JP2007209663A - Cloth presser device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stabilize a sewing quality irrelevant to the level of an operator's skill and accurately set a cloth without any time constraints. <P>SOLUTION: This cloth presser device 1 of a sewing machine is provided with a cloth presser 2, a lifting/lowering means 3, an actuation command means 4a commanding the lifting/lowering means to drive the lowering or stop the lowering, and a control means 5, when finishing the sewing, automatically lifting the cloth presser by the lifting/lowering means, when lowering the cloth presser, sequentially lowering the cloth presser by the lifting/lowering means based on the lowering drive command by the drive command means whenever outputting the lowering drive command or a lowering stop command alternately by the drive command means, immediately stopping the lowering of the cloth presser by the lifting/lowering means based on the lowering stop command by the drive command means and, when the cloth presser presses a sewn object, controlling the drive of the lifting/lowering means to invalidate the lowering drive command by the drive command means. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a cloth presser for a sewing machine having a presser for pressing a workpiece to be sewn placed on a sewing machine bed.

2. Description of the Related Art A sewing machine that performs sewing while moving a cloth in an XY direction (a direction along the upper surface of the sewing machine bed) based on sewing data set in advance is known. Such a sewing machine is provided with a cloth presser for pressing a cloth placed on the sewing machine bed from above, and the cloth moves on the sewing bed together with the cloth presser.
Here, the cloth presser for pressing the cloth is provided so as to be movable up and down in the vertical direction of the sewing machine by the cylinder, and presses the cloth by lowering the cloth presser to the sewing product placed on the sewing machine bed. Can do. When the cloth presser is lowered, the fluid pressure of the cylinder as the lifting means can be changed by stepping on the presser lifting / lowering pedal by the operator, and the pressure can be lowered at a speed corresponding to the stepping amount (see, for example, Patent Document 1). ). The cloth presser is lowered by the action of the cylinder when the depression of the operation pedal is released.
JP-A-10-216381

  However, in the conventional cloth presser, since the descending speed is determined by the amount of depression of the presser lifting / lowering pedal by the operator, the adjustment of the descending speed depends on the operation technique of the operator. When pressing the cloth, it is necessary to lower it at a relatively low speed in order to prevent the cloth from shifting, but if the cloth presser descends at different speeds depending on the skill level of the operator, the cloth will shift. There is a problem that the quality of the sewing product is not stable due to a problem that cannot be corrected.

  Accordingly, the present invention has been made to solve the above-described problems, and can stabilize the quality of the sewing product regardless of the skill level of the operator, and can accurately set the cloth without being limited by time. An object of the present invention is to provide a cloth presser device for a sewing machine that can be used.

In order to solve the above problems, the invention according to claim 1 is a cloth presser device for a sewing machine, which is movable on the sewing machine bed so as to be raised or lowered, and is placed on the sewing machine bed at the time of the lowering. A cloth presser that presses the workpiece and moves in the X and Y directions along the upper surface of the sewing bed; and a lifting means that is connected to the cloth presser and that lifts and lowers the cloth presser and applies a pressing force to the sewing product; A drive instruction means for instructing the lowering means to descend or stop, and when sewing is finished, the cloth presser is automatically raised by the lift means, and when the cloth presser is lowered, it is lowered by the drive instruction means. Each time a driving instruction or a descent stop instruction is alternately output, the cloth presser is sequentially lowered by the elevating means based on the descent driving instruction by the driving instructing means, and the driving finger Based on the descent stop instruction by the means, the descent of the cloth presser by the elevating means is immediately stopped, and the descent drive instruction by the drive instructing means is invalidated when the cloth presser presses the workpiece. And a control means for controlling driving.
Here, the XY direction refers to a direction along the upper surface of the sewing machine bed, and means that it can be moved in two directions, the front-rear direction and the left-right direction with respect to the sewing machine.

According to the first aspect of the present invention, the control means automatically raises the cloth presser by the elevating means at the end of sewing, and presses the cloth presser based on the lowering drive instruction by the drive instructing means when the cloth presser is lowered. The lowering means is sequentially lowered by the raising / lowering means, and the lowering of the cloth presser by the raising / lowering means is immediately stopped based on the lowering stop instruction by the drive instruction means, and the lowering drive instruction by the drive instruction means is invalidated when the cloth presser presses the workpiece. The driving of the lifting means is controlled.
As a result, the control means can stop the cloth presser at a position desired by the operator in accordance with an instruction from the drive instruction means, and the control means may be displaced when pressing the workpiece, or a cloth or a plurality of cloths that are difficult to set. When setting the fabrics simultaneously, it is possible to solve the problem that the fabric setting cannot be completed before the fabric presser is lowered.
In addition, since the cloth presser can be stopped immediately based on the descent stop instruction, the cloth presser can be stopped at a position closer to the workpiece, so that the workpiece can be set at a more accurate set position. become. As a result, it is possible to realize a more uniform finish with less unevenness in the sewn product.
Therefore, the quality of the sewing product can be stabilized regardless of the skill level of the operator, and the cloth can be set without being restricted by time. In addition, when the workpiece is set correctly, the cloth presser can be lowered without being stopped halfway to press the workpiece, so that the cycle time can be shortened.

  According to a second aspect of the present invention, in the cloth presser device for a sewing machine according to the first aspect of the present invention, the sewing machine has an operation means for performing a sewing start operation, and the control means is configured to perform the lifting / lowering operation by turning on the drive instruction means. The drive of the means is started, the drive of the elevating means is stopped by turning off the drive instructing means, and the operation of the operating means is validated when the elevating means is at the lowest position.

According to the second aspect of the present invention, the driving of the lifting / lowering means is started by turning on the driving instruction means, and the driving of the lifting / lowering means is stopped by turning off the driving instruction means. Since the operation can be validated, there is no need to newly provide an operation input device for driving the lifting means.
Therefore, the increase in cost can be suppressed without increasing the number of parts. Further, the driving of the lifting / lowering means can be controlled by a simple method of turning on / off the driving instruction means.

  According to a third aspect of the present invention, in the cloth presser device of the sewing machine according to the first or second aspect, the elevating means immediately stops the cloth presser halfway with a cylinder device that raises and lowers the cloth presser by fluid pressure. And a stopper.

  According to the third aspect of the present invention, the cloth presser lifting / lowering means can be realized with a simple configuration of the cylinder device and the stopper.

  According to the first aspect of the present invention, the quality of the sewn product can be stabilized regardless of the skill level of the operator, and the cloth can be set without being restricted by time. In addition, when the workpiece is set correctly, the cloth presser can be lowered without being stopped halfway to press the workpiece, so that the cycle time can be shortened.

  According to the second aspect of the present invention, it is possible to suppress an increase in cost without increasing the number of parts. Further, the driving of the cylinder device can be controlled by a simple method of depressing and releasing the operation pedal.

  According to the third aspect of the present invention, the cloth presser lifting / lowering means can be realized with a simple configuration of the cylinder and the stopper.

The best mode of a cloth presser device for a sewing machine according to the present invention will be described below in detail with reference to the drawings.
<Configuration of cloth presser>
As shown in FIGS. 1 and 2, the cloth presser 1 can be moved up and down along the vertical direction of the sewing machine, and the cloth presser 2 and the cloth presser 2 press the work to be sewn placed on the sewing machine bed. And a cylinder device 3 as an elevating means for raising and lowering the cloth presser 2 by fluid pressure and applying a pressing force to the sewing product, and a presser as a drive instruction means for instructing the cylinder device 3 to drive or stop Based on the drive instruction by the lifting / lowering pedal 4a, the sewing machine starting pedal 4b as an operating means for starting the sewing machine and starting sewing, and the pressing / lowering pedal 4a, the cloth presser 2 can be placed at an arbitrary position in the lifting path of the cloth presser 2. A control device 5 as control means for controlling the drive of the cylinder device 3 so as to be stopped, a cloth feed base 6 provided with the cloth presser 2, the cylinder device 3 and the like, and the cylinder device 3 And a, a cylinder sensor 32a provided in the cylinder unit 3 so as to detect more that the presser foot 2 has descended to the lowest point.

  The cloth presser 2 is movable so as to be raised or lowered on the sewing machine bed. When the cloth presser 2 is lowered, the cloth presser 2 presses the cloth as a sewing object placed on the sewing machine bed and moves in the XY direction along the upper surface of the sewing machine bed. The cloth presser 2 is, for example, a rectangular frame having an opening, and the inside of the four sides is greatly opened. Needle drop is made on the fabric held inside the opening 2a, and sewing is performed. The cloth presser 2 is connected to a lifting mechanism 7 that lifts and lowers the cloth presser 2 by driving the cylinder device 3. The elevating mechanism 7 includes a drive transmission member 71 which is formed to be bent in a substantially square shape, and the bent portion is rotatably attached to the cloth feed base 6. The drive transmission member 71 has one end connected to the cloth presser 2 and the other end connected to the piston rod 31 of the cylinder device 3. Further, the attachment position of the drive transmission member 71 to the cloth feed base 6 is lower than the connection position between the drive transmission member 71 and the cloth presser 2 and the connection position between the drive transmission member 71 and the piston rod 31. It is attached to the cloth feed base 6. With this configuration, when one end of the drive transmission member 71 moves upward due to the reciprocating movement of the piston rod 31, the other end moves downward, and when one end moves downward, the other end moves upward. To do.

  The cylinder device 3 is configured by an air cylinder that uses air as a fluid. Two cylinder devices 3 are provided, each of which is connected to a drive transmission member 71 and attached to the piston rod 31 that advances to the cloth presser 2 side by the depression (on operation) of the presser lifting / lowering pedal 4a and the cloth feed base 6. , A cylinder 32 in which the piston rod 31 is housed, and an electromagnetic valve that is connected to the inside of the cylinder 32 by an air supply pipe 33 and feeds air into the gap between the piston rod 31 and the cylinder 32 inside the cylinder 32 via the air supply pipe 33. 34 and the release of the presser lifting / lowering pedal 4a (off operation) closes the solenoid valve 34 and stops the piston rod 31 at the stepless position (in other words, at the height when the cloth presser 2 lowering stop instruction is output). And a locking mechanism 35 as a stopper that stops immediately. The cylinder sensor 32a is provided on the side of the cylinder 32, and detects that the cloth presser 2 is at the lowest point when the cloth presser 2 is lowered to the lowest point, that is, when the piston rod 31 is extended most. . A detection signal of the cylinder sensor 32 a is transmitted to the control device 5.

The electromagnetic valve 34 is configured so that the amount of air supplied into the cylinder 32 changes according to the depression time of the presser raising / lowering pedal 4a, so that the movement amount of the piston rod 31 can be adjusted. It has become. Specifically, the movement amount of the piston rod 31 is configured to increase as the depression time of the presser lifting / lowering pedal 4a increases.
The lock mechanism 35 immediately stops the driving of the piston rod 31 when the presser lifting / lowering pedal 4a that has been depressed by the operator is released. That is, the cylinder device 3 is configured to prevent the movement of the piston rod 31 due to the inertia after releasing the presser lifting / lowering pedal 4a. Thereby, the piston rod 31 can be stopped steplessly. The solenoid valve 34 is controlled by the control device 5 that has received a signal corresponding to the depression of the presser lifting / lowering pedal 4a.
The lock mechanism 35 may be configured to stop the supply of air into the cylinder 32 by controlling the operation of the electromagnetic valve 34 by the control device 5, and a stopper member that can advance and retreat on the moving path of the piston rod 31. The stopper member may be provided on the moving path of the piston rod 31 to prevent the movement of the piston rod 31 by releasing the holding lift pedal 4a.

  The sewing machine starting pedal 4b is used as an ON / OFF switch for starting or stopping sewing based on sewing data when depressed or released. Further, when the sewing machine starting pedal 4b is depressed, the cloth presser 2 is moved in the X and Y directions and the sewing machine motor is started to move the needle up and down.

As shown in FIG. 2, the control device 5 includes a CPU 51 that executes each process in accordance with a process program related to operation control of the sewing machine, a ROM 52 that stores a process program and process data for executing each process, And a RAM 53 serving as a work area.
The ROM 52 has a function of controlling the driving of the cylinder device 3 so as to stop the cloth presser 2 at an arbitrary position on the lift path of the cloth presser 2 based on the operation (drive instruction or stop instruction) of the presser lift pedal 4a. A control program 52a to be realized is stored. That is, when the CPU 51 executes the control program 52a, the control device 5 functions as a control unit.

Specifically, when the CPU 51 executes the control program 52a, the control device 5 causes the cylinder device 3 to start raising / lowering the cloth presser 2 almost simultaneously with the depression (operation start) of the presser lifting / lowering pedal 4a, The raising / lowering of the cloth presser 2 is stopped almost simultaneously with the release (deactivation) of the pedal 4a (immediately after the release of the depression). Thereby, the cloth presser 2 can be stopped at an arbitrary position.
That is, the control program 52a automatically raises the cloth presser 2 by the cylinder device 3 at the end of sewing, and when the cloth presser 2 is lowered, a lowering drive instruction or a lowering stop instruction by the presser lifting / lowering pedal 4a is alternately output. Each time, the cloth presser 2 is sequentially lowered by the cylinder device 3 based on the lowering drive instruction by the presser raising / lowering pedal 4a, and the lowering of the cloth presser 2 by the cylinder device 3 is immediately stopped based on the lowering stop instruction by the presser raising / lowering pedal 4a, When the cloth presser 2 presses the cloth, the drive of the cylinder device 3 is controlled so as to invalidate the lowering drive instruction by the presser lifting / lowering pedal 4a.
Further, the control program 52a starts driving of the cylinder device 3 by turning on the presser raising / lowering pedal 4a, stops driving of the cylinder device 3 by turning off the presser raising / lowering pedal 4a, and lowers the cylinder 32 of the cylinder device 3 downward. Sometimes, the operation of the sewing machine starting pedal 4b is validated.

<Operation control of cylinder device>
Next, operation control of the cylinder device 3 will be described.
As shown in FIG. 3, the CPU 51 determines whether or not the sewing for forming the seam on the workpiece is completed while the sewing machine moves the cloth presser 2 in the XY directions according to the sewing data (step S <b> 1). If the CPU 51 determines that the sewing has been completed, the CPU 51 drives the cylinder device 3 so that the cloth presser 2 automatically moves to the highest position (step S2). Then, the operator depresses the presser lifting / lowering pedal 4a after replacing the sewing object.
Then, the CPU 51 determines whether or not the pressing / lowering pedal 4a is turned on, that is, whether or not the pressing / lowering pedal 4a is depressed (step S3). Here, when the CPU 51 determines that the presser raising / lowering pedal 4a has been depressed (step S3: YES), the CPU 51 executes the control program 52a, whereby air is introduced into the cylinder 32 from the electromagnetic valve 34 through the air supply pipe 33. To start the lowering drive of the cloth presser 2 (step S4).

  Next, the CPU 51 determines whether or not the pressing / lowering pedal 4a is turned off, that is, whether or not the pressing of the pressing / lowering pedal 4a is released (step S5). When the operator presses the cloth presser 2 down to the position just above the sewing product, when the operator wants to stop the work to correct the position of the sewing product, or the operator presses the cloth presser 2 down to the lowest position where the sewing product is pressed. When releasing the lifting pedal 4a. At this time, when the lowering position is lowered to the lowest position, the workpiece is pressed and the cylinder sensor 32a is turned on to disable the pressing operation of the lifting / lowering pedal 4a and stop the lowering drive. Here, when the CPU 51 determines that the depression of the presser lifting / lowering pedal 4a has been released (step S5: YES), the CPU 51 executes the control program 52a to close the electromagnetic valve 34 and drive the lock mechanism 35. The driving of the piston rod 31 is immediately stopped (step S6). On the other hand, when the CPU 51 determines that the depression of the presser lifting / lowering pedal 4a is not released (step S5: NO), the CPU 51 continues the lowering drive of the cloth presser 2 in step S4.

On the other hand, when the cloth presser 2 stops the lowering drive (step S6), the CPU 51 determines whether the cylinder sensor 32a is on or off (step S7). When it is determined that the cylinder sensor 32a is off and the cloth presser 2 is not lowered to the lowest position (step S7: NO), the process returns to step S3. When the CPU 51 determines that the operator has again turned on the pressing / lowering pedal 4a (step S3: YES), the CPU 51 drives the piston rod 31 again to lower the cloth presser 2 again.
If it is determined in step S7 that the cylinder sensor 32a is on and the cloth presser 2 is lowered to the lowest position (step S7: YES), the CPU 51 determines whether or not the operator has turned on the sewing machine starting pedal 4b. Is determined (step S8). If the CPU 51 determines that the sewing machine starting pedal 4b is turned on (step S8: YES), the CPU 51 starts the sewing machine motor and performs sewing (step S9). On the other hand, when the CPU 51 determines that the sewing machine starting pedal 4b is not turned on (step S8: NO), the CPU 51 determines whether or not the pressing / lifting pedal 4a is turned on (step S10). . Here, when the CPU 51 determines that the presser lifting / lowering pedal 4a is turned on again (step S10: YES), the CPU 51 drives the piston rod 31 to move the cloth presser 2 upward to the highest position ( In step S11), the cloth presser 2 is lowered by the lowering operation of the cloth presser 2 (steps S3 to S7). On the other hand, when the CPU 51 determines that the presser raising / lowering pedal 4a is not turned on (step S10: NO), the CPU 51 returns to the determination of step S8.

<Effect>
According to the cloth presser device 1 of the embodiment, when the operator starts the operation of the presser lifting / lowering pedal 4a, the CPU 51 executes the control program 52a, thereby causing the cylinder device 3 to almost simultaneously start the operation of the presser lifting / lowering pedal 4a. The lowering of the cloth presser 2 is started. When the operator stops the operation of the presser lifting / lowering pedal 4a, the CPU 51 executes the control program 52a to cause the cylinder device 3 to stop the lowering of the cloth presser 2 almost simultaneously with the stop of the operation of the presser lifting / lowering pedal 4a. .
As a result, the control device 5 holds the cylinder device 3 depending on whether or not the presser lifting / lowering pedal 4a is being operated regardless of whether the presser / lowerer pedal 4a is operated or not. The operation can be controlled.
Further, since the cloth presser 2 can be stopped at an arbitrary position, the cloth presser 2 can be stopped at a position closer to the sewing product, and the sewing product can be set at a more accurate set position. become. As a result, it is possible to realize a more uniform finish with less unevenness in the sewn product.
Therefore, the quality of the sewing product can be stabilized regardless of the skill level of the operator, and the cloth can be set without being restricted by time.
Further, after the cloth presser 2 is lowered to the lowest position and presses the cloth, when the press position of the cloth presser 2 against the cloth is shifted, the cloth presser 2 is raised again before starting the sewing. The lowering operation of the cloth presser 2 can be repeated again.

  The present invention is not limited to the above embodiment. For example, the lifting means is not limited to an air cylinder that uses air as a fluid, but may be a hydraulic cylinder or an electromagnetic solenoid that uses oil. In addition, an instruction to drive or stop the cylinder device is not limited to that by the operation pedal, but may be given by a program stored in the ROM in advance. Moreover, you may use the elastic force of a spring as a raising / lowering means when raising a cloth presser. When descending, the descending control can be performed by driving the air cylinder against the elastic force of the spring. In addition, substitution, change, and the like can be freely made within the scope of the invention.

The external appearance perspective view which shows the outline | summary of the cloth pressing device of a sewing machine. The block diagram which shows the structure of the cloth pressing device of a sewing machine. The flowchart explaining operation | movement of the cloth presser of a sewing machine.

Explanation of symbols

1 Cloth presser 2 Cloth presser 3 Cylinder device (lifting means)
4a Pressing lift pedal (drive instruction means)
4b Sewing machine starting pedal (operating means)
5 Control device (control means)
35 Locking mechanism (stopper)

Claims (3)

A cloth presser that is movable so as to be raised or lowered on the sewing bed, and that moves in the X and Y directions along the upper surface of the sewing bed while pressing the sewing object placed on the sewing bed when the lowering,
Elevating means connected to the cloth presser and raising and lowering the cloth presser and applying a pressing force to the sewing product;
Drive instructing means for instructing the elevating means to descend or stop.
At the end of sewing, the cloth presser is automatically raised by the lifting and lowering means, and when the cloth presser is lowered, the drive instruction means is output each time a lowering drive instruction or a lowering stop instruction is alternately output by the drive instruction means. The cloth presser is sequentially lowered by the lifting and lowering means based on the lowering drive instruction by the lifting and lowering means, and the lowering of the cloth presser by the lifting and lowering means is immediately stopped based on the lowering and stopping instruction by the driving instruction means. Control means for controlling the driving of the elevating means so as to invalidate the descending drive instruction by the drive instructing means when pressed;
A cloth presser device for a sewing machine comprising: Having an operation means for performing a sewing start operation;
The control means starts driving of the lifting / lowering means by turning on the driving instruction means, stops driving of the lifting / lowering means by turning off the driving instruction means, and when the raising / lowering means is at its lowest position, 2. The sewing machine cloth presser according to claim 1, wherein the operation is made effective. The lifting means is
A cylinder device that raises and lowers the cloth presser by fluid pressure;
A stopper for immediately stopping the cloth presser halfway;
The cloth presser device for a sewing machine according to claim 1 or 2, further comprising:

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