JPS6025148B2 - Cycle sewing machine control device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a control device for a cycle sewing machine such as a button sewing machine or a cross-tack sewing machine, and in particular, the invention relates to a control device for a cycle sewing machine such as a button sewing machine or a cross-tack sewing machine. The present invention relates to a control device that is capable of switching between two stages: a control system that performs two cycle sewing operations, and a control system that performs two cycle sewing operations by repeating the same cycle sewing process at the same time that the sewing machine stops upon completion of one cycle sewing process. When applied to a button sewing machine, if the control method is changed to perform the same cycle of sewing twice, and the operation is performed to sew a four-hole button onto clothing, it is possible to sew as shown in Figure A in Figure 4. To obtain a control device which can perform sewing as shown in Fig. 4B by switching to a control system that performs cycle sewing only once and operating the sewing machine to sew a two-hole button onto clothing. The purpose is to

An embodiment of the present invention will be explained with reference to the drawings. The sewing machine 1 shown in Figs. 1 and 2 is connected to a driving part (not shown) as shown in, for example, Japanese Patent Publication No. 35-12538, so that it always rotates idly. The rotation of the pulley 2 is transmitted to the main shaft 5 of the sewing machine by rotating the control lever 3 in the clockwise direction in FIG. A mechanism for forming a single-thread chain stitch using the needle 7 of the needle bar 6, which moves up and down once in conjunction with rotation, and the looper 8, which rotates in conjunction with the main shaft 5, as shown by the two-dot chain line in FIG. Furthermore, as shown in Japanese Patent Publication No. 35-7943, there is an interlocking shaft 9 that moves with the rotation of the main shaft 5 and makes one rotation at a fixed ratio, for example, for every 16 revolutions of the main shaft 5 (FIG. 2).
This button sewing machine is equipped with a mechanism (not shown) that swings a holding mechanism 10, which holds cloth and a button with a hole, back and forth, left and right, using two cams (not shown) provided in the button.

The holding mechanism 1 is provided with a movable plate 11 that slides on the upper surface of the base portion 12 of the sewing machine 1 in conjunction with the swinging mechanism, and this movable plate 11 is attached to the back and forth movement direction of the holding mechanism 10 (horizontal direction in FIG. 2). One end of the holding plate 14 is rotatably supported by a shaft 13 that intersects with the sewing machine jaw 15, and a pair of holding arms 16 are provided at the other end extending substantially downward of the sewing machine jaw 15 for holding the button on the path of the needle 7. , 16' are each supported in an openable and closable manner.
Further, the upper surface of the retaining plate 14 is connected to the lower surface of the head of the sewing machine 1, so that the retaining arms 16, 16' of the retaining plate 14 are attached to the movable plate 11.
In other words, the second ball is pressed against the upper surface, centering on the ball 13.
A pressing mechanism 17 that applies an acting force in the clockwise direction in the figure is arranged,
Furthermore, a transmission punch 18 having an almost inverted L shape is installed, with its free end being the jaw 1.
6 Install so that it protrudes downward. As shown in FIG. 2, an eccentric cam 19 is fixed to the main shaft 5, and a shaft 20 supported on the frame of a sewing machine extends almost horizontally with a fork 21 that holds the eccentric cam 19 and has a tip end. Actuating part 22 bent at right angle
A rocking body 23 having a shape formed therein is rockably supported.

This oscillating body 23 oscillates around the ratchet 20 due to the rotation of the eccentric cam 19 caused by the rotation of the main shaft 5, and its operating portion 22 reciprocates substantially in the vertical direction. Further, a disk 26 having recesses 24 and 25 formed on the outer circumferential surface opposite to each other across the ball center of the movement shaft 9 is fixed to the interlocking shaft 9 extending parallel to the main shaft 5 on the left side of the main shaft 5. One end of the actuating lever 27 is fixed to the support shaft 4 which extends in parallel with the spindle 5 and the interlocking gill 9 and applies rotational force in the clockwise direction in FIG. 2 (counterclockwise in FIG. 1), and the other end is A roller 28 is rotatably installed to press against the outer peripheral surface of the disc 26 by the rotational force of the support shaft 4. On the other hand, inside the head of the sewing machine 1 is a fixed shaft 29 supported on the machine frame.
The intermediate portion of the swing link 30 is swingably supported, and a horizontal portion at one end of the swing link 30 extending in the jaw direction intersects or enters below the transmission village 18 installed in the holding mechanism 10.
The vertical end of the Egami village 31 of the shape is fixed, and the upper end of the upper and lower punches 32 is swingably connected to the end of the swing link 30 extending to the rear part of the sewing machine 1. Further, one end of the connecting village 33 is fixed to the support shaft 4, and the other end extending downward and the lower ends of the upper and lower punches 32 are rotatably connected by connecting links 34, respectively. As will be described in detail later, the lower ends of the upper and lower punches 32 are provided with an actuating portion 22 which is used when the rocking body 23 swings when the rollers 28 of the actuating lever 27 are carried into the respective recesses 24 and 25 of the disk 26. When the actuating part 22 moves downward, the actuating part 212 engages with the actuating part 212 to form an engagement groove 35 for moving the vertical village 32 downward. This engagement groove 35 is connected to the interlocking groove 33 by the counterclockwise rotation of the support shaft 4.
As a result of the swinging in the direction of the rebound gauge, the upper and lower punches 32 are swung counterclockwise through the connecting link 34 around the connection point with the swinging link 30, and the vertical punch 32 is moved out of the vertical movement path of the operating section 22. Exit to.

A support piece 36 is fixed within the head support of the sewing machine 1, and an L-shaped circular link 38 is rotatably supported by a step screw 37, with one end extending approximately horizontally and the other end of the swinging link 30. are rotatably connected to each other by a connecting link 39, and the other end of the rotary link 38 extending downward into the base portion 12 has a rotary link 38 that slides in the horizontal direction (left-right direction in FIG. 2) within the base portion 12. One end of the operating link 40 supported in the sewing machine is connected so that it can be rolled around, and the other end of the operating link 40 extending toward the front of the sewing machine is connected to the lower surface of the upper plate 41 of the base portion 12.
One stem of the needle thread loop is rotatably supported near a needle hole (not shown) provided in the needle hole, and is captured by the looper 8 by rotating in one direction, crossing the path of the needle 7 passing through the needle hole. A movable scalpel 59 is disposed that cuts the needle 7 in cooperation with a fixed knife (not shown) disposed opposite to the path of the needle 7. As shown in FIGS. 2 and 3, a support piece 42 having a horizontally extending support portion 42a and a vertically extending support portion 42b is provided at the lower end of the sewing machine jaw 15. (FIG. 2), and the end of the support portion 42a when viewed from the front of the sewing machine (FIG. 3) is to the left of the path of the needle 7 (double-dashed line x in FIG. 3),
The base portion 42c of the support portion 42b is located on the right side, and one end is formed long at the end of the support portion 42a, and the tip thereof is bent at a substantially right angle 48 so as to intersect the path of the needle 7. A transmission link 46 rotatably supports a shaped wiper piece 43 by a step screw 44, and has a guide hole 45 formed at the end of the support portion 42b to play the free end of the transmission village 18 installed on the retaining plate 14. One end of the transmission link 46 is rotatably supported, and the end of the transmission link 46 and the other end of the wiper piece 43 are rotatably connected by a connecting piece 47, respectively.

This wiper piece 43 is moved at two points in FIG. When the transmission punch 18 is raised via the Egami punch 31 due to the swinging of the swing link 30 as will be described later, that is, when the holding plate 14 is raised from the movable plate 11, the transmission link 46 and the connecting piece 47 are at the position indicated by the chain line. is rotated clockwise in FIG. 3 about the stepped screw 44 and moved to the solid line position, so that the bent portion 48 crosses the path of the needle 7. Further, as shown in FIG. 5, the wiper piece 43
A holding hole 49 is formed in the bent portion 48 of the wiper piece 43 so that the holding hole 49 intersects with the direction of movement of the bent portion 48 (arrow A) due to the above-mentioned rotation of the wiper piece 43. An entry port 50 for the needle thread T, which fits into the self-retaining hole 49, is formed at a position away from the path Y of the needle thread T (front in FIG. 5) on the engagement surface, that is, on the left side in FIG. , and a guide surface 61 that guides the needle thread T from the vicinity of the intersection with the path Y to the entrance 501.
is formed by sloping inward. An actuating piece 52 is fixed to the other end of the swinging link 30, and as described later, when the swinging link 30 is rotated counterclockwise about the fixed shaft 29, the operating piece 52 opens or opens the contact. A closed control switch 53 is installed in the sewing machine head. This control switch 53 is connected to an electric control circuit to be described later. As shown in FIG. 1, a control disk 54 is fixed to the main shaft 5, and the control lever 3 engages with a locking step (not shown) provided on the outer periphery of the disk 54 to control the rotation of the main shaft 5. A locking piece 55 that stops (the state shown in FIG. 1) is provided. When the main shaft 5 is stopped by the engagement of the locking piece 55 with the locking stepped portion of the control disk 54, the needle bar 6 is stopped at the top dead center of its vertical movement.

Further, the control lever 3 is provided with a control piece 56 that protrudes downward, and a plunger 58 that protrudes by excitation of a magnet 57 is attached to the control piece 56 at an appropriate position on the sewing machine table (not shown) or the machine frame of the sewing machine I. Install it so that it joins. Then, when the plunger 58 protrudes due to the excitation of the magnet 57 and presses the control piece 56, the bar 3 is rotated clockwise (FIG. 1) against the acting force of the support 4.
Therefore, the engagement between the locking piece 55 and the stepped portion of the disk 54 is disengaged, and the rotation of the pulley 2 is transmitted to the main shaft 5 as described above, and the sewing machine 1 is driven. Therefore, the functions of each part when the sewing machine is driven and stopped will be explained. The clockwise rotation of the control lever 3 causes the operating lever 27 to rotate in the counterclockwise direction in FIG. rotates, and in conjunction with this, stitch formation is performed by the needle 7 and the looper 8. Also, the work cloth such as clothing is held between the holding arms 16, 16' and the movable plate 11, and the holding arms 16, 16'16'
In between, a holding mechanism 10 that holds a two-hole button or a four-hole button to be sewn onto the work cloth moves back and forth and left and right. The disc 26 rotates in the direction of the arrow due to the rotation of the interlocking shaft 9 that moves with the main shaft 5, and even if the rotation operation of the control lever 3 (excitation of the magnet 57 or the operator's pedal depression operation) is subsequently released, the above-mentioned Since the roller 28 is engaged with the outer peripheral surface of the disk 26 and the rotational operation state of the control lever 3 is maintained, stitch formation continues. The stitch formation order is as shown in FIG. 4, and when the stitching is completed up to the 8th stitch, the disk 26 rotates half a turn and the roller 28 of the actuating lever 27 enters the recess 25 due to the rotational force of the spindle 4. As a result, the control lever 3 rotates around the support shaft 4 in all directions as shown in FIG. control disk 54
(at this time, the main shaft 5 is rotating due to its inertia).

Further, due to the rotation of the support shaft 4, the upper and lower villages 32 are swung clockwise (FIG. 2) about the connection point with the swinging link 30 via the connecting village 33 and the connecting link 34, and the upper and lower villages 32 are swung clockwise (Fig. As described above, the guide 35 enters the vertical movement path of the actuating part 22 of the rocking body 23, and when the actuating part 22 moves downward, the actuating part 2
2 engages with the engagement groove 35 and is pushed down, whereby the upper and lower punches 32 are pushed down. At this time, the locking piece 56 of the control lever 3 and the locking stepped portion of the control disc 54 are engaged to prevent the control disc 54 from rotating, and therefore the inertial rotation of the main shaft 5 is stopped. Therefore, the swinging of the swinging body 23 stops, and the operating part 22 stops in a state where the vertical member 32 is pushed down, and the swinging link 30 rebounds around the fixed shaft 29 by pushing down the upper and lower members 32. The connecting link 39 rotates counterclockwise in FIG. 2 around the stepped screw 37, the operating link 40 moves to the right in FIG. 2, and the movable knife 59 rotates. As described above, above the looper 8, which is stopped with the needle thread loop wrapped around its tip, one trunk of the needle thread loop is captured, and the needle thread is removed by a cooperative action with the fixed knife. Cut the loop. Almost at the same time as this cutting of the needle thread loop, the swinging link 30 causes the holding plate 14 to move into the second position around the shaft 13 through the Egami Yoshi 31 and the transmission village 18 against the action of the pressing mechanism.
By rotating counterclockwise in the figure, the holding arms 16, 16' rise from the movable plate 11. At this time, the button is raised together with the sewn fabric while being held by the holding arms 16, 16'. Alternatively, the transmission link 46 that connects the free end of the transmission punch 18 with the transmission punch 18 by Uemura 31 rotates clockwise in FIG. 3 about the connection point with the support portion 42b of the support piece 42. , the wiper piece 43 rotates clockwise around the step screw 44 via the connecting piece 47, and the tip bent portion 48 rotates into the third
Move from the position indicated by the two-dot chain line to the position indicated by the solid line in the figure, and engage the needle thread T that is connected to the button and the fabric from the needle 7 of the needle thread loop cut below the fabric, and thread that needle thread T. The cut end is held in the holding hole 49 of the bending part 48 and pulled out to the top surface of the button and cloth. The state in which the bent portion 48 of the wiper piece 43 holds the needle thread and pulls out the cut end onto the button and the upper surface of the cloth is explained in more detail with reference to FIG. When the left side surface of the bent portion 43 engages the needle thread T, the needle thread T is guided by the guide surface 51 to the entry port 50' T2 and enters the holding hole 49 T3, and further the needle thread T is restored. The cut end is guided T4 in the direction away from the entry port 50 by the force and the inclined inner end surface of the holding hole 49, and the cut end is pulled out onto the button and the upper surface of the cloth.Then, the inertia generated when the rotation of the wiper piece 43 stops. Phenomena such as the needle thread end springing up in the direction of rotation occur due to the force, but because the needle thread T is held at a position away from the entrance 50 of the bending portion 48 as described above, Then, the above phenomenon is prevented by the left end surface of the holding hole 49, and as shown in FIG. 7A, the wiper piece 43 holds the needle thread T in its holding hole 49 and stops.

Further, by the swinging of the swinging link 30, the contacts of the control switch 53 installed in the sewing machine head are closed or released by the operating piece 52, and the electric control circuit shown in FIG. When the button is ready to be sewn, the magnet 57 is activated again in connection with the closing or opening of the contact of the control switch 53 to drive the sewing machine to start the same cycle sewing, and the fourth button is sewn. Suturing is performed between the two holes in the lower row of four holes shown in the figure (from the 9th stitch to the 1st stitch). Further, when the electric control circuit is in a preparation state for sewing a two-hole button, the sewing machine 1 is not driven regardless of the control switch 53. Therefore, the above-mentioned electric control circuit will be explained with reference to Fig. 9. In the figure, TR is a transistor, and when a base current flows, it becomes ○N and the circuit connected to it becomes energized.

The SCR is a thyristor, and when current flows through its gate, it turns on and the circuit connected to it turns on, and even if current no longer flows through the gate, it maintains the above-mentioned energized state. C
is a capacitor, SWI is a manual switch whose contacts open or close when the pedal (not shown) of sewing machine 1 is depressed, SW2 is a control switch 53 installed in the sewing machine head, and SW3 is a button type (two types). A changeover switch that can be used in two locations with a hole (hole, four holes),
M is a magnet 57. First, when the power is turned on (at this time, the motor (not shown) for driving the sewing machine 1 is driven and the pulley 2 idles), the manual switch SWI and the control switch SW2 are in a state where the contact points are solid lines. , TRI is ○N and no current flows through the control switches SW2 and SW53, so the magnet M5
7 is inactive. Then, if you operate the changeover switch SW3 to the solid line position, which is the state in which a four-hole button is sewn, and perform a starting operation by depressing the sewing machine pedal, etc.,
The handheld switch SWI is in the state shown by the two-dot chain line, TR4 and TR5 are turned on and current flows to the gate of SCRI, and at the same time, TR7 is turned on and the circuit connected to it is energized. For this reason, current no longer flows to the base of the TRI and TRI turns OFF, so a current flows to the control switch S and y2, which turns TR2 and TR3 to N, and the circuit connected to the magnet M57 is energized, turning the magnet M57 off. It operates and the sewing machine is driven. At the same time as this sewing machine is driven, the sub-motion link 30 in its neck rotates clockwise in FIG.
The cloth is held between the holding arms 16 and 16' and the movable plate 11, and the four-hole button held between the holding arms 16 and 16' is located on the path of the needle 7 on the upper surface of the cloth. dynamic link 3
0, the actuating piece 52 switches to the control switch SW2, SW5.
3, the contacts of the control switches SW2 and SW53 become in the state shown by the two-dot chain line, and the magnet M57 becomes inactive. Furthermore, after the above-mentioned starting operation, when the operator releases the pedal, etc., the contact point of the manual switch SWI returns to the solid line position and TR4 and TR5 are turned off. Even if the contact point of the hand switch SWI is maintained at the position indicated by the two-dot chain line, when a certain amount of electricity is stored in the capacitor CI, current will stop flowing and TR4 and TR5 will turn OFF, so TR6 must be turned ON after the starting operation. Therefore, the contacts of the above control switches SW2 and SW53 are in the state shown by the two-dot chain line, and TR
When 8 is ○N and TR9 is ○FF and current flows to the gate of SCR2, SCR2 becomes ○N and current also flows to the gate of SCR3. However, due to the action of variable resistor R, etc., TRI
It takes time for the current to flow to the base of the TRI O', and for this reason, the sewing machine's first cycle sewing (combined from the 1st stitch to the 8th stitch mentioned above) is completed before the TRI O' base current flows, and the swing link is closed. 30 rotates counterclockwise in all directions, and the actuating piece 5
2 engages the control switch SW2, 53 and the contact returns to the solid line position, so SCR3 and TRIO do not turn OFF, so TR7 remains OFF, and TRI remains OFF for control. The state in which current flows through the switches SW2 and SW53 is maintained. It should be noted that after the contact of the control switch SW2 is restored, the SCR2 is in the closed state, so that the capacitor C2 starts storing electricity. Then, when the control switches SW2 and SW53 return, the magnet M57 is activated again to drive the sewing machine 1, and the second cycle sewing is started to stitch between the holes in the lower row of the four-hole buttons (see Fig. 4A). The 9th stitch to the 10th stitch) are performed. Then, as the sewing machine is driven, the contact point of the control switch SW2 returns to the state shown by the two-dot chain line, and current flows again to the gate of SCR3, but at this time, current flows to the base of TRIO due to discharge from capacitor C2, so SCR3 and TRIO turns ○N, and the circuit connected to them becomes energized, so that current no longer flows to the base of TR7, so TR7 turns ○FF, and TRI turns ○.
N, and no current flows to the control switch SW2. Then, when the second cycle sewing is completed, the control switch SW2,
Even if the contact point M53 returns to the solid line pupil, no current flows to the base of TR2, so the magnet M57 remains inoperative, and the sewing machine 1 is not driven again. Next, switch SW3 to the two-dot chain line position for sewing a two-hole button and start the sewing machine.
The control switch S is controlled by the first cycle sewing drive described above.
When the W2 contact is in the state shown by the two-dot chain line and SCR2 is turned on, current flows through the changeover switch SW3 to the base of TRIO, so SCR3 and TRIO are turned ○N, and therefore TR7 is turned ○FF and TRI is turned on. ○N, and no current flows through the control switches SW2 and SW53. Therefore, even if the first cycle sewing is completed and the contact point of the control switch SW2 returns to the solid line state, the magnet M57 remains inactive and the sewing machine 1 is not driven. In addition, when sewing the above-mentioned four-hole button, the thread cutting mechanism or the conventional holding arms 16, 1 are
6' rises to cut the needle thread, and the wiper mechanism pulls out the cut end to the top surface of the button and cloth before the second cycle sewing is performed. There are no threads between them,
Sewing is performed as shown in FIG. 4A. As described above, the present invention provides a cycle sewing device that considers a plurality of stitches as one cycle and stops the sewing machine when the sewing is completed, a manual switch for starting the sewing machine, and a changeover switch that can switch between two positions. At the first point of the changeover switch, the sewing machine is actuated to perform cycle stitching only once by the manual switch starting operation, and at the second point, the sewing machine is actuated to perform cycle stitching twice by the above-mentioned starting operation. By having a control means,
For example, when this invention is applied to a button-sewing machine for sewing buttons onto clothing, etc., a control system that performs only one-cycle stitches for all two-hole buttons, and two-cycle stitches for all four-hole buttons. If you switch the control system to perform synthesis, you can perform stitches that correspond to each button, making it easy to operate. Also, when sewing four-hole buttons onto fabric, After first sewing the two holes with the first cycle stitch, cut the bonito thread below the fabric using the thread cutting mechanism of the sewing machine, pull out the cut end above the button and fabric, and then sew the other two holes. If the holes are sewn using the second cycle stitch, the sewing thread will not cross between the first cycle stitch and the second cycle stitch, unlike conventional methods, resulting in a beautiful appearance. It is possible to form seams, which has the effect of significantly increasing the commercial value of the product.

In the above embodiment, the control device according to the present invention is implemented in a button sewing machine, but when it is implemented in a snap sewing machine to which a stop sewing machine is applied to perform stitching corresponding to the type of snap. The same effect as in the above embodiment can be obtained even when the present invention is applied to a buttonhole sewing machine and one buttonhole or two buttonholes are stitched consecutively.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a button sewing machine, Figure 2 is a left side view of the sewing machine, Figure 3 is a front view of the sewing machine, Figure 4A shows the sequence of sewing four-hole buttons, Figure 4B Figure 5 is an explanatory diagram showing the order of sewing two-hole buttons, and Figure 5 is V in Figure 3.
- An enlarged cross-sectional view along the line V', FIG. 6 is a cross-sectional view showing the bent part of a conventional wiper piece corresponding to FIG. 5, and FIG. 7A is a drawing of the needle thread by the wiper piece shown in FIG. 7B and C are explanatory diagrams showing the phenomenon that occurs after the needle thread is pulled out by a piece of the secondary wiper shown in FIG. 6, and FIG. 8A is the state shown in FIG. 7A. 8B is an explanatory diagram showing the sutured state when the next seam is formed in the state shown in FIG. 7C, and FIG. It is a control circuit diagram. The control lever is 3, the electric actuator is 57, the manual switch is SW1, the changeover switch is SW3, the first contact and the second contact are SW2, and the drive circuit, first cutoff circuit, and second cutoff circuit are shown in FIG. 9. Okuzu Gekuzu Jutazu ~ Taito 3zu Na 4zu Chikuzu Gekuzu 8zu*

Claims (1)

[Claims] 1. A control lever that can be moved to an active position that allows the rotation of the driving part to be transmitted to the main shaft and a non-active position that blocks the transmission, and a control lever that is maintained in the active position and specified in relation to the control lever moving to the active position. a control body that returns to a non-working position after the formation of cycle stitches of the number of stitches; and,
A manual switch SW1 that generates an activation signal in connection with manual operation; drive circuits TR2 and TR3 that conduct electricity to actuate the actuating body upon action and cut off electricity upon inaction; A control switch S that can be switched in conjunction with the sewing machine mechanism between a first state where the circuit is closed when the sewing machine is stopped and a second state where the circuit is closed when the sewing machine is stopped.
W2; a control circuit in which the control switch activates the drive circuit in response to an activation signal in a second state and disables the drive circuit in response to a first state of the control switch; an actuating circuit R, C2 which acts on the control circuit to activate the drive circuit irrespective of the state of the control switch for at least a longer period of time than is required to form a stitch in one cycle of the sewing machine; A control device for a cycle sewing machine, comprising a switch SW3 for enabling or disabling an operating circuit.