JPH07313767A - Automatic feed dog dropping device for sewing machine - Google Patents

Abstract

PURPOSE:To improve the convenience of a sewing machine by automatically setting the state of a feed dog required for the sewing state of the sewing machine or a sewing pattern selected by a user corresponding to that state or pattern. CONSTITUTION:Concerning the sewing machine which can form the desired pattern by selectively switching normal sewing and frame embroidery sewing, a feed dog dropping device 50 is operated by the move control of an X-Y driving mechanism 28 so that the feed dog can be set in the up or down state corresponding to the sewing state of the sewing machine selected by the user or the pattern selected in the case of normal sewing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine having both functions of ordinary sewing and embroidery stitching, and in particular, ordinary sewing,
The present invention relates to a device for automatically setting the state of the feed dog of frame embroidery sewing.

[0002]

2. Description of the Related Art Conventionally, in a sewing machine having both normal stitching and frame stitching functions, for example, when the embroidery mode is selected, the operator manually operates the setting of the state of the feed dog. It was inconvenient to forget the operation.

[0003]

The problem to be solved by the present invention is to automatically set the state of the feed dog in accordance with the sewing mode and the pattern selection.

[0004]

In order to solve the above-mentioned problems of the prior art, the present invention provides a sewing machine capable of forming a desired pattern stitch by selectively switching between normal stitching and frame stitching. When the embroidery stitch is selected, the feed dog drop device is operated by the XY drive mechanism for the embroidery stitch to set the feed dog to the down state.

Further, in a sewing machine capable of selectively switching between normal stitching and frame stitching to form a desired pattern stitch, when the stitching is switched from normal stitching to normal stitching, it is fed by an XY drive mechanism for stitching. The tooth drop device is operated to set the feed dog from the down state to the up state.

Further, in a sewing machine capable of selectively switching between normal sewing and frame stitching to form a desired pattern stitch, an XY drive mechanism for embroidery sewing is selected when the feed tooth down command pattern of the normal stitch is selected. Is configured to operate the feed dog drop device to set the feed dog in the down state.

[0007]

According to the present invention, the sewing condition of the sewing machine selected by the user or the state of the feed dog necessary for the sewing pattern is automatically set in accordance with the selected pattern, so that the usability of the sewing machine is improved. .

[0008]

EXAMPLES The present invention will be described below with reference to examples. Figure 1
Is a perspective view of a sewing machine according to the present invention, and the sewing machine 2 is
It has a normal sewing function and a frame stitching function. A keyboard 4 and a display device 10 are provided on the front panel of the sewing machine. Reference numeral 12 is a base, 22 is a carriage for frame embroidery stitching, and 14 is an embroidery pattern storage means composed of an IC card used in the embroidery mode.

The keyboard 4 includes mode selection keys such as an embroidery mode key 6 for selecting an embroidery sewing machine and a normal sewing mode key 8 for selecting a normal sewing machine. Besides, it functions as various screen keys, and the pattern selection key 16 is included in the various screen keys.

Next, referring to FIG. 2, an XY drive device 20 for frame embroidery sewing will be described. The XY drive device 20 which is the main part of the frame embroidery stitching is composed of an X drive motor 24, a Y drive motor 26, and an XY drive mechanism 28 which is connected to these and is drive-controlled. XY
An embroidery frame is attached to the carriage 22 at the output of the drive mechanism 28.

In FIG. 2, the amplitude control motor 30 and the feed control motor 32 are motors for controlling the stitch control mechanism for normal sewing, and the amplitude control motor 30 controls the amplitude control mechanism 34. It also functions as the X drive motor 24 of the XY drive device 20 by switching. The feed control motor 32 controls the feed control mechanism 36 (FIG. 3). Further, in FIG. 2, the drive motor 38 drives the stitch forming means.

Next, a control block diagram of the sewing machine of the present invention will be described with reference to FIG. Keyboard 4
Embroidery mode key 6 for selecting a unique embroidery mode stored in the embroidery pattern storage means 14, and normal sewing mode key 8 for selecting a normal sewing mode unique to the pattern group stored in the normal sewing pattern storage means 44. It is connected to a general control device 40 including a mode selection means including a storage means in which a control program for the CPU and the sewing machine is stored, various storage devices necessary for executing the program, and the like.

The integrated control device 40 controls the display control circuit by operating the keyboard 4 or the like to cause the display device 10 to display various screen keys in addition to various displays relating to sewing, and the pattern selection key 16 is included in the various screen keys. Is included. The pattern selection key 16 selects a desired pattern from a plurality of patterns designated by the mode selection means.

Various stepping motors are connected to the total 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 the amplitude control motor 3 for controlling the stitch control mechanism including the amplitude control mechanism 34 and the feed control mechanism 36 of the sewing machine.
0, feed control motor 32, X drive motor 24 for controlling XY drive mechanism 28 for embroidery, Y drive motor 2
It is 6.

The feed dog drop device 50 is moved and set by the carriage 22 of the XY drive mechanism 28 by the X drive motor 24 and the Y drive motor 26, and the set state is detected by the detection switch 46.

Next, the construction of the feed dog drop device will be described with reference to FIGS. The feed dog drop device 50 of the present invention is an XY drive mechanism 2 for frame embroidery.
The operation of the carriage 22 of No. 8 is used to operate the flip-flop type drop lever 62 of the feed dog drop device 50 to automatically raise and lower the feed dog.

The vertical feed cam 52 of the feed control mechanism 36 (FIG. 3) is engaged with the horizontal feed shaft 56 via the adjusting plate 70, and is biased by the spring 58 in the right direction in FIG.
The vertical feed cam 52 is fitted into the lower shaft 60 as shown in FIG. 4, and is engaged with the pin 61 fixed to the lower shaft 60.
1, the force in the rotation direction is transmitted, and the force can be moved in the left and right directions in FIG. 57 is a stop ring,
It is fixed to the lower shaft 60 and one end of the spring 58 is locked.

The drop lever 62 is a bed cover 82.
The pin 76 (FIG. 6) can be rotated with respect to the pin 76 (FIG. 6).
The flange portion 53 of is engaged. The state of FIG. 4 is a state in which the feed dog is raised (hereinafter, the feed dog is up),
The cam portion 55 of the vertical feed cam 52 and the lower portion 72 of the adjusting plate 70
And are engaged. At this time, the click portion 62a of the drop lever 62, which is elastically deformable up and down, has the bed cover 82.
Is engaged with the pair of click grooves B.

When the drop lever 62 moves to the left from the state of FIG. 4 and the click portion 62a engages with the pair of click grooves C, the adjusting plate 7 is attached to the cam portion 54 of the vertical feed cam 52.
The lower part 72 of 0 is engaged, and the feed dog is lowered (hereinafter, the feed dog is in the down state).

Next, the relationship between the drop lever 62 of the feed dog drop device 50 and the carriage 22 for controlling the movement of the drop lever 62 will be described with reference to FIGS. A drop lever piece 74 is engaged with the drop lever 62, and the drop plate 23 attached to the carriage 22.
But the drop lever 6 via the drop lever top 74
2 is operated to set the state of the feed dog. The details will be described below.

The drop lever top 74 is movable along the longitudinal direction of the bed cover 82, and the pin portion 74a passes through the groove portion 82a of the bed cover 82 and projects into the bed cover 82, so that the drop lever 62 is bifurcated. Part 63
And is vertically thrust by a thrust stopper 84 (FIG. 5).

A drop plate 23 is attached to the carriage 22, and the drop plate 23 and the drop lever piece 7 are controlled by controlling the movement of the carriage 22 as described later.
4, the drop lever 62 is operated to set the state of the feed dog.

Next, the operation of the feed dog drop device will be described. 7 to 9 show the operation of the carriage 22 when moving and setting the feed dog from the up state to the down state.

The steps will be described below in order. For example, when the embroidery mode key is selected in the normal sewing state to switch to the embroidery sewing state, it is necessary to change the feed dog from the up state to the down state. The solid line state of the drop lever 62 in FIG. 7 corresponds to the up state of the feed dog.

At this time, the carriage 22 first moves from the home position A to the front of the drop lever top 74 in the left direction in the figure, and then slightly moves downward in the figure, and the drop plate 23 fixed to the carriage 22 drops. The lever piece 74 can be engaged. (Figure 8)

In this state, the carriage 22 further moves to the left and the drop lever 62 is rotated about the pin 76,
The carriage 22 is driven to the solid line state (the feed dog is in the down state) in FIG. 9, and then the carriage 22 is raised by the descending amount, moves to the right, and returns to the home position A.

The detection switch 46 includes a drop lever 62.
Is a switch for detecting the setting position of, and detects whether or not the drop lever 62 has normally moved. That is, the detection switch 46 is turned off when the drop lever 62 is in the solid line state (feed dog up state) and turned on when the drop lever 62 is in the alternate long and short dash line state (feed tooth down state) in FIG. To detect.

10 to 12 show the operation of the carriage 22 when the feed dog is set to move from the down state to the up state, contrary to the above. For example, it is necessary to return the feed dog from the down state to the up state when returning from the embroidering state to the normal sewing state. First, the carriage 22 is moved leftward from the home position A and lowered to the left side of the drop lever top 74, the drop lever top 74 is moved from left to right to a position where the feed dog is in the up state, and then lowered. The movement is increased by a minute and the movement to return to the home position A is performed again.

The example in which the state of the feed dog is set corresponding to the sewing state of the sewing machine by operating the mode selection key has been described above. However, when a pattern such as "darning" or "single stitch" is selected by the pattern selection key 16 in the normal sewing state, it is necessary to set the feed dog to the down state even in the normal sewing pattern. The feed dog is automatically set to the down state by the movement control of the carriage 22 as in the case where the embroidery mode key 6 is operated. These patterns in the normal sewing pattern are hereinafter referred to as feed dog drop command patterns.

Next, the control operation of the feed dog drop device 50 will be described with reference to the flowchart of FIG. In the figure, Sn indicates each processing step of control. When the power is turned on, the program starts, and at S1, X-
The Y drive device 20 is initially set, and the carriage 22 moves to the home position.

In S2, it is checked whether the embroidery mode selection or the feed dog down command pattern has been selected by operating the keyboard 4, and if so, the process proceeds to S10,
If not, proceed to 20.

When the process proceeds to S10, ON / OFF of the detection switch 46 for detecting the position of the feed dog is checked, and when ON (the feed dog is in a down state), the process returns to S2,
If it is OFF (the feed dog is up), the process proceeds to S11.

When the process proceeds to S20, ON / OFF of the detection switch 46 for detecting the position of the feed dog is checked, and when it is OFF (feed dog up state), the process returns to S2 and ON (feed tooth down state). In the case of, it progresses to S21.

Here, a case where the feed dog is in the up state and the embroidery mode key 6 is selected in this state will be described. Since the carriage 22 is moved to the home position A in S1 and the feed dog is in the up state, S2 and S20 are repeatedly executed before the selection operation. If the embroidery mode key 6 is selected in this state, S
Since the detection switch 46 is off in step 10, the process proceeds to step S11.

In S11, an operation command for changing the feed dog from the up state to the down state is issued. By this operation command, the carriage 22 starts operating from the home position A, and the feed dog is changed from the up state to the down state. After that, it is controlled to perform a series of operations for returning to the home position A. After completion of this operation, ON / OFF of the detection switch 46 is checked in S12, and if it is ON, the feed dog is set to the down state, and therefore the process returns to S2.

When the detection switch 46 is OFF in S12, the error count is incremented by 1 in S13, the process returns to S11 until the error count overflow is determined in S14, and the carriage 22 performs the above-described series of operations according to the operation command. Is controlled as follows.
If it is determined to be ON, the process returns to S2.

If the error count overflow is determined in S14 without determining the ON state of the detection switch 46 in S12 by repeating the loop of S11 to S14, the process proceeds to S15 and "manually" is displayed on the display device 10. Please operate. ”Is displayed.

According to this instruction display, the user of the sewing machine can manually move the drop lever 62 to move the drop lever 62 leftward in FIG.
It is possible to avoid inconveniences in the embroidery mode and the like, which require the feed dog to be down.

Next, a case where the feed dog is in the down state and the normal sewing mode key is selected in this state will be described. When the normal sewing mode key is selected, S2
From S to S20, since the detection switch 46 is ON, S21 is performed.

In S21, an operation command for changing the feed dog from the down state to the up state is issued, and by this operation command, the carriage 22 starts operating from the home position A, and the feed tooth is changed from the down state to the up state. After that, it is controlled to perform a series of operations for returning to the home position A. After this operation is completed, ON / OFF of the detection switch 46 is checked in S22, and if it is OFF, the feed dog is set to the up state, so S2
Return to.

If the detection switch 46 is ON in S22, the error count is incremented by 1 in S23, the process returns to S21 until the error count overflow is determined in S24, and the carriage 22 performs the above-described series of operations according to the operation command. Is controlled as follows.
If it is determined to be OFF, the process returns to S2.

The loop of S21 to S24 is repeated, and it is not determined that the detection switch 46 is OFF in S22.
If it is determined in 24 that the error count overflows, the process proceeds to S25, and an instruction display saying "please operate manually" is displayed on the display device 10.

By this instruction display, the user of the sewing machine can manually move the drop lever 62 to move the drop lever 62 rightward in FIG.
It is possible to avoid the inconvenience in the normal sewing mode that requires the feed dog to be up.

[0044]

As described above, according to the present invention, the sewing condition of the sewing machine selected by the user or the condition of the feed dog necessary for the sewing pattern is automatically set in accordance with the selected pattern. Usability is improved.

[Brief description of 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 perspective view showing a feeding mechanism of the sewing machine.

4 is a view of the feed dog drop device corresponding to the arrow D in FIG. 4.

FIG. 5 is a diagram showing a relationship between a carriage and a drop lever.

FIG. 6 is a view on arrow E of FIG. 5 showing the relationship between the carriage and the drop lever.

FIG. 7 is a diagram for explaining the operation of the feed dog drop device.

FIG. 8 is a view for explaining the operation of the feed dog drop device.

FIG. 9 is a view for explaining the operation of the feed dog drop device.

FIG. 10 is a view for explaining the operation of the feed dog drop device.

FIG. 11 is a view for explaining the operation of the feed dog drop device.

FIG. 12 is a view for explaining the operation of the feed dog drop device.

FIG. 13 is a control block diagram of the sewing machine.

FIG. 14 is a control flowchart of the feed dog drop device.

[Explanation of symbols]

 6 Embroidery mode key 8 Normal sewing mode key 10 Display device 16 Pattern selection means 28 XY drive mechanism 50 Feed dog drop device

Claims (3)

[Claims] 1. A sewing machine capable of forming a desired pattern stitch by selectively switching between normal stitching and frame stitching, and an XY for stitching when selecting the stitching stitch.
An automatic feed dog drop device for a sewing machine, characterized in that the feed dog drop device is actuated by movement control of a drive mechanism to set the feed dog in a down state. 2. A sewing machine capable of forming desired pattern stitches by selectively switching between normal stitching and frame stitching, and an XY drive mechanism for stitching when switching from the stitching to the normal stitching. An automatic feed dog drop device for a sewing machine, wherein the feed dog drop device is operated by movement control to set the feed dog from a down state to an up state. 3. A sewing machine capable of forming a desired pattern stitch by selectively switching between normal stitching and frame stitching, and an XY drive for embroidery stitching when the feed tooth down command pattern of the normal stitching is selected. An automatic feed dog drop device for a sewing machine, characterized in that the feed dog drop device is operated by movement control of the mechanism to set the feed dog in a down state.