JP3839070B2 - Sewing machine free arm length switching device - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a sewing machine having both functions of normal sewing and embroidery sewing, and more particularly, to a sewing machine configured so that a usable free arm length can be changed during normal sewing work.
[0002]
[Prior art]
Conventionally, in a sewing machine having both functions of normal sewing and frame embroidery, as shown in FIG. 1, the frame embroidery carriage 22 is moved to the storage position B close to the base portion of the free arm 50 by the initial setting of the sewing machine. Stored. In this state, when the normal sewing is selected and the flat bed operation is performed, the carriage 22 does not interfere with the cloth to be sewn, and a preferable result can be obtained.
[0003]
However, when performing a free arm sewing operation of normal sewing with such a type sewing machine, the longitudinal direction of the free arm portion from the needle drop point to the root portion of the free arm portion 50 is parallel to the free arm portion 50 as shown in FIG. There is a problem that the free arm length L1 that should originally be usable in the X direction has to be shortened by the length L by the carriage 22 stored in the storage position B.
[0004]
On the other hand, in the sewing machine according to the present invention, a drive motor 38 and an amplitude controller 34 for driving the sewing machine are provided in the standing body 52 of the sewing machine adjacent to the base of the free arm 50 as shown in FIG. In addition to an amplitude control motor 30 for controlling and a feed control motor 32 for controlling a feed control mechanism (not shown), various types such as an X drive motor 24 and a Y drive motor 26 for controlling an XY drive mechanism 28 for frame embroidering. In addition to the motor, many parts are arranged in a limited space.
[0005]
Accordingly, when the carriage 22 is stored in the storage position B and an attempt is made to secure a sufficient usable free arm length, the dimension in the X direction from the root of the free arm 50 to the needle drop point is increased. In addition to the necessity, the needle bar mechanism needs to be provided at a position moved to the left side of FIG. 1 in parallel with the X direction, and there is a problem that the sewing machine must be enlarged.
[0006]
[Problems to be solved by the invention]
The problem to be solved by the present invention is to increase the usable free arm length when normal sewing is selected with a sewing machine having both functions of normal sewing and frame embroidery without increasing the size of the sewing machine. In other words, the usable free arm length can be expanded to a sufficient length by the user's selection operation, and when it is no longer necessary, the original state can be restored.
[0007]
[Means for Solving the Problems]
The present invention relates to frame embroidery that forms an embroidery stitch by controlling the embroidery stitching position that is separated from the free arm portion of the sewing machine frame at the time of embroidery sewing. The carriage from which the embroidery frame has been removed is stored in a storage position close to the free arm portion of the sewing machine frame so that a desired stitch pattern can be formed by selectively switching between normal sewing by needle and feed back and forth movement. In the sewing machine, when the normal sewing is selected, the driving mechanism is driven and the carriage from which the embroidery frame has been removed is moved to the storage position close to the free arm portion of the sewing machine frame, and the normal sewing for the flat bed operation is performed. A predetermined position where the carriage from which the embroidery frame has been removed is separated from the free arm by driving the drive mechanism There is a selection key for controlling and selecting a normal sewing that has been moved to a predetermined position for expanding the usable free arm length from the needle position to the free arm end of the sewing machine frame. The problem could be solved.
[0008]
[Effects of the Invention]
According to the present invention, the length of the free arm that can be used as necessary can be expanded by the user's selection operation, and when it is no longer needed, it can be returned to its original state. There is an effect that the application range of free arm sewing is expanded without increasing the size and the usability of the sewing machine is improved.
[0009]
【Example】
FIG. 1 is a perspective view of a sewing machine according to the present invention, and the sewing machine 2 has a normal sewing function and a frame embroidery sewing function. A keyboard 4 and a display device 10 are disposed on the front panel of the sewing machine 2. Reference numeral 12 denotes a base, and an XY drive mechanism 28 for frame embroidering is disposed in the base 12 as shown in FIG. 2, and a carriage 22 at the output end projects from the base 12.
[0010]
The keyboard 4 includes mode selection keys such as an embroidery mode key 6 for selecting frame embroidery for the sewing machine and a normal sewing mode key 8 for selecting normal sewing. The display device 10 functions as various screen keys by operations in addition to various displays relating to sewing, and various screen keys include a long key 15 and a short key 16 for changing a usable free arm length.
[0011]
Next, the XY drive device 20 for frame embroidery will be described with reference to FIG. The XY drive device 20 that forms the main part of frame embroidery includes an X drive motor 24, a Y drive motor 26, and an XY drive mechanism 28 that is connected to these and controlled to drive. An embroidery frame 18 (FIG. 6) is attached to the carriage 22 of the output portion of the XY drive mechanism 28.
[0012]
In FIG. 2, the amplitude control motor 30 and the feed control motor 32 are motors for controlling the stitch control mechanism 36 (FIG. 6) of the sewing machine. The amplitude control motor 30 controls the amplitude control mechanism 34 and the feed control motor 32. Controls a feed control mechanism (not shown). The drive motor 38 drives the stitch forming means.
[0013]
Next, a control block diagram of the sewing machine of the present invention will be described with reference to FIG. The keyboard 4 is an embroidery mode key 6 for selecting an embroidery mode specific to the pattern group stored in the embroidery pattern storage means 14, and a normal sewing mode for selecting a normal sewing mode specific to the pattern group stored in the normal sewing pattern storage means 44. A mode selection means including a sewing mode key 8 is included and connected to the general control device 40. The total control device 40 is composed of a CPU, a storage means storing a sewing machine control program, and various storage means necessary for executing the program.
[0014]
The general control device 40 controls the display control circuit by operating the keyboard 4 or the like, and causes the display device 10 to display various screen keys by operating in addition to various displays related to sewing. A long key 15 and a short key 16 (FIG. 5) for changing the length are included.
[0015]
In addition to the drive motor 38 for driving the sewing machine, various stepping motors are connected to the overall control device 40, and these stepping motors are controlled in each phase section of the sewing machine detected by the upper shaft phase detector 42. They are an amplitude control mechanism 34 for the sewing machine, an amplitude control motor 30 for controlling a stitch control mechanism 36 comprising a feed control mechanism, a feed control motor 32, an X drive motor 24 for controlling an XY drive mechanism 28 for embroidery stitching, Y drive motor 26.
[0016]
Next, the operation of the sewing machine free arm length switching device of this embodiment will be described with reference to the flowchart of FIG. 7 and the related drawings. When the sewing machine is turned on, the program starts. In step S1, the X drive motor and the Y drive motor are initialized, and the carriage 22 of the XY drive mechanism 28 is stored in the storage position B.
[0017]
When normal sewing is selected here and the change mode of free arm length is selected on the sewing machine pattern selection screen, a long key 15 and a short key 16 for changing the free arm length as shown in FIG. The screen changes to the free arm length change screen on which the free arm length change key is displayed.
[0018]
When the long key 15 is pressed on the free arm length change screen shown in FIG. 5, it is determined in step S <b> 2 and the process proceeds to step 3. In step S3, the carriage 22 is set to move from the storage position B shown in FIG. 3 to a predetermined position C separated by Y1 as shown in FIG. 4 in the Y direction perpendicular to the longitudinal direction (X direction) of the free arm portion 50. .
[0019]
The cloth to be sewn can pass through the gap between the carriage 22 and the free arm portion 50, and the usable free arm length in this state is the length L between the needle drop point and the left end surface of the carriage. It expands to a sufficient length L1 (FIG. 1) from the needle entry point to the base of the free arm. In the present embodiment, the value of the predetermined amount Y1 is set to a value of about 17 to 20 mm so that the cloth to be sewn under various conditions can pass.
[0020]
When the flatbed operation for normal stitching is performed after the carriage 22 is set at the predetermined position C, the workability is better when the carriage is stored in the storage position B as shown in FIG. When the short key 16 is pressed on the free arm length change screen shown in FIG. 5, this is determined in step S2, and the process proceeds to S4. The carriage 22 is moved from the predetermined position C to the storage position B as shown in FIG. Return to.
[0021]
As described above, in this embodiment, when the normal sewing is selected, the operation of the long key 15 causes the carriage 22 to move to a predetermined position separated from the storage position, thereby increasing the usable free arm length.
[0022]
Accordingly, the length of the free arm is not limited by the carriage stored in the storage position when the normal sewing is selected as in the conventional example, so that the width of the carriage 22 in the X direction in FIG. At the time of embroidery sewing, the embroidery frame can be attached to the carriage 22 in a more stable state than before.
[0023]
【The invention's effect】
As described above, according to the present invention, a sewing machine that can selectively switch between normal stitching and frame embroidery stitching to form a desired stitch pattern can be used as needed during normal sewing free arm work. The free arm length can be expanded by the user's selection operation, and when it is no longer necessary, it can be restored to its original state, so the application range of free arm sewing can be increased without increasing the size of the sewing machine. The effect of expanding and improving the usability of the sewing machine can be obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view of a sewing machine. FIG. 2 is a perspective view showing an XY drive device of the sewing machine. FIG. 3 is a view corresponding to an arrow A in FIG. 1 showing a state where a carriage is stored in a storage position. 4] A view corresponding to the arrow A in FIG. 1 showing a state where the carriage is set at a predetermined position [FIG. 5] A view showing a screen for changing a free arm length [FIG. 6] A control block diagram of a sewing machine [FIG. 7] Free Flow chart of arm length switching control [Explanation of symbols]
2 Sewing machine 15 Long key 16 Short key 22 Carriage 50 Free arm B Carriage storage position C Carriage predetermined position

Claims (1)

  When embroidering the carriage, which is connected to the driving mechanism and mounting the embroidery frame, the embroidery stitch is formed by controlling the embroidery stitching position by separating it from the free arm of the machine frame, and the embroidery frame is used for normal sewing. In a sewing machine in which the removed carriage is stored in a storage position close to a free arm portion of a sewing machine frame, and a desired stitch pattern can be formed by selectively switching between normal sewing by needle and feed back and forth movement. A normal sewing for a flat bed operation in which the drive mechanism is driven to remove the embroidery frame when the normal sewing is selected, and the carriage is moved to a storage position close to the free arm portion of a sewing machine frame; and the drive mechanism To control the carriage from which the embroidery frame has been removed to a predetermined position separated from the free arm portion. A selection key is provided for selecting a normal sewing machine moved to a predetermined position for expanding the usable free arm length from the needle position to the free arm end of the sewing machine frame. Sewing machine free arm length switching device.

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