, 18 at two locations.

The cloth clamping plate 16 shown in FIG. 2 has a punching hole 16a in the shape of a "J" in the alphabet. The shape of the punched hole 16a corresponds to the planar shape of the decorative panel AP sewn on the processed cloth W. As shown in FIG. When sewing cloth pieces of other shapes, the operator replaces the cloth press plate 16 with the cloth press plate 16 having punched holes corresponding to the used cloth pieces.

The operator who uses the electronic sewing machine 1 removes the hook fittings 18, 18, rotates the hinge fittings 17, 17 to lift the front part of the cloth clamping plate 16, and as shown in FIG. Arranged on the cloth holding frame 15 . The operator who has placed the processing cloth W lowers the front portion of the cloth press plate 16 and hooks the hook fittings 18 , 18 to clamp and hold the processing cloth W between the cloth holding frame 15 and the cloth press plate 16 . Next, the operator arranges the decorative cloth piece AP to be sewn onto the processing cloth W inside the punched hole 16 a provided in the cloth press plate 16 .

As shown in FIG. 1 , the sewing needle 7 of the electronic sewing machine 1 is mounted on the front end of a needle bar protruding from the lower part of the front end of the machine arm 6 . The sewing needle 7 is driven to reciprocate in the up and down direction by the sewing machine motor 30 . The sewing machine motor 30 is fixed on the lower side of the table 2 . The sewing machine motor 30 also drives a thread take-up lever (not shown) provided inside the machine arm 6 and a shuttle (not shown) provided inside the bottom plate 4 . The thread take-up lever and the shuttle interact with the reciprocating motion of the sewing needle 7 to sew the decorative cloth piece AP to the finished cloth W held on the cloth holding frame 15 . Sewing needle 7, thread take-up lever and shuttle are equivalent to sewing mechanism.

As shown in FIG. 1 , the emergency stop switch 40 is arranged on the front surface of the front end of the arm 6 . The operator operates the emergency stop switch 40 when the sewing operation is stopped urgently.

As shown in FIG. 1 , the operation panel 9 is provided on the upper part of the workbench 2 separated from the sewing machine body 3 , and the control box 10 is arranged on the lower part of the workbench 2 .

The operation panel 9 includes a liquid crystal display portion 9a, numeric keys 9b, and various operation switches 9c. The operator operates the numeric keypad 9b and the operation switch 9c based on the display on the liquid crystal display unit 9a to designate the operating conditions. The designated operating conditions are the selection of the sewing pattern, the designation of the sewing speed, and the like. The sewing speed is determined by the operator according to the type and thickness of the processed cloth W and the decorative cloth AP to be sewn, for example, the operator designates a numerical value by operating the numeric keys 9b.

An operator using the electronic sewing machine 1 completes sewing preparations by holding the work cloth W, arranging the decorative cloth AP, and operating the operation panel 9 as described above.

The control box 10 accommodates a control device 25 for controlling the sewing operation of the electronic sewing machine 1 . The pedal-type start switch 11 and the low-speed command switch 12 are arranged on the floor below the workbench 2 . The start switch 11 and the low speed command switch 12 are connected with the control device 25 inside the control box 10 .

To start sewing, the operator presses and operates the start switch 11 forward. As described below, the control device 25 drives the sewing machine motor 30 , the X-axis drive motor 21 and the Y-axis drive motor 22 by pressing the start switch 11 forward (the start switch 11 is turned on). The driving speeds of the sewing machine motor 30 in this case, the X-axis drive motor 21 and the Y-axis drive motor 22 are the speeds corresponding to the sewing speed specified by the operation of the operation panel 9 (for example, the rotation speed of the sewing machine motor 30 is 2000 rpm/ minute).

When the sewing is completed, the operator depresses and operates the start switch 11 backward. As described below, by depressing the start switch 11 to the rear (the start switch 11 is turned off), the control device 25 stops the sewing machine motor 30, the X-axis drive motor 21 and the Y-axis drive motor 22, and drives the thread cutting device 31 to cut the sewing machine. Upper and lower lines.

The operator depresses and operates the low-speed command switch 12 during sewing or when sewing starts. When the low-speed command switch 12 is depressed (the low-speed command switch 12 is turned on), the control device 25 described below drives the sewing machine motor 30 , the X-axis drive motor 21 and the Y-axis drive motor 22 at low speeds. The driving speeds of the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 in this case are sufficiently lower than the sewing speed specified by the operation of the operation panel 9 (for example, the rotation speed of the sewing machine motor 30 is 200 rev/min). When the operator stops the depression operation of the low speed command switch 12 (takes his foot off the low speed command switch 12 ), the low speed command switch 12 is turned off.

The control system of the electronic sewing machine 1 will be described.

As shown in FIG. 3 , the control device 25 is a computer including a CPU 26 , a ROM 27 and a RAM 28 . The start switch 11 , the low speed command switch 12 , the emergency stop switch 40 and the operation panel 9 are connected to the input side of the control device 25 . A spindle rotation angle detector 29 is also connected to the input side of the control device 25 . The spindle rotation angle detector 29 detects the rotation angle of a sewing machine spindle (not shown) inside the arm 6 . The control device 25 uses the rotation angle detected by the main shaft rotation angle detector 29 as detection values indicating the vertical movement position and the number of vertical movements of the sewing needle 7 .

The drive circuit 32 of the sewing machine motor 30 , the drive circuit 33 of the X-axis drive motor 21 , and the drive circuit 34 of the Y-axis drive motor 22 are connected to the output side of the control device 25 . The drive circuit 35 of the thread cutting device 31 is also connected to the output side of the control device 25 .

The ROM 27 stores pattern data for sewing various patterns, a control program for sewing speed control executed in a sewing operation based on the pattern data, and the like. RAM28 has the area (counter, register, buffer, etc.) which temporarily stores the calculation result of CPU26 during execution of sewing speed control.

The pattern data stored in the ROM 27 is a combination of stitch data (X coordinate value and Y coordinate value) from the first stitch to the last stitch respectively corresponding to selectable patterns.

FIG. 4 is a flowchart showing the operation content of the sewing speed control executed by the control device 25. As shown in FIG. Symbol Si (i=11, 12, 13 . . . ) in FIG. 4 is a step number indicating an operation step of the control device 25 .

The control device 25 starts to operate when the electronic sewing machine 1 is energized. The control device 25 that has started action judges whether there is an on operation of the start switch 11 (S11), and when the start switch 11 is turned off (S11: No), judges whether there is an on operation of the low speed command switch 12 (S11). S16).

The operator turns on the start switch 11 or the low-speed command switch 12 after completing the above-mentioned sewing preparations. When the start switch 11 is turned on (S11: YES), the control device 25 executes a high-speed setting process (S12). When the low-speed switch 12 is turned on (S16: YES), the control device 25 executes low-speed setting processing (S17).

The high-speed setting process is to set the driving speeds of the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 to the first speed (high speed) corresponding to the sewing speed designated by the operator by operating the operation panel 9. deal with. The first speed of the sewing machine motor 30 is, for example, 2000 rpm.

After the high-speed setting process, the control device 25 drives the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at the high speed set in S12, and executes the normal sewing process (S13). In the normal sewing process, the control device 25 calls the vertical movement position of the sewing needle 7 based on the detection angle of the main shaft rotation angle detector 29, and determines whether or not the cloth feeding is possible. When the cloth feeding is possible, the control device 25 reads the stitch data of the next stitch, and drives the X-axis drive motor 21 and the Y-axis drive motor 22 according to the read stitch data. The cloth holding frame 15 and the cloth presser 16 are moved by the driving of the X-axis driving motor 21 and the Y-axis driving motor 22 .

The control device 25 determines whether or not there is next stitch data and whether or not the low-speed command switch 12 has been turned on during the normal sewing process (S14, S15). When there is next stitch data (S14: Yes) and the low-speed command switch 12 is turned off (S15: No), the control device 25 repeatedly executes the normal sewing process of S13. When there is no next sewing data (S14: NO), the control device 25 ends operation. The operator sews the cloth piece AP to the processing cloth W by hemming the outer periphery in a selected pattern. When the operator turns on the start switch 11 but does not turn on the low speed command switch 12 , the sewing speed of the sheet AP becomes the sewing speed (high speed) designated by the operator by operating the operation panel 9 .

When the operator turns on the low-speed command switch 12 while the normal sewing process is being repeated (S15: YES), the control device 25 transfers the process to S17, and executes the low-speed setting process. As described above, when the low speed command switch 12 is turned on before the start switch 11 is turned on (S16: YES), the control device 25 also executes the low speed setting process.

The low-speed setting process is to set the driving speeds of the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 to a second speed (low speed) lower than the first speed corresponding to the sewing speed designated by the operator. deal with. The second speed of the sewing machine motor 30 is, for example, 200 rpm.

After the low-speed setting process is completed, the control device 25 drives the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at the low speed set in S17, and executes the low-speed sewing process (S18). The steps of the low-speed sewing process are the same as those of the normal sewing process in S13, except that the driving speeds of the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 are lower than those corresponding to the above-mentioned sewing speeds.

The control device 25 determines whether the low-speed command switch 12 is on during the low-speed sewing process (S19). When the low-speed command switch 12 is turned on (S19: YES), the control device 25 repeatedly executes the low-speed sewing process of S18. When the operator turns on the low-speed command switch 12 , the sewing speed of the piece AP becomes lower than the sewing speed designated by the operator by operating the operation panel 9 .

When the low-speed command switch 25 is turned off (S19: NO), the control device 25 outputs a command to stop driving to the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 (S20). When the operator turns off the low-speed command switch 12, the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 stop, and the sewing operation temporarily stops.

During the interruption of the sewing operation, the control device 25 sequentially determines whether or not the start switch 11 and the low speed command switch 12 are turned on (S21, S22).

When the start switch 11 is turned on (S21: YES), the control device 25 shifts the processing to S12, and executes high-speed setting processing (S12) and normal sewing processing (S13). The operator can restart high-speed sewing by turning off the low-speed command switch 12 and then turning on the start switch 11 .

When the start switch 11 is turned off and the low-speed command switch 12 is turned on (S21: No, S22: Yes), the control device 25 transfers the process to S17, and performs low-speed setting processing (S17) and low-speed sewing processing (S18). The operator can restart low-speed sewing by turning off the low-speed command switch 12 and then turning on the low-speed command switch 12 again.

When the start switch 11 is off and the low speed command switch 12 is off (S21: No, S22: No), the control device 25 determines whether the thread trimming switch is on (S23). The thread trimmer switch is turned on when the operator depresses and operates the start switch 11 backward.

When the thread cutting switch is turned on (S23: YES), the control device 25 executes the thread cutting process (S24). In the thread cutting process, the control device 25 drives the sewing machine motor 30 , the X-axis drive motor 21 , and the Y-axis drive motor 22 for one stitch, and then drives the thread cutting device 31 . As described above, when the sewing operation is finished, the operator depresses and operates the start switch 11 backward. The control device 25 executes the thread cutting process and advances the processed cloth W and the cloth sheet AP by one stitch, and then the thread cutting device 31 operates to cut the upper thread and the lower thread.

The control device 25 after executing the thread cutting process sequentially determines whether or not the start switch 11 and the emergency stop switch 40 have been turned on (S25, S26). When the start switch 11 or the emergency stop switch 40 is turned on (S25: YES or S26: YES), the control device 25 transfers the process to S36, and executes the origin return process.

The return-to-origin processing is a process of driving the X-axis drive motor 21 and the Y-axis drive motor 22 to reset and move the cloth holding frame 15 and the cloth clamp 16 to predetermined original positions. The operator removes the processing cloth W and the cloth sheet AP from the cloth holding frame 15 and the cloth press plate 16 returned to the original position. After executing the return-to-origin process, the control device 25 shifts the process to S11 and waits until the operator turns on the start switch 11 or the low-speed command switch 12 .

When the start switch 11 and the emergency stop switch 40 are turned off (S25: No, S26: No), the control device 25 determines whether or not the return switch has been turned on (S27). The return switch is one of the operation switches 9 c provided on the operation panel 9 .

When the return switch is turned on (S27: YES), the control device 25 executes the step return process. The step return process is a process of driving the X-axis drive motor 21 and the Y-axis drive motor 22 to return the cloth holding frame 15 and the cloth press plate 16 by one stitch or several stitches.

The control device 25 having executed the step return process sequentially determines whether the start switch 11 , the low-speed command switch 12 , and the emergency stop switch 40 are turned on ( S29 , S30 , S31 ).

When the start switch 11 is turned on (S29: YES), the control device 25 shifts the processing to S12, and executes high-speed setting processing and normal sewing processing. When the low-speed command switch 12 is turned on (S29: No, S30: Yes), the control device 25 shifts the processing to S17, and executes low-speed setting processing and low-speed sewing processing. When the emergency stop switch 40 is turned on (S29: No, S30: No, S31: Yes), the control device 25 transfers the processing to S36, executes the origin return processing, then transfers the processing to S11 and waits until the operator confirms the start The switch 11 or the low-speed command switch 12 is turned on.

When the start switch 11, the low-speed command switch 12 and the emergency stop switch 40 are turned off (S29: No, S30: No, S31: No), the control device 25 determines whether there is a turn-on operation of the return switch and the feed switch. (S32, S34). When the return switch is turned on (S32: YES), the control device 25 executes the return process of the above steps, and returns the cloth holding frame 15 and the cloth press plate 16 (S33).

The feed switch is one of the operation switches 9 c provided on the operation panel 9 . When the cloth holding frame 15 and the cloth presser 16 have returned excessively due to the operation of the return switch, the operator performs an ON operation of the feed switch. When the feed switch is turned on (S34: YES), the control device 25 executes step feed processing (S35). The step feeding process is a process of driving the X-axis drive motor 21 and the Y-axis drive motor 22 to advance the cloth holding frame 15 and the cloth press plate 16 by one stitch or several stitches.

To continue sewing from the front and back of the stop position after the sewing operation is stopped and the thread is trimmed, the operator operates the return switch and the feed switch. The cloth holding frame 15 and the cloth pressing plate 16 holding the processing cloth W and the cloth sheet AP return by an amount corresponding to the number of operations of the return switch and advance by an amount corresponding to the number of operations of the feed switch. The operator moves the processed cloth W and the cloth sheet AP by operating the return switch and the feed switch to determine a sewing restart position. The operator who has determined the restart position operates the start switch 11 or the low-speed command switch 12 to continue high-speed or low-speed sewing.

When suspending the continuation of sewing, the operator operates the emergency stop switch 40 . When the operator operates the emergency stop switch 40, the sewing machine motor 30 stops, and the cloth holding frame 15 and the cloth pressing plate 16 holding the processing cloth W and the cloth piece AP return to predetermined original positions. The operator can remove the processing cloth W and the cloth piece AP that have been reset and moved to the original position.

The procedure of the sewing operation by the electronic sewing machine 1 of the present invention will be described.

As shown in FIG. 2 , when sewing a "J"-shaped piece AP to the processing cloth W, the operator uses a cloth press plate 16 having a punched hole 16a corresponding to the shape of the piece AP. As described above, the operator holds the processing cloth W using the cloth holding frame 15 and the cloth press plate 16, and arranges the cloth piece AP inside the punched hole 16a. The operator who has finished disposing the processed cloth W and the cloth piece AP operates the number keys 9b and the operation switch 9c of the operation panel 9, selects the pattern of the fancy sewing to be performed on the outer periphery of the cloth piece AP and specifies the sewing speed, thereby completing the process. Ready to sew.

The operator who has completed sewing preparations turns on the start switch 11 . As described above, the control device 25 operates to drive the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at high speed. The sewing needle 7, the thread take-up lever and the shuttle are driven by the sewing machine motor 30 to move at high speed, and the processed cloth W and the cloth piece AP are driven by the X-axis drive motor 21 and the Y-axis drive motor 22 to move at high speed according to the stitch data. The operator sews the cloth piece AP to the processing cloth W in such a manner that the outer peripheral portion is decorated with the selected pattern.

For example, the panel AP is sewn clockwise from the start position H0 shown in FIG. 2 , and the sewing position of the panel AP transitions from the horizontal portion APa to the vertical portion APb of the “J”-shaped panel AP.

The lateral portion APa of the sheet AP has a large width and is close to the start position H0. Therefore, the lateral portion APa can be sewn at high speed without any problem. The vertical part APb of the panel AP has a narrow width and is away from the start position H0. Therefore, during high-speed sewing, the vertical portion APb (particularly, the curved portion at the front end) is likely to be rolled up.

The operator who uses the electronic sewing machine 1 of the present invention monitors the progress of sewing, and turns on the low speed command switch 12 when the sewing position advances to the vertical portion APb of the piece AP. As described above, the control device 25 operates to drive the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at a low speed. The sewing needle 7, the thread take-up lever and the shuttle are driven by the sewing machine motor 30 to move at a low speed, and the processed cloth W and the cloth piece AP are driven by the X-axis drive motor 21 and the Y-axis drive motor 22 to move at a low speed. Therefore, the operator can sew the panel AP beautifully by preventing the vertical part APb from being rolled up by pressing the vertical portion APb of the piece AP moving at a low speed, for example, with a rod-shaped pressing member.

The operator who has finished sewing the vertical portion APb performs an OFF operation of the low-speed command switch 12 . As described above, the control device 25 operates, and the electronic sewing machine 1 temporarily stops the sewing operation. When restarting sewing, the operator arranges the pieces AP and performs an ON operation of the start switch 11 or the low speed command switch 12 . When the sewing of the easily rolled up portion is completed, the operator turns on the start switch 11 to sew the piece AP at high speed. When there is still sewing of a portion that is likely to be rolled up, the operator turns on the low-speed command switch 12 to resume sewing the piece AP at a low speed.

The electronic sewing machine 1 of the present invention has a low speed command switch 12 . The operator turns on the low-speed command switch 12 during the normal sewing operation of the high-speed sewing of the panel AP. The control device 25 is activated by turning on the low-speed command switch 12, and drives the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at a speed lower than that during normal sewing. Therefore, the operator can sew the cloth sheet AP moving at a low speed without being rolled up, and the finished sewn product becomes better.

When restarting high-speed normal sewing, the operator turns off the low-speed command switch 12 and turns on the start switch 11 during the low-speed sewing operation. The control device 25 is activated by turning on the start switch 11, and drives the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 at high speed. Therefore, the operator can sew the portion of the cloth sheet AP that is not easily rolled up at high speed, and the overall efficiency of the sewing operation can be improved.

When the operator turns off the low speed command switch 12, the control device 25 temporarily stops the sewing operation. During this stop period, the operator can arrange the shape of the piece AP during sewing, and then resume sewing.

When continuing low-speed sewing after restarting, the operator only needs to turn on the low-speed command switch 12 . The start switch 11 and the low-speed command switch 12 are arranged in a row at positions where the operator's feet can be pressed. Therefore, the operator does not accidentally turn on the start switch 11 and the low-speed command switch 12 at the same time, and can reliably switch between normal sewing and low-speed sewing.

Modifications in which the above-described embodiments are partially modified will be described below.

1) FIG. 5 shows a modified form of the sewing speed control operation of the control device 25. In FIG. 5 , when the operator turns on the low-speed command switch 12 during the repeated execution of the normal sewing process or at the start of sewing (S15: Yes or S16: Yes), the control device 25 also executes the low-speed setting. processing (S17) and low-speed sewing processing (S18). When the low-speed command switch 12 is turned off during low-speed sewing processing (S19: NO), the control device 25 shifts the processing to S12, and executes high-speed setting processing and normal sewing processing (S12, S13).

In the modified form, when the operator turns off the low-speed command switch 12 during the low-speed sewing operation, normal sewing can be restarted without temporarily stopping the sewing operation. Therefore, the overall efficiency of the sewing operation can be further improved.

2) The low-speed command switch 12 may also be a switch arranged under the front end portion of the arm 6 and operated by the operator's hand to be turned on or off.

3) In the above embodiment, the operator inputs both high speed (first speed) and low speed (second speed) as the speeds of sewing machine motor 30, X-axis drive motor 21, and Y-axis drive motor 22. However, either one or both of the high speed and the low speed may be stored in the ROM 27 in advance. The operator only needs to input the speed which is not stored in ROM27.

4) In the above embodiment, the speeds of the sewing machine motor 30, the X-axis drive motor 21, and the Y-axis drive motor 22 are respectively switched to low speeds by the ON operation of the low-speed command switch 12. However, it is also effective to only switch the speed of the sewing machine motor 30 to a low speed.

The reason is as follows: in order to perform sewing, the X-axis drive motor 21 and the Y-axis drive motor 22 must start driving when the sewing needle 7 is separated from the processing cloth W, and stop driving before the sewing needle 7 penetrates the processing cloth W. Even if the driving speed of the sewing machine motor 30 is high, the driving of the X-axis driving motor 21 and the Y-axis driving motor 22 ends before the sewing needle 7 penetrates the processed cloth W. When the speed of the sewing needle 7 is switched from high speed to low speed, the time from when the sewing needle 7 separates from the processing cloth W to piercing the processing cloth W becomes longer. If the speeds of the X-axis drive motor 21 and the Y-axis drive motor 22 are not changed, only the time from the end of the driving of the X-axis drive motor 21 and the Y-axis drive motor 22 to the insertion of the sewing needle into the processed cloth becomes longer. As described above, if the speeds of the X-axis drive motor 21 and the Y-axis drive motor 22 are high, the speed of the sewing machine motor 30 will not be affected. The drive speeds of the X-axis drive motor 21 and the Y-axis drive motor 22 are preferably set in advance to a speed corresponding to the maximum feed amount when the sewing machine motor 30 is at a high speed.

As can be seen from the above detailed description, the electronic sewing machine of the present invention includes a low-speed command switch and a control device. When sewing a portion that is likely to be rolled up on a piece of cloth to be sewn onto a processing cloth during a normal sewing operation, the operator turns on the low-speed command switch. When the low-speed command switch is turned on, the control device drives the sewing machine motor, the X-axis drive motor, and the Y-axis drive motor at a second speed lower than the first speed during normal sewing. The operator can press the processing cloth and the cloth piece moving at a low speed by using a pressing member or the like to carry out sewing. The processing cloth and cloth pieces move at a low speed, and the rolling up of the cloth pieces itself is not easy to happen. Therefore, it is possible to improve the quality of sewn products without occurrence of poor sewing due to rolled-up fabric pieces. The moving speed of the processing cloth and the cloth piece drops only during the period when the operator performs the ON operation of the low speed command switch. Therefore, the reduction in the efficiency of the sewing operation can be suppressed to be small.

Claims (4)

1. electronic sewing machine; Comprise: the X shaft drive motor that makes the cloth that keeps machining cloth keep frame to move, make said cloth keep the Y shaft drive motor that frame moves along the Y direction with the directions X quadrature and drive making the motor of sewing machine of mechanism along directions X; Pattern data based on selected pattern drives said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor; And keeping sewing pattern on the said machining cloth that the frame one moves with said cloth with predetermined sewing speed; It is characterized in that, comprising:

Low speed command switch, this low speed command switch are configured to and can operate by making the operator; And

Control device; Make in the way when having connected when what said low speed command switch was carrying out with said sewing speed, said control device is with than the said at least motor of sewing machine that drives corresponding to the low second speed of first speed of said sewing speed in said motor of sewing machine, said X shaft drive motor and the said Y shaft drive motor.

2. electronic sewing machine as claimed in claim 1; It is characterized in that; When said low speed command switch had been connected in the stopping of said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor, said control device drove the said at least motor of sewing machine in said motor of sewing machine, said X shaft drive motor and the said Y shaft drive motor with said second speed.

3. according to claim 1 or claim 2 electronic sewing machine; It is characterized in that; When the process of moving with said second speed when the said at least motor of sewing machine of said low speed command switch in said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor has broken; Said control device stops the driving of said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor, makes to make the action interruption.

4. according to claim 1 or claim 2 electronic sewing machine; It is characterized in that; When the process of moving with said second speed when the said at least motor of sewing machine of said low speed command switch in said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor has broken; Said control device drives said motor of sewing machine, said X shaft drive motor and said Y shaft drive motor with said first speed, and the action of carrying out with said sewing speed of making is restarted.

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