JP2005218753A - Holing sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid intervention of continuous driving of a scalpel while letting the scalpel make appropriate vertical motions, and to avoid tearing of a fabric and cutting of ground yarn. <P>SOLUTION: The holing sewing machine 10 comprises a needle driving mechanism 30 for moving a sewing needle 11 in the vertical direction, a presser mechanism 40 synchronizing the vertical motions of the sewing needle for moving/positioning a fabric, a scalpel mechanism 70 for boring a hole on the fabric held by the presser mechanism by the vertical motions of the scalpel 71, and a motion control means 100 for controlling the vertical motions of the scalpel. The motion control means controls driving of the scalpel mechanism according to the set driving time for the vertical motions of the scalpel and controls the motions to increase/decrease the driving speed of the needle driving mechanism according to the length of the set driving time of the vertical motions of the scalpel. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a boring machine having a knife mechanism for making a hole in a fabric.

A conventional boring machine has a needle drive mechanism that moves the sewing needle up and down, a cloth presser mechanism that holds the cloth on the needle plate and performs positioning of the cloth, and a vertical movement of the knife with respect to the cloth held by the cloth presser mechanism. And a knife mechanism that cuts to make a hole by moving, and in synchronization with the vertical movement of the sewing needle, the cloth is sequentially moved to a predetermined position by the cloth presser mechanism to perform sewing. Holes are formed in the fabric by performing the lowering and raising operations of the knife once (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 11-9860 (FIG. 1)

In a sewing machine equipped with a female needle drive mechanism, such as the above-described boring machine, an air cylinder is often used as a drive source for the vertical movement. However, in the case of an air cylinder, for example, when the entire sewing machine is cooled to the outside air without being used for a long time, the air pressure is lowered and raised before the knife is sufficiently lowered. Opening) could cause defects.
Further, when cutting thick fabrics or hard fabrics, cutting failures such as the knife not being able to sufficiently penetrate the fabric or the knife being unable to come out after penetration may occur.
In order to avoid these cutting defects, in the conventional boring machine, the driving time of the air cylinder in the descent operation and the up operation of the knife in the initial stage after turning on the power or in accordance with the type of fabric is longer than usual. A method was adopted in which the length was set long, thereby increasing the reliability of operation and the cutting force.

However, in the above method, the reciprocating vertical movement time of the knife is increased, so that there is a disadvantage that the next cutting operation is not performed in time and a cutting operation error occurs.
Furthermore, due to the increase in the reciprocating vertical movement time of the knife, the cloth is moved to the next sewing position in a state where the knife is pierced by the cloth, resulting in inconvenience that the cloth is damaged or the yarn is cut. there were.
An object of the present invention is to perform stable cutting of a fabric in a hole sewing.

  According to the first aspect of the present invention, the needle driving mechanism that moves the sewing needle up and down by the sewing machine driving means, the cloth pressing mechanism that moves and positions the cloth in synchronization with the vertical movement of the sewing needle, and the cloth pressing mechanism are held by the cloth pressing mechanism. A boring machine comprising a scalpel mechanism for perforating a cloth by a vertical movement of the scalpel and an operation control means for controlling the vertical movement of the scalpel, wherein the operation control means controls the vertical movement of the scalpel. A configuration is adopted in which drive control of the knife mechanism is performed according to the set drive time to be performed, and operation control is performed to increase or decrease the drive speed of the sewing machine drive means according to the length of the set drive time of the vertical movement of the knife.

In the above configuration, the sewing operation is performed by dropping the sewing needle to a predetermined position on the cloth by the cooperation of the needle driving mechanism and the cloth pressing mechanism. Then, in the middle of the sewing operation, when the fabric is at a predetermined position, the knife mechanism is driven to drop the knife on the fabric, and the hole cutting operation is executed.
The operation control means, when executing the cutting operation by the knife mechanism at the initial stage of power input to the sewing machine, or when performing the cutting operation on the thick or hard cloth, the descent and ascending drive time of the knife in advance. Is set longer than the knife drive time during normal sewing.
The normal sewing here refers to a case where a cloth having a predetermined thickness or hardness is sewn. In addition, setting the knife driving time longer means that the driving source applies a driving force for the vertical movement to the knife longer.
Thereby, at the time of cutting, a sufficient drive period is ensured when the knife is lowered and raised, and the knife lowering operation and the returning raising operation to a predetermined position are more reliably performed.
At this time, the operation control means executes operation control for reducing the driving speeds of the needle driving mechanism and the cloth pressing mechanism in accordance with an increase in the cutting driving time. As a result, the time until the next knife lowering can be secured, and the fabric feed and the yarn can be prevented from being cut by slowing the cloth feed.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the operation control means has a sewing machine in accordance with the length of each vertical movement when the vertical movement of the knife is performed a plurality of times. It has a function to increase / decrease the drive speed of the drive means, and compares the drive speed of the sewing machine drive means based on the vertical movement interval of the knife with the drive speed of the sewing machine drive means based on the set drive time of the vertical movement of the knife. Thus, the sewing machine driving means is controlled based on the slower driving speed.

In the above configuration, when the vertical movement of the knife is performed at least twice, control is performed to reduce the drive speed of the sewing machine driving means when the vertical movement of each knife is close. As a result, the time required for the vertical movement of the first knife is ensured by the start timing of the next knife vertical movement.
The “interval between the vertical movements of the knife” here refers to the time interval when the timing means is provided and the timing of the vertical movement of the knife is controlled by the measurement time, and the number of drive operations (number of rotations) of the sewing machine driving means. ) And the vertical movement of the sewing needle are used to control the timing of the vertical movement of the knife.
Further, as described above, the present invention performs control to increase / decrease the driving speed of the sewing machine driving means according to the set driving time of the vertical movement of the knife. By adopting the slower one of the drive speed and the drive speed of the sewing machine drive means based on the set drive time of the vertical movement of the knife, both measures are taken.

The invention described in claim 3 has the same configuration as that of the invention described in claim 1 or 2, and the operation control means performs at least the first vertical movement of the knife after power-on in a drive time longer than that during normal sewing. The configuration is such that the operation control to be driven is performed.
The above "at least first time" is intended to target the first knife drive, but if multiple times of knife drive are performed, the range is less than the scheduled number of times of knife drive. You may drive for a long time about the frequency | count of 2 or more from the beginning.

  The normal sewing here refers to a case where a cloth having a predetermined thickness or hardness is sewn. In addition, driving with a long driving time means that the driving source applies a driving force for vertical movement to the knife longer. The drive time is set and inputted in advance as a drive time longer than a general drive time, and the operation control means may perform a process of selecting the set input value, or a predetermined drive time may be set for the normal drive time. You may perform the process calculated by multiplying with a coefficient.

  In the above configuration, since the motion control means drives the knife up and down at least for the first time after turning on the sewing machine for a longer time than other normal sewing, the air cylinder is used as the vertical drive source of the knife mechanism. Even when using something that may cause insufficient driving force at the initial stage, it is possible to spread the fluid that performs sufficient power transmission everywhere and ensure sufficient driving force from the time of power-on. Can do.

The invention described in claim 4 has the same configuration as that of the invention described in claim 3, and further includes an input means for inputting the drive time of at least the first movement of the female knife after the power is turned on to the operation control means. Is adopted.
In the above configuration, at least the first vertical movement of the knife can be input to the operation control means via the input means, and the operation control means can perform at least the first vertical movement of the knife based on the input. Do. Thereby, the vertical movement of the knife can be adjusted and set at an arbitrary time longer than the normal sewing.

The invention described in claim 5 has the same configuration as that of the invention described in claim 3 or 4, and the operation control means performs the vertical movement of the knife that is driven in a drive time longer than that during normal sewing after turning on the power. The number of times from the first time can be set.
In the above configuration, the number of times the knife is driven for a long time after the power is turned on is set, and the operation control means repeats the knife for a long time according to the set number of times, and when the knife driving for the set number of times is finished. Thereafter, the knife drive is performed in a normal drive time.

Since the invention according to claim 1 includes operation control means for performing operation control for increasing / decreasing the driving speed of the sewing machine driving means in accordance with the set driving time of the vertical movement of the knife, driving of the vertical movement of the knife Even if the time is set long and the cutting force and the reciprocating driving force are sufficiently secured, the needle driving mechanism and the cloth presser mechanism can be correspondingly slowed down. It is possible to secure time and to prevent fabric breakage and ground yarn cutting by slowing the cloth feed.
That is, according to the present invention, it is possible to perform a continuous cutting operation, and further, it is possible to avoid the breakage of the fabric and the cutting of the yarn while improving the reliability of the cutting operation and the returning operation by the knife, and the stable cutting operation. Can be performed.

According to the second aspect of the present invention, by performing control to increase / decrease the driving speed of the sewing machine driving means according to the length of the vertical movement of the knife, even if the knife driving is continued, there is no delay to the next knife driving. Each knife drive can be performed accurately and reliably, and the sewing quality can be improved.
Furthermore, by adopting the slower one of the driving speed of the sewing machine driving means based on the interval of each vertical movement of the knife and the driving speed of the sewing machine driving means based on the set driving time of the vertical movement of the knife, it is possible to cope with both. The effect of the invention according to claim 1 can be ensured while having the effect of reliably performing the continuous knife drive.

According to the third aspect of the present invention, since the operation control means moves up and down in a drive time longer than that at the time of normal sewing at least when the knife is driven for the first time after turning on the power, an air cylinder is used as the vertical drive source of the knife mechanism. Even when using something that may cause insufficient driving force at the initial stage, it is possible to spread the fluid to transmit power everywhere, and even at the initial stage from power on, sufficient disconnection Driving force can be ensured. For this reason, it becomes possible to cut the fabric stably and more reliably from the initial power-on stage.
Further, even in the case where extension driving is performed with respect to such an initial stage knife driving, the needle driving mechanism and the cloth presser mechanism can be slowed according to the extension time, so that the above effects are achieved. Thus, it is possible to avoid interference with the next knife drive, and to avoid breakage of the fabric and cutting of the ground yarn.

  According to the fourth aspect of the present invention, since the input means for setting and inputting at least the drive time of the first vertical knife movement is provided, the vertical movement of the knife can be adjusted and set to an arbitrary time longer than the normal sewing. For this reason, it is possible to adjust the driving time to an appropriate driving time for at least the first knife drive, and it is possible to perform the vertical movement of the knife at the initial stage of driving more sufficiently and reliably.

  According to the fifth aspect of the present invention, the long-time driving of the knife after the power is turned on can be adjusted to an appropriate number of times, and the knife driving can be performed sufficiently and reliably by being repeated as appropriate.

(Overall configuration of the embodiment)
A buttonhole sewing machine 10 according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an external perspective view of a hole sewing machine 10 according to this embodiment, and FIG. 2 is a schematic perspective view showing the internal structure of the hole sewing machine 10.
As shown in FIG. 1, the perforated sewing machine 10 includes a sewing machine frame 2 whose outer shape is substantially U-shaped in a side view. The sewing machine frame 2 includes a sewing machine arm portion 2 a that extends in the front-rear direction and forms an upper portion of the boring machine 10, a sewing bed portion 2 b that extends in the front-rear direction, forms a lower portion of the boring sewing machine 1, and the sewing machine arm portion 2 a and the sewing bed portion And a vertical body 2c that connects 2b.
In the following description, the extending direction of the sewing machine bed 2b is defined as the Y-axis direction, the direction orthogonal to the Y-axis direction and horizontal in the use state of the boring machine 10 is defined as the X-axis direction, and the boring machine 10 The direction perpendicular to the usage state is defined as the Z-axis direction.

(Mechanical structure of the hole sewing machine)
As shown in FIGS. 1 and 2, the boring machine 10 includes a needle drive mechanism 30 that drives the sewing needle 11 up and down, and the sewing needle 11 along the X-axis direction in synchronization with the vertical movement of the sewing needle 11. A needle swinging mechanism 20 that swings the needle, a cloth presser mechanism 40 that moves and positions the cloth along the Y-axis direction in synchronization with the vertical movement of the sewing needle 11 on the upper surface of the sewing machine bed 2b, and the sewing machine bed 2b. The hook mechanism 60 provided in the inside, the knife mechanism 70 which forms a button hole in cloth, and the operation control means 100 which performs operation control of said each structure are provided.

(Needle drive mechanism)
The needle drive mechanism 30 includes an upper shaft 31 that is rotatably supported in the sewing machine arm portion 2a in a state along the Y-axis direction, and a sewing machine motor 32 that is connected to one end of the upper shaft 31 and serves as a sewing machine drive unit. And a crank mechanism 33 provided at the other end of the upper shaft 31, and a needle bar 34 to which the vertical driving force is transmitted by the crank mechanism 33 at the tip of the sewing machine arm 2a.
The needle bar 34 holds the sewing needle 11 at its lower end. On the other hand, the needle bar 34 is supported by a needle bar support 21 of a needle swinging mechanism 20 described later so as to be reciprocally movable along the longitudinal direction of the needle bar 34. Further, the needle bar support 21 is The upper end portion of the sewing machine frame 2 is supported by the sewing machine frame 2 so as to be swingable about the axis center along the Y-axis direction. For this reason, the needle bar 34 can reciprocate substantially along the vertical direction (substantially Z-axis direction) and can swing its lower end portion having the sewing needle 11 along the X-axis direction. ing.

The crank mechanism 33 is composed of a rotary weight provided on one end side of the upper shaft 31, a crank shaft that connects the position eccentric from the rotation center of the rotary weight and the needle bar 34, and is driven by the rotational drive of the upper shaft 31. Only the driving force for reciprocating up and down movement is transmitted to the needle bar 34.
Then, the needle drive mechanism 30 drives the sewing needle 11 to move up and down at the same cycle as the output rotation speed of the sewing machine motor 32 with the above configuration.

(Needle swing mechanism)
The needle swinging mechanism 20 includes a needle bar support 21 that supports the needle bar 34 so that the needle bar 34 can move up and down, and has an upper end supported by the sewing machine frame 2 so as to be swingable about the axis along the Y-axis direction. A rocking shaft 22 to which a reciprocating rocking driving force is applied from a shaft 31 by a known transmission mechanism, and a rocking arm 23 whose base end is fixedly supported by one end of the rocking shaft 22 are provided.
The swing shaft 22 is supported by the sewing machine frame 2 in a state parallel to the Y-axis direction, and the swing arm 23 is connected to the needle bar support 21 at the swing end. Accordingly, the swing driving force of the swing shaft 22 is transmitted to the needle bar support 21 via the swing arm 23, and as a result, the sewing needle 11 is swung along the X-axis direction via the needle bar 34. It is possible.
Further, the transmission mechanism that swings the swing shaft 22 transmits the reciprocating swing at a frequency that is half the rotational speed of the upper shaft 31. As a result, the sewing needle 11 that moves up and down at the same frequency as the upper shaft 31 can be dropped in the forward and backward paths of the reciprocating swing of the needle bar 34.

  Further, the transmission mechanism can adjust the swing center position and swing angle range of the needle bar 34 by a known mechanical element configuration. The adjustment of the swing center position and the swing angle range is performed according to the operation amounts of the X feed motor 24 and the swing width adjustment motor 25 (see FIG. 4), which are pulse motors, respectively. The operation amount is controlled by the operation control means 100. That is, by controlling the driving amounts of the motors 24 and 25, the sewing needle 11 can be dropped at an arbitrary position in the X-axis direction with respect to the fabric.

(Cloth holding mechanism)
As shown in FIG. 2, the cloth presser mechanism 40 has a cloth holding plate 41 slidably disposed along the upper surface of the sewing machine bed 2b and a cloth placed on the cloth holding plate 41. A cloth presser frame 42 that is clamped from above, a support arm 43 that supports the cloth presser frame 42 so as to be movable up and down, and a press-up solenoid that switches the cloth presser frame 42 between a pressed state and a released state by moving up and down via the support arm 43. 44 (see FIG. 4), a support body 45 that supports the rear end portion of the support arm 43 and the rear end portion of the cloth holding plate 41, and a drive source for moving the support body 45 along the Y-axis direction. A Y-feed motor 46 composed of a stepping motor, and a drive transmission shaft 47 formed in a rack that meshes with a pinion gear provided on the output shaft of the Y-feed motor 46 and driven along the Y-axis direction. That.

The cloth presser frame 42 is a rectangular frame, and the inner side of the cloth presser frame 42 penetrates vertically, and buttonhole sewing is performed in the inner region of the frame. That is, the sewing needle 11 is arranged to move up and down inside the cloth presser frame 42. Similarly, a knife 71 (to be described later) of the knife mechanism 70 is also arranged to move up and down inside the cloth presser frame 42. Further, the cloth presser frame 42 can be exchanged for a plurality of types of different sizes in the front-rear direction. In other words, by using a larger cloth presser frame 42, it corresponds to hole sewing when the button hole is large.
Further, since the cloth is held between the cloth holding frame 42 and the cloth holding plate 41, a through hole through which the sewing needle 11 and the knife 71 are inserted downward is formed in the cloth holding plate 41.

  Further, the cloth presser frame 42 is supported by the support arm 43 so as to be movable up and down, and the press-up solenoid 44 imparts a lifting operation to the cloth presser frame 42 in the supported state. The press-up solenoid 44 is switched between driving in the pressing direction and driving in the releasing direction by a pressing switch 48 (see FIG. 4) that is input by the user of the buttonhole sewing machine 10.

The support arm 43 is supported at the rear end portion thereof by a support body 45 so as to be rotatable about the axis center along the X-axis direction, whereby the cloth holding frame 42 on the front end side is supported with respect to the cloth holding plate 41. It is possible to switch between cloth holding and releasing by raising and lowering.
Then, by driving the Y feed motor 46, the cloth presser frame 42 and the cloth holding plate 41 are both moved and positioned in the Y-axis direction with the same movement amount via the support arm 43 and the support body 45. Further, as described above, the sewing needle 11 is moved and positioned along the X-axis direction along the X-axis direction by the swinging of the needle bar support 21. Accordingly, it is possible to drop the sewing needle 11 at an arbitrary position with respect to the plane of the cloth held by the cloth holding frame 42 and the cloth holding plate 41.

(Hook mechanism)
The shuttle mechanism 60 is disposed in the vertical body portion 2c and is transmitted in the vertical axis 61 from the upper shaft 31 via the bevel gear, and is disposed in the sewing machine bed portion 2b, and from the vertical axis 61 via the bevel gear. A lower shaft 62 to which torque is transmitted and a hook 63 that is rotationally driven at a front end portion of the lower shaft 62 are provided. The hook 63 is rotationally driven in synchronization with the vertical movement cycle of the sewing needle 11, and the seam is formed on the fabric by the cooperation of the sewing needle 11 and the hook 63. The hook 63 is the same as a conventionally known one, and the structure thereof will not be described in detail.

(Female mechanism)
FIG. 3 is an exploded perspective view of the knife mechanism 70. As shown in FIG. 3, the knife mechanism 70 includes a knife 71 that forms a button hole in the fabric, a knife 71 that holds the knife 71 at its lower end and is supported so as to move up and down at the front end of the sewing machine arm 2a. A holding body 72, a tension spring 73 that constantly urges the tension of the knife holding body 72 upward, a knife drive cylinder 74 that moves the knife holding body 72 downward against the tension spring 73 by its drive, and a knife holding Proximity scalpel vertical position detection sensors 76 and 77 provided on the side of the body 72 and detecting the detected portion 75 of the scalpel holding body 72 are provided.

In the knife mechanism 70, the knife drive cylinder 74 drives the knife holder 72 downward by the control of the operation control means 100 described later, lowers the knife 71 to the inner region of the cloth presser frame 42, and sets the knife on the held cloth. A button hole is formed through 71. Further, since the cloth pressing frame 42 can be moved and positioned in the Y-axis direction by the cloth pressing mechanism 40, the button hole forming position can be positioned in the Y-axis direction.
Further, the knife lower position detection sensor 77 detects whether or not the knife 71 is lowered to a predetermined position required for cutting when it is lowered in the cutting drive, and outputs it to the operation control means 100 to detect the knife upper position detection sensor 76. Detects whether or not the knife 71 has returned to the original position at the time of return rise during cutting drive, and outputs it to the operation control means 100.

(Overall configuration of control system)
Next, a control system of the boring machine 10 will be described. FIG. 4 is a block diagram showing a control system of the buttonhole sewing machine 10. That is, as shown in the figure, the CPU 101 is connected to the ROM 102, RAM 103, Y feed counter 107, X feed counter 104, swing counter 105, female counter 106, interrupt controller 108, and I / O interface 109 via the bus. Among them, the CPU 101, the ROM 102, and the RAM 103 constitute the operation control means 100 described above.

The CPU 101 executes various programs stored in the ROM 102 and cooperates with the RAM 103 to function as a control unit that executes various controls and processes described later.
The ROM 102 stores various control programs and defaults.
The RAM 103 stores various variables for various controls, for example, sewing data, needle swing data, and the like.
The Y feed counter 107, the X feed counter 104, the amplitude counter 105, and the female counter 106 write each count value, and write a counter start command to output a one-pulse count signal after a time proportional to the count value has elapsed. Until the counter stop command is written, the counter output is repeated at a constant cycle. The interrupt controller 108 is for the CPU 101 to automatically execute an interrupt process corresponding to each interrupt signal in response to each interrupt signal input.
The I / O interface 109 is used by the CPU 101 to transmit / receive various signals to / from an external input / output device.

The operation panel 110 includes a display unit and various keys, and is used by an operator to perform various settings / operations necessary for sewing.
The Y-feed motor driver 111 uses the Y-feed counter output signal of the Y-feed counter 107 and the Y-feed direction +/- signal from the I / O interface 109 to generate one pulse for one counter output and + in the Y-feed direction. The Y feed motor 46 is rotated according to / −.
The X-feed motor driver 112 uses the X-feed counter output signal of the X-feed counter 104 and the baseline feed direction +/- signal from the I / O interface 109 to generate one pulse for one pulse output in the baseline feed direction + The X feed motor 24 is rotated according to / −.
The swing width adjusting motor driver 113 uses the swinging counter output signal of the swing width counter 105 and the needle swinging direction +/− signal from the I / O interface 109 for one pulse by one counter output. The swing adjustment motor 25 is rotated according to the direction +/-.

The knife drive cylinder drive circuit 123 drives the knife drive cylinder 74 by a cloth cutting up / down signal from the I / O interface 109.
The Y feed origin sensor 49 is for detecting the origin position of the Y feed motor 46.
The X feed origin sensor 26 is for detecting the origin position of the X feed motor 24.
The swing width adjustment origin sensor 27 is for detecting the origin position of the swing width adjustment motor 25.
The press switch 48 is an operation switch for the operator to raise and lower the cloth presser frame 42 when setting a work (cloth), and is related to a stepping operation of the sewing pedal.
The start switch 125 is an operation switch for an operator to start sewing when a work is set, and relates to a stepping operation of the sewing pedal.
The upper knife position detection sensor 76 and the lower knife position detection sensor 77 detect and detect the I / O interface depending on whether or not the detected portion 76 provided on the knife holder 72 is in the front position. The data is output to the CPU 101 via 109.

(Control outline: main control)
Next, specific control will be described with reference to FIG. 5 showing a general flow for performing control based on the control block shown in FIG. The following control executes various programs and functions as various control units and arithmetic means, the CPU 102 storing the various programs and defaults, and storing various data necessary for sewing, This is performed by sending and receiving signals by an operation control means including a RAM 103 functioning as a work area for each process and a non-volatile memory (not shown) for storing various data.

As shown in the general flow of FIG. 5, when the power is turned on, the CPU 101 first sets a power ON flag according to the program (step S1).
Next, an operation panel setting process is executed, and an input state for various settings by the operation panel 110 is set (step S2). Various setting operations using the operation panel 110 are performed until a sewing key is input in the next step S3. After the sewing key is turned on, a sewing data creation process is executed in the next step S4, and sewing data is generated. Is created. If the sewing key is not turned on in step S3, the process returns to the setting process in step S2.

After the sewing data is created, the cloth presser frame 42 is output downward in the next step S5. Subsequently, in the next step S6, the machine origin search process is executed, and the Y feed motor 46 / X feed motor 24 / swing is performed. The machine origin of the width adjustment motor 25 is searched.
Subsequently, at the next step S7, the sewing start movement is executed and the Y feed motor 46 / X feed motor 24 / oscillation width adjusting motor 25 is driven to the sewing start position. Then, at the next step S8, the cloth presser frame 42 is moved. Is output, and the process proceeds to the next step S9.

  In step S9, the input of the sewing key is checked. When the sewing key is turned on, the process returns to step S2 and the operation panel setting process is performed again. If the sewing key is not turned on, the process proceeds to the next step S10. move on. In step S10, the input of the press switch 48 is checked. When the press switch 48 is turned on, the process proceeds to the next step S11. When the press switch 48 is not turned on, the process returns to step S9. In step S11, it is determined whether or not the cloth presser frame 42 is in the raised state. If it is in the raised state, in the next step S12, the lowering output of the cloth presser frame 42 is performed. In step S13, the cloth presser frame 42 is raised and the process returns to step S9.

  After the fabric presser lowering output, the presser switch 48 is checked in the next step S14. When the presser switch 48 is on, the fabric presser frame 42 is raised in step S13 and the process returns to step S9. If the press switch 48 is not on, the process proceeds to the next step S15. In step S15, the start switch 125 is checked. When the start switch 125 is on, the process proceeds to the next step S16, and when the start switch 125 is not on, the process returns to step S14. In step S16, a sewing process is called and sewing is started. After the end of sewing, the cloth presser frame 42 is raised and output in the next step S17, and the process returns to step S9.

(Control overview: Operation panel setting process)
In the above-described operation panel setting process (step S2), a pattern change process for accepting a selection change of a plurality of types of sewing patterns in which various parameters necessary for sewing are set by inputting a sewing key, set in each of the sewing patterns. Parameter change processing that accepts setting changes of various parameters, speed change processing that accepts setting changes in the number of revolutions of the sewing machine motor that determines the sewing speed, and knife drive time setting processing that accepts setting inputs for each drive time in the vertical movement of the knife Are selectively executed, and information set in each process is recorded in the RAM 103 or a nonvolatile memory (not shown).

FIG. 6 is an explanatory diagram showing the dimensions of each part of the fabric as the sewing target on which buttonhole overturning is performed. The cloth cutting length a which is the length in the longitudinal direction of the button hole, the female width b which is the width of the button hole, and the first and second tacking portions C1 and C2 at both ends in the longitudinal direction of the cloth shown in FIG. The bar clamp length c (which is common to the bar clamp sections C1 and C2), the bar clamp width d which is the width of the bar clamp section (common to both bar clamp sections C1 and C2), and a button hole The parallel portion pitch e which is the sewing pitch in the right and left parallel portions C3 and C4 developed on both sides (both parallel portions C3 and C4 are common), and the tacking pitch f which is the sewing pitch in the tacking portion (parallel portion) C3 and C4 are common to each other), a first tacking gap g which is a gap length from one end of the button hole to the first tacking part C1, and a gap from the other end of the button hole to the second tacking part C2. 2nd bar clamp gap h which is long, knife size L which is cutting length of knife _{1. When} performing knife dropping multiple times, the parameters for the overlap length La of the knife and the overlap area of the previous knife drop are set and input as various parameters necessary for sewing. These combinations are stored in the RAM 103 or the non-volatile memory as sewing patterns. Each sewing pattern is assigned a pattern number, and each parameter is designated by specifying the pattern number.

As will be described later, the sewing machine speed is set to 4000 [rpm] (min ⁻¹ ) as a normal speed, and is controlled to be changed and adjusted to 3000, 2000, 1000, and 400 [rpm] according to the continuous knife driving time interval. In the speed change process, setting input from the operation panel 110 is individually accepted for each of these stepwise sewing speeds. The CPU 101 stores each input sewing speed in the RAM 103 or the nonvolatile memory. The unit for changing the sewing speed is 100 [rpm].

Further, in the knife drive time setting process, setting inputs from the operation panel 110 are accepted for the normal knife lowering drive time and the normal knife raising drive time during the knife drive. That is, the operation panel functions as an input unit that inputs the drive time of the vertical movement of the knife to the operation control unit 100. Then, the CPU 101 stores the input normal knife lowering drive time and normal knife lowering drive time in the RAM 103 or the nonvolatile memory. Further, the normal knife lowering drive time and the normal knife raising drive time are set in units of 10 [ms] and the shortest drive time is 30 [ms] (see FIG. 9).
The above-described knife drive cylinder 74 is a cylinder that is driven in both the up and down directions. When the knife is lowered, the CPU 101 is a normal knife lowering drive time set to supply fluid to the lowering drive port of the knife driving cylinder 74. Continuous operation control is performed, and when the knife is raised, operation control is performed to continue the normal knife raising drive time for which fluid supply to the raising drive port of the knife drive cylinder 74 is set.

(Control outline: Sewing data creation process)
In the above-described sewing data creation process (step S4), the CPU 101 performs a reduction or enlargement calculation at a specified magnification for various parameter values in the selected sewing pattern, and executes the respective values at the time of sewing. To record.
In the sewing data creation process, a designation input for performing sewing in the clockwise direction or the counterclockwise order around the button hole is accepted. If it is clockwise, sewing is performed in the order of the left parallel part C4, the first tacking part C1, the right parallel part C3, and the second tacking part C2, and if it is counterclockwise, the right parallel part C3, the first Sewing is performed in the order of the tacking portion C1, the left parallel portion C4, and the second tacking portion C2. Further, a calculation for determining a sewing start position is performed in accordance with which region the sewing is started from.
Then, in accordance with the clockwise or counterclockwise input, processing for determining the sewing order of the needle drop positions in each region is performed, and the calculation result is stored in the RAM 103 in preparation for the execution of sewing.

In the sewing data creation processing, processing for calculating at which timing the knife 71 should be driven in a series of sewing processes is performed.
FIG. 7 shows a subroutine for the knife drive timing calculation, and the number of needles that are the operation timing of the knife drive corresponding to the knife drive times 1 to n will be described as M1 to Mn. Note that the number of knife driving needles M1 to Mn corresponding to the number of knife driving times 1 to n obtained by the calculation described later is stored in the RAM 103.

  In this knife drive timing calculation, as shown in FIG. 7, first, in step S31, the number of stitches M up to the right parallel portion start position is calculated, and then in the next step S32, Mn = ((L1 + g). ÷ e) Calculate + M. Here, an example is shown in which the sewing data creation process is set to perform sewing in the counterclockwise order around the button hole, and in the case of setting to perform sewing in the clockwise direction, in step S31. The number of stitches up to the left parallel part start position is calculated.

Subsequently, in the next step S33, the remaining dimension x = a−L1 obtained by subtracting the knife size from the cloth cutting length is calculated. A knife 71 having a knife size L1 shorter than the cloth cutting length a (side stitched portion) is used.
Then, in the next step S34, it is determined whether or not the remaining dimension x = 0. If it is not 0, n is incremented by 1 in the next step S35, and the process proceeds to the next step S36. If 0, the process proceeds to step S40 as it is.

In step S36, La is a preset amount of female overlap. In this step S36, x> (L1-La) is checked.
That is, if x> (L1−a) in step S36, Mn = {(L1−La) ÷ e} + Mn−1 is calculated in the next step S37, and x> (L1−La). Otherwise, the process proceeds to step S38, and Mn = x ÷ e + Mn-1 is calculated. Further, after calculating Mn = {(L1−La) ÷ e} + Mn−1, x = x− (L1−La) is calculated in the next step S39, and the process returns to step S34. Further, after the calculation of Mn = x ÷ e + Mn−1, it is determined in the next step S40 whether or not the knife dropping timing correction stitch number is 0. If it is 0, the above-described step of the general flow (FIG. 5) is performed as it is. The process proceeds to S5, and if not 0, in the next step S41, Mn + “number of knife drop timing correction stitches” is set in Mn, and then the process proceeds to step S5.

(Control outline: Machine origin search processing)
Next, the machine origin search process (step S6) will be described. First, the Y feed motor 20 is driven while checking the Y feed origin sensor 49, and the origin position of the Y feed motor 20 is searched. After searching the origin of the Y feed motor 20, 0 is set to the Y feed position. Subsequently, the X feed motor 24 is driven while checking the X feed origin sensor 26 to search the origin position of the X feed motor 24, and then 0 is set to the X feed position. Then, after driving the swing width adjusting motor 25 while checking the swing width adjusting origin sensor 58 and searching for the origin position of the swing width adjusting motor 25, the needle swing position is set to 0, and then the general flow is set. The process proceeds to step S7 in FIG.

(Control outline: Sewing process)
Next, the sewing process (step S16) will be described.
In the sewing process, the count value of the number of stitches is set with an initial value of 0, and the count value is incremented by 1 for each rotation of the sewing machine motor 32. Further, the total number of stitches in a series of sewing steps is set as an initial value of the remaining number of stitches, and the count value is decremented by 1 for each rotation of the sewing machine motor 32. The rotation of the sewing machine motor 32 is counted by the output of the needle upper position sensor 116 (see FIG. 4) that detects that the sewing needle 11 has come above the needle plate.
Each time the stitch count value is added, the Y feed motor 46, the X feed motor 24, and the swing width adjusting motor 25 are driven by a predetermined drive amount in accordance with the above-described sewing data, and the sewing needle 11 is set to a predetermined value on the fabric. Drop the needle into position.

On the other hand, when the count value of the stitches approaches within a predetermined range the number of stitches Mn to be driven by the knife calculated in the sewing data creation process described above, the knife driving process shown in FIG. 8 is executed.
In the knife driving process, first, in step S61, it is checked whether or not the needle count is Mn-5. If Mn-5, the process proceeds to the next step S62, and if not Mn-5. The process proceeds to step S71 as it is. In step S62, it is checked whether Mn + 1−Mn, ie, the difference between the next knife driving needle number Mn and the next knife driving needle number Mn + 1 is 1, and if it is 1, the process goes to step S63. The process proceeds to step S71 after the scheduled first knife driving speed is set to 400 [spm] (= min ⁻¹ ) in the RAM 103, and if Mn + 1−Mn is not 1, Proceed to the next Step S64. In step S64, it is checked whether or not Mn + 1−Mn is 2. If it is 2, the process proceeds to step S65, and the scheduled first female driving speed is set to 1000 [spm] in the RAM 103. Then, the process proceeds to step S71, and if Mn + 1−Mn is not 2, the process proceeds to the next step S66.

  In step S66, it is checked whether Mn + 1−Mn is 3. If it is 3, the process proceeds to step S67, and the scheduled first knife driving speed is set to 2000 [spm] in the RAM 103. Then, the process proceeds to step S71, and if Mn + 1−Mn is not 3, the process proceeds to the next step S68. In step S68, it is checked whether or not Mn + 1−Mn is 4. If it is 4, the process proceeds to step S69, and the scheduled first knife driving speed is set to 3000 [spm] in the RAM 103. Then, the process proceeds to step S71, and if Mn + 1−Mn is not 4, the next first knife driving speed is set to 4000 [spm] in the RAM 103 in the next step S70. The process proceeds to the next step S71. By controlling the steps S61 to S70, the sewing speed can be controlled in accordance with the operation interval (number of stitches) of the knife, so even if two consecutive knife drive intervals are close, the first knife is moved. After the descent, the knife can be reliably returned to the raised position by the next descent.

In step S71, the power ON flag set in step S1 (FIG. 5) is checked. If the power ON flag is set, the process proceeds to step S72. If the power ON flag is cleared, the process proceeds to step S73.
In step S72, the CPU 101 executes a process of extending the drive times of the normal knife lowering drive time and the normal knife raising drive time set in the knife drive time setting process. The driving time extension process may be a process of adding a predetermined time or a process of multiplying a predetermined ratio. The extended normal knife lowering drive time and normal knife raising drive time are stored in the RAM 103 as the initial moving knife lowering driving time and the initial moving knife raising drive time, respectively.

In step S <b> 73, the CPU 101 executes a process for specifying the sewing speed corresponding to the knife driving time. When the initial moving knife lowering driving time is calculated by the processing of step S72, the initial moving knife lowering driving time is adopted as the knife driving time here, and based on this, the second knife driving time which is the sewing machine speed is adopted. Speed is required. When the process of step S72 is not performed, the normal knife lowering drive time is adopted, and based on this, the second knife driving speed, which is the sewing speed, is obtained. That is, as an example, if the knife descent or ascending drive time is set to 30 [ms] in the knife drive time setting process (step S2), the value is directly adopted as the knife drive time in the subsequent knife drive. .
FIG. 9 is a table showing the relationship between the knife driving time and the sewing speed selected by the knife driving speed (second knife driving speed). Such a table is preset in the ROM 102, and is referred to when the second knife driving speed is specified.
In the table, the sewing machine speed is set to be slower as the knife driving time becomes longer. Thereby, even if the driving time of the vertical movement of the knife 71 is set long and the cutting force and the reciprocating driving force are sufficiently secured, the needle operation and the cloth feeding operation can be slowed correspondingly, It is possible to secure the time until the next knife lowering and to avoid the breakage of the fabric and the cutting of the ground yarn by slowing the cloth feed.

In step S74, it is checked whether or not the stitch count is Mn-R (R is any integer value less than 5) or more. If Mn-R or more, the process proceeds to step S75. If it is less than -R, the process proceeds to step S78.
In the next step S75, it is compared whether the first knife driving speed stored in the RAM 103 is equal to or higher than the second knife driving speed, and a slower speed is selected. That is, when the first knife driving speed is equal to or higher than the second knife driving speed, the process proceeds to step S76, and operation control for driving the sewing machine motor 32 at the second knife driving speed is performed. If the speed at which the knife is driven is exceeded, the process proceeds to step S77 where operation control for driving the sewing machine motor 32 at the first knife driving speed is performed.

In step S78, it is checked whether or not the needle count is Mn. If not yet Mn, the knife driving process is terminated. When the count of needles newly proceeds, a new knife driving process is executed again from step S61.
In step S78, if the needle count is Mn, the process proceeds to the next step S79, and the knife lowering process is executed.
Further, in step S79, after the knife is lowered, the process proceeds to step S80, and if the power ON flag is set, a clearing process is executed. Thereafter, the variable n indicating the current number of times of knife drive is incremented by 1, and then the knife drive process is terminated. In this case as well, when the count of needles newly proceeds, a new knife driving process is executed from step S61.

FIG. 10 shows a subroutine of the knife lowering process (FIG. 9: step S79) in the knife driving process. First, in step S101, a knife lowering output is sent to the knife driving cylinder driving circuit 123 based on a predetermined stitch count. The knife 71 is lowered by driving the knife driving cylinder 30.
Next, in step S102, the power ON flag set in step S1 (FIG. 5) is checked. If such a power ON flag is set, the process proceeds to step S103, and if the power ON flag is cleared, the process proceeds to step S104.

In step S103, the CPU 101 refers to the initial moving knife lowering driving time set in the knife driving time setting process, outputs the count value corresponding to the lowering driving time to the knife counter 106, and proceeds to step S105.
On the other hand, in step S104, the CPU 101 refers to the normal knife lowering drive time set in the knife driving time setting process, outputs the count value for the lowering driving time to the knife counter 106, and proceeds to step S105.
Subsequently, in the next step S105, the knife counter 106 is activated. Then, in the next step S106, 1 is set in the knife lowering flag, and then the process proceeds to step S80 in the flow of FIG.

Next, FIG. 11 shows a subroutine of the knife counter interruption process. This process is executed at a predetermined cycle in a series of steps of the sewing process (FIG. 5: step S16).
First, in step S121, it is checked whether or not the counter of the female counter 106 is 0. If it is 0, the process is terminated, and the counter check is repeated at a predetermined cycle. If not 0, 1 is decremented from the counter in the next step S122.
Subsequently, in the next step S123, it is checked again whether or not the counter is 0. If it is 0 for the first time in this step, the process proceeds to the next step S124. The counter check is repeated again from step S121 at a predetermined cycle.
In step S124, a knife drive check is performed. After the check, in the next step S125, it is checked whether or not the knife lowering flag is 2. If it is 2, the process proceeds to step S126, and must be 2. If so, the process proceeds to step S127.

That is, in step S127, the knife counter 106 is stopped, and in the next step S129, the knife lowering flag is set to 0. Then, the process is terminated, and the counter check is repeated from step S121 again at a predetermined cycle.
In step S 126, a knife raising output is output to the knife driving cylinder driving circuit 123, and the knife 71 is raised by driving the knife driving cylinder 30. Subsequently, after stopping the knife counter 106 in the next step S128, the count value for the rising time is output to the knife counter 106 in the next step S130. Then, after starting the knife counter 106 in the next step S131, after setting the knife lowering flag to 2 in the next step S132, the process is terminated, and the counter check is repeated from step S121 again at a predetermined cycle. .

Next, FIG. 12 shows the subroutine of the knife drive check (FIG. 11: step S124). First, in step S151, it is checked whether or not the knife lowering signal to the knife drive cylinder drive circuit 123 is being output. If it is being output, the process proceeds to the next step S152, and if it is not being output, the process proceeds to step S153.
In step S152, it is checked whether or not the knife lower position detection sensor 77 is on. If it is on, it is assumed that the knife is normal, and the process returns to step S125 of the flow of FIG. Proceed to
In step S153, it is checked whether or not the knife lower position detection sensor 77 is off. If it is off, the process returns to step S125 in FIG. 11, and if not off, the process proceeds to the next step S154.
In step S154, it is assumed that the knife 71 has not reached the originally planned lower position by the lowering drive or is kept at the lower position that should not be originally by the raising driving, and then the next step is started after the knife driving error is issued. In S155, after outputting a sewing machine stop output, the process returns to step S125 of FIG.

(Control outline: Operation explanation)
In the buttonhole sewing machine 10 of the present embodiment having the control method as described above, the flow of buttonhole sewing work according to the control will be described. After the operator has set each numerical value on the operation panel 110 (FIG. 5: Step S2), positioned at the sewing start position by the sewing start movement in step S7, and stopped with the cloth presser frame 42 lowered. When the start switch is operated by the operator (FIG. 5: Step S15), “sewing” in Step S16 starts.

When clockwise sewing is selected in the sewing data creation process by this sewing subroutine, the motors 24, 25, 46 are controlled to perform left side sewing (left parallel portion), first bark sewing, right side sewing. When the sewing progresses (right parallel part sewing) and the second barrack sewing, and when the stitch count value reaches the calculation set value Mn during the right sewing process (FIG. 8: step S78), the knife lowering subroutine is executed. The knife 71 is lowered.
At this time, the sewing machine speed is set to either the first knife driving speed or the second knife driving speed when the knife 71 is lowered several times before or when the knife 71 is lowered according to the set value of R in Step S74 (preset). Decrease to a slower speed. This operation is repeated a number of times according to the calculated numerical value n (FIG. 8: Step S81).
When the number of remaining stitches becomes zero, the buttonhole sewing is completed, a sewing machine stop output is output, and the sewing machine is stopped at the needle up position by a conventionally known fixed position stop means.

(Effect of embodiment)
The CPU 101 of the operation control means 100 having the above configuration performs the normal knife lowering drive time and the normal knife raising drive time by executing the program and performing the knife driving time setting process during the operation panel setting process (step S2 in FIG. 5). Processing for accepting setting input from the operation panel 110 is executed.
Further, the CPU 101 of the operation control means 100 selects a slower sewing speed as the driving time becomes longer, depending on the arbitrarily set normal knife lowering driving time or the initial moving knife lowering driving time based on this by executing the program. The process which performs is performed (step S73 of FIG. 8).
By each of the above processes, the knife drive time setting process is set in advance so that the drive time for the vertical movement of the knife is set long and sufficient cutting force and reciprocating drive force are secured. It is possible to suppress the failure to reach the lower position and the return failure to the upper position due to a cause such as the knife 71 being pinched by the cloth, and to improve the stability of the knife drive.
In addition, the speed of the sewing machine motor is slowed in accordance with the extension of the knife drive time, ensuring the stability of knife drive and ensuring the time until the next knife descends, and the cloth feed It becomes possible to avoid the breakage of the fabric and the cutting of the yarn by slowing down the speed.

In addition, the CPU 101 of the operation control means 100 having the above-described configuration is operated in the proximity of the number of knife driving needles to be executed next and the number of needles for the next knife driving by the knife driving process. A process of selecting a slower sewing speed is performed (steps S62 to S70 in FIG. 8).
As a result, even when the knife drive timing is approaching, the knife drive time until the next time is secured by the slowing down of the sewing machine motor, the occurrence of knife drive failure is suppressed, and a more stable cutting operation is realized. Can do.

Furthermore, the CPU 101 of the operation control means 100 selects the slower one of the sewing speed specified according to the knife driving time and the sewing speed specified when the knife driving timing is approaching by executing the program. Is executed (steps S75 to S77 in FIG. 8).
As a result, it is possible to increase both the effects of specifying the sewing speed according to the knife driving time described above and specifying the sewing speed according to the adjacent knife driving timing.

Further, the CPU 101 of the operation control means 100 performs the normal knife lowering drive time set in the knife drive time setting process (step S2) in the initial stage knife drive from the main power ON of the boring machine 10 by executing the program and the program execution. Operation control for driving the knife driving cylinder is executed in accordance with the initial knife moving descent driving time and the first knife moving up drive time longer than the normal knife raising drive time (step S1 in FIG. 5, steps S71 and S72 in FIG. 8, and S102 in FIG. 10). , S103, S104).
With the above control, the knife is raised or lowered in a long drive time, so that inadequate supply pressure due to long-time drive can be compensated for, particularly in the initial stage of drive start where the internal pressure drop state of the knife drive cylinder 74 is likely to occur. It is possible to suppress a failure to reach the lower position or the upper position of 71 and further improve the stability of the knife drive.

(Other)
In the above embodiment, the CPU 101 of the operation control unit 100 performs the process of specifying the drive speed of the sewing machine motor 32 according to the normal or initial moving knife lowering driving time. The process of specifying the rotation speed of the sewing machine motor 32 may be performed based on the initial movement when the process of S72 is performed and the normal operation is selected when the process is not performed. Further, the processing for specifying the speed of the sewing machine motor 32 may be performed by the total time of the knife lowering drive time and the knife raising drive time.

In the above embodiment, only the first female drive after power-on is controlled to drive for a longer time than the subsequent female drive. It is good also as a structure driven in a long time rather than subsequent knife drive.
In that case, first, a numerical value of the number of times of long-time driving is input in advance to the RAM 103 or the nonvolatile memory by the operation panel 110 as an input means of the number of times of long-time driving.
And in step S1 mentioned above, it replaces with the process of setting a power ON flag, and the process of starting the count of the counter which counts the preset frequency is provided.
In step S71 described above, instead of the step of checking the setting of the power ON flag, a step of checking whether the count value of the counter is equal to or smaller than the set number is provided (if the number is equal to or smaller than the set number, the process proceeds to step S72. If not, go to step S73).
In step S80 described above, a step of adding 1 to the count value of the counter is provided instead of the step of clearing the power ON flag.
Accordingly, it is possible to execute control in which the knife drive is performed for a longer time than the subsequent knife drive in a plurality of times of knife drive from the first time.
As a result, even if the first time only is insufficient to compensate for the deficiency of the driving force of the knife drive cylinder 74, the deficiency of drivability can be sufficiently compensated for by driving multiple times for a long time. It becomes.

1 is an external perspective view of a boring machine as an embodiment of the invention. It is a schematic perspective view which shows the internal structure of a hole sewing machine. It is a disassembled perspective view of a knife mechanism. It is a block diagram which shows the control system of a hole sewing machine. 6 is a flowchart showing overall operation control of the sewing machine based on the control system shown in FIG. It is explanatory drawing which shows the dimension of each part of the fabric as a target of buttonhole hoisting. It is a flowchart which shows the subroutine of a knife drive timing calculation in sewing data creation processing. It is a flowchart which shows the subroutine of the knife drive process in a sewing process. It is explanatory drawing of the table which shows the relationship between the knife drive time referred in the knife drive process, and the 2nd knife driving speed selected by it. It is a flowchart which shows the subroutine of the knife downward process in a knife drive process. It is a flowchart which shows the subroutine of the female counter interruption process performed with a predetermined period within a sewing process. It is a flowchart which shows the subroutine of the knife drive check process in a knife counter interruption process.

Explanation of symbols

2 Sewing frame 10 Hole sewing machine 11 Sewing needle 20 Needle swing mechanism 30 Needle drive mechanism 32 Sewing motor (sewing drive means)
34 Needle bar 40 Cloth holding mechanism 70 Female mechanism 71 Female 100 Operation control means 101 CPU
102 ROM
103 RAM
110 Operation panel (input means)

Claims (5)

A needle drive mechanism for moving the sewing needle up and down by the sewing machine drive means;
A cloth presser mechanism that moves and positions the cloth in synchronization with the vertical movement of the sewing needle;
A knife mechanism for perforating the cloth held by the cloth pressing mechanism by moving the knife up and down;
An operation control means for controlling the vertical movement of the knife, and a boring machine comprising:
The operation control means performs drive control of the knife mechanism in accordance with a set drive time for moving the knife up and down, and a driving speed of the sewing machine drive means in accordance with the length of the set drive time for moving the knife up and down. A boring machine characterized by performing operation control to increase or decrease the speed. The operation control means has a function of increasing or decreasing the driving speed of the sewing machine driving means according to the length of each vertical movement interval when the knife is moved a plurality of times.
Comparing the driving speed of the sewing machine driving means based on the vertical movement interval of the knife with the driving speed of the sewing machine driving means based on the set driving time of the vertical movement of the knife, based on the slower driving speed A boring machine that controls the sewing machine driving means. 3. The boring machine according to claim 1, wherein the operation control means performs operation control for driving at least the first vertical movement of the knife after power-on in a drive time longer than that during normal sewing. 4. The boring machine according to claim 3, further comprising an input means for inputting at least the first drive time of the vertical movement of the knife after the power is turned on to the operation control means. 5. The operation control means can set how many times from the first time the knife is moved up and down for a longer driving time than normal sewing after the power is turned on. Boring machine.

Images