JPH01305989A - Feed lifting sewing machine - Google Patents

Abstract

PURPOSE:To accurately restrict a working amount of up and down adjusters, in case of decreasing up and down feed amounts, by controlling a changing mechanism to be previously actuated to a position, where a change member engages with an up or down working member, being based on a detecting data of the feed amount of the up or down feed adjuster thereafter controlling the changing mechanism to be actuated to the finally decreasing or inverting position. CONSTITUTION:When a decreasing or inverting signal is supplied to a CPU95 from an operating member 105 halfway the sewing operation, a servo solenoid 89 is again driven further turning a change member 86, and being based on detection of a down feed amount by a potentiometer 34, when up and down feed adjusters are turned and arranged in a predetermined decreasing or inverting position, the servo solenoid 89 is stopped. Thereafter when a foot pedal 98 is opened, a stop signal is output to a sewing machine motor 5 from the CPU95. Successively when the foot pedal 98 applies a back step-in, the CPU95 outputs a driving signal to a solenoid 104 cutting a sewing thread by a thread cutting mechanism, and the sewing operation is finished.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vertical feed sewing machine equipped with an upper feed mechanism including an upper feed dog and a lower feed mechanism including a lower feed dog.

[Prior Art] A conventional vertical feed sewing machine of this type has an upper feed adjustment mechanism having an upper feed adjuster for adjusting the upper feed amount, and a lower feed adjustment mechanism having a lower feed adjuster for adjusting the lower feed amount. A feed adjustment mechanism and a changing mechanism having changing members that engageably oppose the lower actuating member linked to the upper feed adjuster and the lower actuating member linked to the lower feed adjuster, respectively, are provided, Based on the actuation of the top, the upper and lower feed adjusters are actuated from a predetermined feed rate setting state through engagement of the changing member and the upper and lower actuating members, so that the vertical feed rate is reduced or reversed. It is configured.

[Problems to be Solved by the Invention] However, generally the lower feed amount by the lower feed adjuster and the lower feed amount by the lower feed adjuster are set separately, and during normal sewing operation, the lower actuating member and the lower actuating member are changed. They are arranged facing each other at different intervals with respect to the members. To this end, when the upper and lower feed adjusters are operated from a predetermined feed amount setting state to a reduced or reversed state through the engagement of the changing member and the upper and lower actuating members with the operation of the changing a ellipse, In this case, the load on the changing mechanism changes from a no-load state to a small load state in which the upper or lower feed adjuster is actuated through engagement between the changing member and the upper or lower actuating member, and then the change mechanism changes from a no-load state to a small load state in which the upper or lower feed adjuster is actuated through engagement between the changing member and the upper or lower actuating member. There have been problems in that both the upper and lower feed adjusters are operated through engagement with the actuating member, causing large fluctuations such as in a heavy load state, resulting in poor responsiveness and noise.

In addition, especially when reducing the feed amount, the operation 1 of the upper and lower feed regulators must be regulated at a predetermined reduction position, but in the conventional configuration described above, the load fluctuates greatly.
There was also the problem that it was very difficult to regulate the amount of operation of both feed regulators, and that they were likely to overrun from a predetermined contracted position.

This invention has been made by focusing on the problems existing in the conventional technology, and its purpose is to reduce or reverse the vertical feed amount using a changing mechanism. By suppressing such load fluctuations, it is possible to improve responsiveness and reduce noise. Especially when reducing the vertical feed amount, it is possible to accurately regulate the operating amount of the upper and lower feed regulators. The objective is to provide a vertical feed sewing machine that can perform

[Means for Solving the Problems] In order to achieve the above object, the vertical feed sewing machine of the present invention includes a bottom feed adjustment mechanism having a bottom feed adjuster for adjusting the bottom feed amount, and a bottom feed amount. a lower feed adjustment mechanism having a lower feed adjuster for adjusting the lower feed amount; a lower actuating member linked to the lower feed adjuster and a lower feed adjuster linked to the lower feed adjuster for reducing or reversing the vertical feed amount; a modified i-ellipse having changing members that respectively engageably face the actuating member; a detecting means for detecting the lower feed adjuster or the feed adjustment amount of the lower feed adjuster; and based on the detection data of the detecting means, the A control means is provided for controlling the changing mechanism in advance to a position where the changing member engages with the upper or lower actuating member, and then controlling the changing mechanism to the final contracting or reversing position.

[Function] In the vertical feed sewing machine configured as described above, when the vertical feed amount is reduced or reversed by the changing mechanism,
Based on the detected data of the feed amount of the upper or lower feed adjuster, the change i ellipse is in the actuated state in advance until the change member engages with the upper or lower actuating member, and then the reduction or reversal signal is generated. Based on this, the modification mechanism is actuated to the final contracted or reversed position.

[Embodiment 1] Hereinafter, an embodiment of a vertical feed sewing machine embodying the present invention will be described based on the drawings.

As shown in FIG. 1, a sewing machine main shaft 4 supported within an arm portion 2 of a sewing machine main body 1 is rotated by a sewing machine motor 5 shown in FIG. 7 via a belt 6 and a pulley 7. Accordingly, the needle bar 8 shown in FIG. Seams are formed on the upper and lower two work cloths Wl and W2.

Further, a known thread cutting mechanism (not shown) for cutting the sewing thread is disposed within the bed portion 3.

Next, the upper work cloth W2 is engaged with the lower surface of the upper work cloth W2.
The downward feed tllmll for giving feed to is configured as follows.

One eccentric cam for vertical feeding is fixed to the main shaft 4 of the sewing machine, and when the eccentric cam 19 for vertical feeding is rotated as the main shaft 4 of the sewing machine rotates, the sewing machine main shaft 4 is connected to the bed via the crank rod 20 and the connecting arm 21. A vertical feed shaft 13 in the section 3 is reciprocated within a predetermined range.On the other hand, an eccentric cam 18 for horizontal feed is fixed to the main shaft 4 of the sewing machine.
When the horizontal feed eccentric cam 18 is rotated in accordance with the rotation of the horizontal feed shaft 18, the horizontal feed shaft in the bed portion 3 is adjusted via the crank rod 23 and the lower feed adjuster 22 according to the rotational adjustment of the lower feed adjuster 22. 12 is reciprocated within a predetermined range. and,
As the horizontal feed shaft 12 and the vertical feed shaft 13 reciprocate, the lower feed dog 16 operatively connected to each feed shaft 12.13 is moved to feed, and the upper workpiece cloth W2 is fed from below. be done.

Next, a lower feed adjustment mechanism 25 including the lower feed adjuster 22 and for adjusting the lower feed amount of the lower feed dog 16 is configured as follows. As shown in Figures 3 and 4,
Lower feed adjustment member 2 in which a diagonal feed control cam 27 is formed
6 is rotatably provided within the arm portion 2 of the sewing machine body 1, and is biased to rotate clockwise in FIG. 4 by the action of a spring 28. One end of the lower feed adjustment member 26 is connected to a connecting rod 32.
It is connected to a first arm portion 31a of a tri-arm-shaped inoperative member 31 that is rotatably supported by an operating shaft 30 that is rotatably supported within the arm portion 2. The second arm portion 31b of the inoperative member 31 is connected to the lower feed adjuster 22 via a connecting rod 33. When the manual operation member 29 screwed onto the front part of the arm part 2 is rotated, the two members are moved in the front and rear direction, resisting the action of the spring 28 and engaging the control cam 27. The inclination angle of the lower feed adjustment member 26 is changed through engagement of the tip of the manual operation member 29. This lick, connecting rod 32, non-operating member 3
1 and the connecting rod 33, the lower feed adjuster 22 is rotationally adjusted, and the lower feed amount of the lower feed dog 16 is changed.

A potentiometer 34 serving as a detection means is connected to a pin 36 provided on the third arm portion 31c of the non-operating member 31, and the potentiometer 34 is connected to a pin 36 provided on the third arm portion 31c of the non-operating member 31. , a detection signal of the downward feed adjustment amount is output from the potentiometer 34.

Next, the upper feed mechanism 41 is configured as follows in order to feed the upper work cloth W1.

As shown in FIG. 2, the presser bar 42 has a workpiece cloth W at its lower end.
A presser foot 43 for pressing L and W2 onto the bed portion 3
have. The upper feed dog mount 46 is supported by a support member 44 fixed to the presser bar 42 so as to be movable in the front and rear direction, and has an upper feed dog 49 attached to its lower end. 11
The vertical feed lever 50, which has an L-shape of the 1I surface type, is slidably fitted onto the upper feed dog mounting base 46 and is swingably supported by the support shaft 45 on the support member 44. There is.

When the eccentric cam 64 fixed to the sewing machine main shaft 4 is rotated with the rotation of the sewing machine main shaft 4, the swing shaft 51 in the arm portion 2 is rotated through the crank rod 65, the link 66, and the connecting arm 67. It is oscillated back and forth within a predetermined range.

On the other hand, a vertical feeding center cam 6 fixed to the sewing machine main shaft 4
8, the crank rod 69 and the connecting arm 7
The actuating shaft 52 within the arm portion 2 is reciprocated within a predetermined range via the arm portion 2. The reciprocating swing of the swing shaft 51 causes the upper feed dog mount 46 to reciprocate back and forth via the two-pronged lever 59, swing lever 57, swing shaft 53, swing arm 54, link 55, and pin 56. At the same time, due to the reciprocating swing of the operating shaft 52, the upper feed dog mount 46 swings up and down via the connecting arm 63, the connecting lever 62, the rotation lever 60, the engagement pin 61, and the vertical feed lever 50. Then, the upper feed dog 49 is moved to feed the upper work cloth W1 from above.

Next, the upper feed adjustment mechanism 71 for adjusting the upper feed amount of the upper feed dog 49 is configured as follows. As shown in FIGS. 1 and 5, the adjustment shaft 7 in the arm portion 2
2 and connected to one end of the link 66, the upper feed adjuster 73 is always set at a predetermined rotational position, and the angle between its center line L-L and the reference line M-M is The larger the size, the larger the horizontal movement of the link 66 is allowed, the larger the swing amount of the swing shaft 51, and the larger the upper feed amount of the upper feed tooth A9.

As shown in FIG. 3 and FIG.
4, and is urged to rotate clockwise in FIG. 4 by the action of a spring (not shown). The lower actuating member 80 faces the lower actuating member 31 at a predetermined distance,
It is supported by the operating shaft 30 so as to be relatively rotatable, and its tip is connected to the upper feed adjustment member 77 via a connecting rod 81.

When the manual operation member 79 screwed onto the front part of the arm section 2 is rotated, the member 79 is moved in the front-back direction, and the inclination angle of the upper feed adjustment member 76 is changed. . For this reason, the upper feed adjuster 7
3 is rotated, the upper feed amount of the upper feed dog 49 is changed, and the lower actuating member 80 is placed at a predetermined rotation position via the connecting rod 81.

Next, the changing mechanism 85 that reduces or reverses the lower feed amount of the lower feed dog 16 and the upper feed amount of the upper feed dog 49 will be described. As shown in FIGS. 3 to 6, a two-armed changing member 86 is fixed to the actuating shaft 30 between the lower and lower actuating members 31.80, and the actuating pin 3 on each actuating member 31.80.
1a and 80a so as to be engageable with each other. The reversing operation lever 87 is fixed to the end of the operating shaft 30, and is normally biased and held at the original position together with the changing member 86 by the action of a coil spring 88.

The servo solenoid 89 supports on its output shaft 90 an operating lever 91 that can be engaged with the reversing operation lever 87 . Then, when the output shafts 90 of the eight servo solenoids are actuated by a predetermined amount in response to a reduction in the vertical feed amount or generation of a reversal signal, the changing member 86 is activated via the actuating lever 91, the reversing operation lever 87, and the actuating shaft 30. The operating pins 31a, 80 are rotated clockwise from the original position shown in FIG. 6(a).
The lower and lower actuating members 31.80 are rotated via a,
The lower and upper feed adjusters 22.73 are pivoted to the reduced or reversed position.

Next, the control circuit of the vertical feed sewing machine configured as described above will be explained. As shown in FIG.
The OM) 96 stores programs for controlling the overall operation of the sewing machine, and the memory (RAM) 97 temporarily stores the results of calculations. The CPU 95 includes the potentiometer 34, a foot pedal 98 for generating start/stop signals and thread trimming signals for the sewing machine, reversal of feed,
An operating member 105 that generates a reduction signal is connected via an input interface 99 .

The CPU 95 also includes the servo solenoid 89. “The sewing machine motor 5 and a thread trimming solenoid 104 for driving the thread trimming mechanism are connected via an output interface 100 and drive circuits 101, 102, and 103.

Then, at the beginning of sewing the work cloth, the CPU 95 outputs a drive signal to the servo solenoid 89 based on the lower feed amount detection data of the lower feed adjuster 22 detected by the potentiometer 34, as shown in FIG. 6(b). As shown in , the changing member 86 is rotated in advance to a position where it engages with the operating pin 31a of the lower operating member 31, and then, when a reduction or reversal signal is generated, a drive signal is outputted to the servo solenoid 89 again. Then, as shown in FIG. 6(C), the changing member 86 is rotated to the final contracted or reversed position.

Next, the operation of the vertical feed sewing machine constructed as described above will be explained with reference to the flowchart shown in FIG. (Note that a step is simply represented by S.) Now, in this vertical feed sewing machine, when the power is turned on, a drive signal is output from the CPU 95 to the servo solenoid 89, and the changing member 8
6 is rotated clockwise from the original position shown in FIG. 6(a) and a change in the downward feed amount is detected by the potentiometer 34, that is, as shown in FIG. 6(b), the changing member 86 is rotated to a position where it engages with the operating pin 31a on the lower operating member 31, a stop signal is output from the CPU 95 to the servo solenoid 89, and the servo solenoid 89 is stopped in this state (81-S3).

Thereafter, the work cloth W1 is placed on the bed portion 2 of the sewing machine body 1. W
2 is set, and when the foot pedal 98 is pressed forward, a drive signal is output from the CPU 95 to the sewing machine motor 5, and the sewing machine is started (34. S5).

Then, during the sewing operation, the CPU 9 is
When a reduction or inversion signal is supplied to 5, the servo solenoid 89 is driven again, and the changing member 86 is further rotated as shown in FIG. , lower and upper feed regulators 22.
When 73 is rotated to a predetermined contracted position or reversed position, the servo solenoid 89 is stopped (86 to S9).
.

Thereafter, when the foot pedal 98 is released, a stop signal is output from the CPU 95 to the sewing machine motor 5 (SIO, 5l
l). Next, when the foot pedal 98 is depressed backward, a drive signal is output from the CPU 95 to the thread trimming solenoid 104, the thread is cut by the thread trimming mechanism, and the sewing ends (S12.313), and the next sewing starts. Therefore, the process returns to 81 and the servo solenoid 89 is driven and controlled.

Further, when the foot pedal 98 is not released at 810 and is not stepped backward at 312, the process returns to S4.

As described above, in the vertical feed sewing machine of this embodiment, when starting to sew the workpiece cloth, the servo solenoid 89 is driven based on the detection data of the downward feed amount detected by the potentiometer 34, and the changing member 86 is moved downward. The actuating member 31 is pre-rotated to a position where it engages with the actuating pin 31a, and then, when a retraction or reversal signal is generated, the servo solenoid 89 is driven again and the changing member 86 is rotated to the final retraction or reversal position. The lower and upper feed adjusters 22.73 are rotated from the predetermined feed position to the reduced or reversed position. Therefore, when the vertical feed amount is reduced or reversed, unlike the conventional device described above, there is no load change from no load to small load.
The load applied to 85 does not fluctuate greatly, and responsiveness can be improved and noise can be reduced. Furthermore, since the load fluctuation is small as described above, especially when reducing the vertical feed amount, the lower and upper feed adjusters 22.73 accurately follow the control of the servo solenoid 89, and the lower and upper feed adjusters 22.73 accurately follow the control of the servo solenoid 89. 73 can be precisely regulated and arranged without overrunning the predetermined reduced position.

Note that the present invention is not limited to the configuration of the embodiment described above, and for example, the upper feed amount of the upper feed adjuster may be detected using a potentiometer, or the feed amount of both upper and lower feed adjusters may be configured using a potentiometer. It may be configured to detect.

Further, in this embodiment, in order to engage the changing member 86 with the lower actuating member 31 in advance, eight servo solenoids are driven and controlled after power is turned on and after thread trimming. It is sufficient that the drive control is performed before the reversing operation is performed; for example, the drive control may be performed after the foot pedal 98 is depressed forward.

[Effects of the Invention] Since this invention is configured as explained above,
When reducing or reversing the vertical feed amount using the changing mechanism,
By suppressing fluctuations in the load applied to the changing mechanism, it is possible to improve responsiveness and reduce noise.Especially when reducing the vertical feed amount, the operating amount of the upper and lower feed adjusters It has the excellent effect of being able to accurately regulate the

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing the upper and lower feed mechanisms in a vertical feed sewing machine embodying the present invention, Fig. 2 is a partial cross-sectional view of the upper feed mechanism, and Fig. 3 is an upper feed adjustment mechanism and a lower feed adjustment mechanism. A perspective view showing the mechanism and the modified V&S. Fig. 4 is a sectional view of the upper and lower feed adjustment i ellipses. Fig. 5 is a partial enlarged sectional view of the upper feed adjustment a mechanism. Figs. 6 (a) to 6. (C) is a partial sectional view showing the state of engagement with the actuation pin as the changing member rotates;
FIG. 7 is a block diagram showing the control circuit, and FIG. 8 is a flow chart for explaining the operation. 11... Lower feed mechanism, 16... Lower feed dog, 22...
・Lower feed adjuster, 25...Lower feed adjustment mechanism, 31...
- Lower operating member, 31a... Operating pin, 34... Potentiometer as detection means, 41... Upper feed am
, 49... Upper feed dog, 71... Upper feed adjustment mechanism, 7
3...-Upper feed adjuster, 80...Lower operating member, 80a
. . . Actuation pin, 85 . . . Change a mechanism, 86 . . . Change member, 89 . Patent applicant Brother Industries, Ltd. Agent
Patent Attorney On 1) Hironobu Figure 2 315F! lJ Figure 6(a) 0a

Claims (1)

[Claims] 1. In a vertical feed sewing machine equipped with an upper feed mechanism (41) including an upper feed dog (49) and a lower feed mechanism (11) including a lower feed dog (16), an upper feed amount: an upper feed adjustment mechanism (71) having an upper feed adjuster (73) for adjusting the lower feed amount; a lower feed adjustment mechanism (25) having a lower feed adjuster (22) for adjusting the lower feed amount; In order to reduce or reverse the feed amount, the upper actuating member (80) is connected to the upper feed adjuster (73) and the lower actuating member (31) is connected to the lower feed adjuster (22), respectively. a changing mechanism (85) having changing members (86) that are capable of facing each other; and a detecting means (34) for detecting a feed adjustment amount of at least one of the upper feed adjuster (73) and the lower feed adjuster (22). Based on the detection data of the detection means (34), the changing mechanism (85) is previously controlled to a position where the changing member (86) engages with the upper or lower actuating member (80, 31), and then the final A vertical feed sewing machine characterized by comprising: a control means (95) for controlling the operation of the changing mechanism (85) to a desired reduction or reversal position.