JP3114626B2 - Thread cutter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thread cutting device for a sewing machine for forming a stitch by relatively moving a stitch forming means and a cloth feeding means.

[0002]

2. Description of the Related Art Conventionally, in a sewing machine, a thread cutting cam fixed to a lower shaft and a knife moving mechanism are releasably connected. And the operation lever for thread cutting or
A dedicated driving member for setting the thread trimming state is configured to connect the thread trimming cam and the knife moving mechanism via a drive transmission mechanism dedicated to thread trimming. A dedicated driving member (for example, a thread cutting solenoid, a control circuit thereof, etc.) for setting the thread cutting state or a drive transmission mechanism (for example,
The thread cutting link mechanism) has been provided on the sewing machine together with other mechanisms of the sewing machine (a hook, a hook driving mechanism, a lower thread balance, a feed mechanism, and the like).

[0003]

However, since a solenoid dedicated to thread trimming, a control circuit for the thread trimming, and a drive transmission mechanism dedicated to thread trimming are separately required for thread trimming, the size of the sewing machine increases, the number of parts increases, and the like. In addition, there is a problem that the cost rises. Further, since such a mechanism dedicated to thread trimming is provided in the sewing machine, the arrangement, size, and movement range of other mechanisms of the sewing machine are limited, and the degree of freedom in designing the sewing machine is reduced.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a thread trimming device which is simplified and improves the degree of freedom in designing a sewing machine.

[0005]

In order to achieve this object, a thread cutting device according to the first aspect of the present invention comprises a feed member (1).
9) the cloth feed means (20) fixed thereto, and the cloth feeder
It is located on the movement path of the step (20), and
Outside the moving range of the cloth feeding means (20) at the time of maximum cloth feeding
And the cloth feeding means (20) is located at the time of forming a stitch.
The arm (18b) that is separated even at the maximum feed amount ,
The feed amount of the cloth feed means (20) when forming stitches can be changed.
At the time of thread trimming, the cloth feeding means (20) is stitch-shaped.
The cloth feeding means (2)
0) presses the arm (18b), and the knife moving mechanism (3)
Moving means (21) for making it movable.
You.

Therefore, the feed member (19) is
It is fixed to the step (20). The arm (18b) is
Located on the movement path of the cloth feeding means (20),
Movement range of the cloth feeding means (20) at the time of maximum cloth feeding during forming
The cloth feed means (20) located outside the enclosure
They are separated even at the maximum feed amount during forming. transportation
(21) The feeding at the time of forming the stitch of the cloth feeding means (20).
The thread feed amount can be changed,
(20) is moved beyond the moving range when forming the stitch,
The cloth feeding means (20) presses the arm (18b), and moves the knife.
The moving mechanism (3) is made movable. That is, the female
Stitch forming means for moving the power transmission mechanism and driving source for moving
Alternatively, it is constituted by cloth feeding means. The thread cutting device according to claim 2.
The lower shaft (1) that rotates in conjunction with the upper shaft and sewing needle
A thread cutting cam (2) fixed to the lower shaft (1);
Knife moving mechanism (3) near the upper part of the thread cutting cam (2)
Forming a seam in cooperation with the sewing needle;
A shuttle driven by (1), and arranged around the shuttle
Cloth feed means (20), which is a feeder,
A protrusion (20a) projecting upward at the step (20);
The cam for the female link B (10) of the female moving mechanism (3)
Move the lower (16) to a position where it can be engaged with the thread trimming cam (2).
The end (18c) for pushing and the projection (20a)
Thread trimming switching lever having an arm portion (20b) to be pressed
(18).

Accordingly, in the thread cutting device according to the second aspect,
The lower shaft (1) rotates in conjunction with the upper shaft and the sewing needle. yarn
The cutting cam (2) is fixed to the lower shaft (1).
The shuttle forms a seam in cooperation with the sewing needle, and
Driven by (1). The protrusion (20a)
Cloth feed means (20), which is a feed stand arranged around the shuttle
And project upward. The end (18c) is the thread trimming cam.
Mesulin of the knife moving mechanism (3) near the upper part of (2)
The cam follower (16) of the thread B (10)
Push to (2) and engageable position. Thread trimming switching lever (1
8) is an arm (20) pushed by the projection (20a).
b).

According to a third aspect of the present invention, there is provided a thread cutting device,
The projection (20) formed integrally with the feeding means (20)
a) wherein the protrusion (20a) is a feed plate
It is formed integrally with the step (20).

According to a fourth aspect of the present invention, a thread trimming command
Input means for inputting electronically;
Tilt the feed adjuster beyond the tilting state when forming the stitch.
Tilt means (22), and according to the input of the input means,
The tilting means (22) tilts the feed adjuster when forming a stitch
Tilting over That is, according to electronic input, thread trimming
At the time, the cloth feeding means
Power transmission mechanism and drive source for moving and moving the knife.
It consists of a feed adjuster and a tilting means.

[0010] The thread cutting device according to a fifth aspect moves in a predetermined direction.
Moving knife (5), rotating thread cutting cam (2)
The following position does not follow the thread trimmer cam (2).
A cam follower (16) movable to a following position;
The cam follower (16) moves
Thread following the moving knife (5)
Moving knife driving means (3) for performing the
For urging the follower (16) toward the non-following position.
The cloth feeding device in which the urging means (12) and the feeding member (19) are fixed.
On the moving path of the feeding means (20) and the cloth feeding means (20).
Fabric feeder at the time of maximum fabric feed at the time of normal stitch formation
The cloth feeding means (2) is located outside the moving range of the step (20).
0) is separated even at the maximum feed amount during stitch formation.
Arm portion (18b), and a first position around the rotation axis.
A second position is provided, and the first position and the second position
Rotatable and operatively connected to the cam follower (16).
Engaging and located in the second position, the cam
The follower (16) resists the urging force of the urging means (12).
A rotating member (18) for moving to the following position
The feed amount of the cloth feed means (20) when forming stitches can be changed.
At the time of thread trimming, the cloth feeding means (20) is stitch-shaped.
Move to a specific position beyond the range
Means (20) presses the arm (18b), and
Rotating the moving member (18) from the first position to the second position,
Moving means (21) for making the moving mechanism movable.
And the same rotation as the thread trimming cam (2),
The rotating member (18) moved to the second position is
Even after the means (20) has moved away from the specific position, the biasing may be performed.
The moving knife (5) is held in a second position against
A row allowing return to the first position after the cutting operation is completed.
Tally lock means.

According to a fifth aspect of the present invention, a moving knife is provided.
(5) moves in a predetermined direction. The thread trimming cam (2)
Turn over. The cam follower (16) is provided with the thread trimming cam.
(2) between a tracking position that tracks and a non-tracking position that does not track
Can be moved. The moving knife driving means (3) is
The follower (16) moves to the thread trimming cam (2) at the following position.
A thread trimming operation is performed on the moving knife (5) as it follows.
Let me know. The biasing means (12) is provided with the cam follower (1).
6) is biased toward the non-following position. Cloth feeding means
(20) fixes the feed member (19). Rotation
The member (18) is located on the movement path of the cloth feeding means (20).
Cloth feed means at the time of maximum cloth feed during normal stitch formation
The cloth feed means (2) is located outside the movement range of (20).
0) is separated even at the maximum feed amount during stitch formation.
Arm portion (18b), and a first position around the rotation axis.
A second position is provided, and the first position and the second position
Rotatable and operatively connected to the cam follower (16).
Engaging and located in the second position, the cam
The follower (16) resists the urging force of the urging means (12).
To move to the following position. The moving means (21)
The feed amount of the cloth feed means (20) when forming a stitch can be changed.
When the thread is cut, the cloth feeding means (20) is stitched.
Move to a specific position beyond the movement range at the time of formation, and
The feeding means (20) presses the arm (18b), and
Rotating the rotating member (18) from the first position to the second position,
The knife moving mechanism is made movable. Rotary lock
The means rotates in phase with said thread trimming cam (2),
Moving the rotating member (18) moved to the second position to the cloth
Even after the feeding means (20) moves away from the specific position,
The moving knife (5) is held in the second position against the urging means.
Is allowed to return to the first position after the completion of the thread trimming operation.
You.

According to a sixth aspect of the present invention, there is provided a thread cutting device,
The projection (20) formed integrally with the feeding means (20)
a) wherein the protrusion (20a) is a feed plate
It is formed integrally with the step (20).

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIGS. 2 to 7, a thread cutting cam 2 is fixed to an end of a lower shaft 1 which rotates in conjunction with an upper shaft and a sewing needle. A unit 3 is provided. The structure of the thread trimming unit 3 (scalpel moving mechanism: moving knife driving means) will be described. The thread trimming frame 4 is fixed to a sewing machine main body (not shown), and the thread trimming frame 4 is fixed.
A moving knife 5 slidably supported in the left-right direction with respect to the frame 4, a fixed knife 6 fixed to the thread trimming frame 4 for performing thread trimming in cooperation with the moving knife 5, and a thread trimming. A female link A8, which is swingably supported on a shaft 7 fixed to the frame 4 and drives the moving knife 5, and a shaft 9 fixed to the other portion of the thread cutting frame 4, A female link B10 that is slidably and slidably supported in the axial direction and that drives the female link A8 is provided. The female link A8 has a torsion spring 11 and the female link B10 has a compression spring 12
(Biasing means) respectively bias upward spring force. The female link B10 stands by at a predetermined position by a spring force, but can move in a vertical direction if it resists the spring force.

The thread cutting cam 2 has two cam surfaces 2b and 2c (face cams) having the lower shaft 1 as a rotation axis. The radius of the cam surface 2b is the radius of the cam surface 2c. Greater than. The cam surface 2b pushes the moving knife 5 toward the passage of the sewing needle.
Is deviated in the axial direction of the lower shaft 1 so as to retreat (separate) from the passage path of the sewing needle. This cam surface 2b
The outer peripheral rib 2a is integrally formed on the back surface of the cam surface 2b, and rotates integrally (in phase) with each of the cam surfaces 2b and 2c.

A shaft 17 extending in the left-right direction of the sewing machine is fixed to the thread cutting frame 4, and a thread cutting switching lever 18 (rotating member) is swingably supported on the shaft 17. . The thread cutting switching lever 18 has three projections extending radially in different directions from the axis of the shaft 17.

A round boss 18a extending parallel to the lower shaft 1 is formed at the tip of a projection extending downwardly behind the sewing machine of the thread cutting switching lever 18. The round boss 18a is located inside (at the center side) the outer peripheral rib 2a of the thread cutting cam 2 fixed to the lower shaft 1 during normal stitch formation. The round boss 18a is formed in such a size that it can pass through a notch formed in a part of the outer peripheral rib 2a in the radial direction of the thread cutting cam 2. The arm 18b extending above the thread cutting switching lever 18 is provided with the feed dog 1
Feeding table 20 (cloth feeding means) to which 9 (feeding member) is fixed
Are located on the movement path of the projection 20a. The arm 18b is located outside the range of movement of the projection 20a of the feed base 20 at the time of the maximum fabric feed at the time of normal stitch formation, and the arm 18b and the projection 20a of the feed base 20 are Even at the maximum feed amount when forming the stitches, they do not come in contact with each other.

An end portion 18c having a vertically curved surface (cylindrical surface) is formed at the extreme end of the arm portion extending rearward of the sewing machine of the thread cutting switching lever 18, and a U-shape bending of a rotation fulcrum portion of the female link B10 is formed. Part. The thread cutting switching lever 18 is integrally formed of a synthetic resin such that when the arm 18a is pressed backward, the round boss 18a is raised and the end 18c is lowered. As will be described later, it is configured such that whether or not the knife is movable is determined by the inclined state of the thread cutting switching lever 18.

As shown in FIG. 8, a feed dog 19 for moving a cloth to be sewn relative to a shuttle which forms a stitch in cooperation with a sewing needle is provided above the shuttle. Are located in The feed dog 19 is fixed to the upper surface of a feed stand 20 arranged around the shuttle, and is configured to move back and forth and up and down together with the feed stand 20. This shuttle has a lower shaft 1 that is rotated in synchronization with an upper shaft that drives the sewing needle up and down.
, And the upper shaft is rotated by a sewing machine motor. On the left side of the feed dog 19 of the feed base 20, a projecting portion 20a projecting upward is integrally formed.

The feed table 20 has an end opposite to the feed dog 19 swingably supported by an upper end of a feed arm. The lower end of the feed arm is swingably supported by the sewing machine body. One end of a feed link is swingably connected to an intermediate portion of the feed arm, and a square piece is swingably attached to the other end of the feed link. The square piece is formed so as to be slidable along a guide groove formed in the feed adjuster 21, and the feed adjuster 21 is fixed to a rotating shaft of a pulse motor 22 fixed to the sewing machine main body. Further, this feed link is provided with a horizontal feed cam 23 fixed to the lower shaft 1.
And the feed base is moved in the horizontal direction (the longitudinal direction of the sewing machine). Further, the feed table is configured to be moved up and down by a vertical feed cam (not shown).

A feeder 20, a feed link, a square piece, a feed adjuster 21, a feed arm, a feed arm shaft, and the like constitute a zero-mac link mechanism. By changing the inclination angle of the feed adjuster 21, the feed direction is changed. In addition, the moving amount of the feed dog 19 in the horizontal direction can be changed. As shown in FIG. 1, when the center line of the feed adjuster 21 extends in the vertical direction (solid line), the feed amount is “0”. Feed adjuster 21
As the center line of the sewing machine inclines in front of the sewing machine, the forward feed amount of the sewing machine increases, and when the center line inclines to the state shown by the two-dot chain line, the forward feed amount during normal stitch formation becomes maximum. Further, as the center line of the feed adjuster 21 tilts backward of the sewing machine, the reverse feed amount of the sewing machine increases, and when the center line tilts to the state shown by the one-dot chain line, the reverse feed amount during normal stitch formation becomes smaller. Will be the largest. Forward feed means that the cloth is moved to the rear of the sewing machine by the feed dog, and reverse feed means that the cloth is moved to the front of the sewing machine by the feed tooth.

The feed amount at the time of forming the stitch is set by a sewing manufacturer using a cloth feed amount input device, and the control unit CPU sends a pulse motor 22 through a drive circuit in accordance with an output signal from the cloth feed amount input device. Is controlled as shown in FIG. 1 (normal stitch formation range). In addition, the control device CPU causes the feed adjuster 21 to output the output signal of the thread trimming operation button.
Pulse motor 2 so that the center line of the
2 is controlled. The inclination of the center line of the feed adjuster 21 at the time of thread trimming is configured so as not to be set by the cloth feed amount input device. The inclined state at the time of thread trimming is a state in which it is further inclined beyond the normal feed direction at the time of normal stitch formation, and the feed base is the maximum movement range at the time of normal stitch formation (at the time of normal feed). To move forward and backward of the sewing machine. Further, the control device CPU is connected to a needle position sensor to determine whether or not the sewing needle is at a needle lower position where the thread can be cut (see FIG. 9).

Next, the operation at the time of thread trimming will be described (FIG. 10).
reference).

At the end of the sewing operation, the control unit CPU stops the sewing machine motor so that the sewing needle is positioned at the needle down state. When a thread trimming signal is electronically input by a sewing manufacturer through a thread trimming operation button or the like, the pulse motor 22 is turned on.
Is rotated by the control device CPU to a value equal to or greater than the normal maximum forward feed. As a result, the feed adjuster 21 is tilted as shown by the broken line in FIG. 1, the feed base 20 is moved backward from the time of the maximum forward feed, and the projection 20a of the feed base 20 becomes the arm of the thread cutting switching lever 18. 18b is pressed backward. At this time, the end 18c of the thread cutting switching lever 18 is lowered together with the female link B10 against the elastic force of the compression spring 12 spring. Accordingly, the engagement pin 16 (cam follower) provided on the female link B10 is pushed down to a position where the engagement pin 16 can be engaged with the thread cutting cam 2. In this way, the thread trimming switching lever 18 is swung by the feed adjuster 21. And
When the lower shaft 1 rotates, the moving knife 5 is reciprocated by the thread cutting cam 2 to perform a thread cutting operation. In this manner, the knife can be moved by the inclined state of the thread cutting switching lever 18.

On the other hand, after the sewing operation for stopping the needle lower operation is completed, a cutout portion of the outer peripheral rib of the thread trimming cam 2 is located above the round boss 18a of the thread trimming switching lever 18. As the arm 18b moves backward, the round boss 18a passes upward through the cutout portion of the outer circumferential rib of the thread cutting cam 2, and the outer circumferential rib portion 2a (the outer circumferential portion of the thread cutting cam 2). (Rotary lock means). When the lower shaft 1 rotates from this state, the outer peripheral rib 2a of the thread cutting cam 2 moves below the round boss 18a, and the feed base 20 operates forward of the sewing machine by the rotation of the horizontal feed cam 23, The protrusion 20a of the feed base 20 is the arm 18b of the thread trimming switching lever 18.
And leave. However, since the thread cutting cam 2 rotates together with the lower shaft 1, the round boss 18a is supported by the outer peripheral rib 2a of the thread cutting cam 2 that has reached below the round boss 18a, and the thread cutting switching lever 18 pushes down the female link B10. State is maintained. Thus, the contact between the thread cutting cam 2 and the pin 16 is maintained (see FIG. 7). The feed adjuster 21 is automatically returned to the position where the cloth feed amount is “0” while the feed base 20 is returning forward.

When the lower shaft 1 rotates and the thread cutting is completed, the cutout portion of the outer circumferential rib of the thread cutting cam 2 reaches below the round boss 18a, and the end of the thread cutting switching lever 18 ends. 18c is pushed up by the elastic force of the compression spring 12, and the round boss 18a passes below the notch.
Thus, after the completion of the thread cutting, the thread cutting state is automatically released.

In the above-described embodiment, the thread cutting switch lever 18 is controlled by the feed table 20 which is a cloth feeding means.
Is swung, and the thread trimming cam 2 shifts to a thread trimming state in which the thread moving unit 3 serving as the moving knife driving mechanism and the moving knife driving means can be driven. Therefore, the driving source for thread trimming is shared with the feed mechanism. This can be performed very easily, and the design of other shuttles, feed mechanisms, and the like of the thread cutting mechanism is not hindered. Further, since there is no drive source dedicated to thread trimming, a dedicated control circuit, and the like, the size of the sewing machine is prevented from being increased, and the sewing machine is simplified.

In the above-described embodiment, the thread trimming command from the sewing manufacturer is inputted by the electric input device, but the feed adjuster 21 is moved out of the above-mentioned feed range by a mechanical mechanism. Alternatively, it may be configured to be inclined. The above-described electrical input can further simplify the configuration of the sewing machine than a mechanical mechanism. In a mechanical mechanism in which the feed amount setting operation member and the feed adjuster 21 are connected by a zero-max link mechanism, the feed amount is determined by the position of the feed amount setting member. It is configured such that the position at the time of thread cutting is located on the extension of the position of the setting operation member. With this configuration, the thread cutting operation member and the feed amount setting operation member can be shared (see FIG. 11).

In the embodiment described above, the follow-up position of the cam follower (pin 16) is defined as the position of the pin 16 when the cam surface 2b, 2c of the thread trimming cam 2 engages with the pin 16.
And the non-following position is an ascending position of the pin 16 when the cam surface 2b, 2c of the thread trimming cam 2 is separated from the pin 16 (see FIGS. 4 and 3). Further, the first position of the rotating member (the thread cutting switching lever 18)
Thread trimmer switching lever 1 when pin 16 is raised
The position 8 (see FIGS. 3 and 4), and the second position of the rotating member is the position of the thread trimmer switching lever 18 when the pin 16 is lowered (see FIG. 7).

According to the above-described sewing machine, since the projection is formed on the feed table 20 and the thread cutting switching lever 18 is pressed against the sewing machine, the knife moving mechanism and the thread cutting cam for driving the knife moving mechanism are connected. A mechanism for bringing it into a possible state can be easily manufactured.

According to the above-described embodiment, the thread cutting switch lever 18 is pressed by the feed base 20 of the feed dog 19, but it may be a part of the embroidery frame that moves with respect to the sewing needle. good. In the above-described embodiment, the feed mechanism for feeding the cloth in the front-rear direction of the sewing machine has been described.
8 may be pressed. Furthermore, in the above-described embodiment, the sewing machine in which the reciprocating position of the sewing needle is fixed has been described. The thread cutting switching lever 18 may be pressed.

Further, in the above-described embodiment, the projection 20a is formed integrally with the feed base 20.
The protrusion 20a is formed separately from the feed base 20 and the feed base 20a is formed.
May be configured to be added later. In order to adjust the mounting position of the separately formed protrusion 20a, a through groove is formed in the feed base 20, and
A male screw portion that can be inserted into the through groove at the lower portion of the protruding portion 20a may be formed so that a bolt can be screwed into a male screw portion protruding from below the feed base 20.

[0033]

As is apparent from the above description, the book
According to the thread cutting device of the invention, when thread cutting,
Move the step beyond the moving range when forming the stitch, and
Move the scalpel because the truss is ready to move the scalpel
Power transmission mechanism and drive source for the
Can be.

According to the thread cutting device of the third aspect, the feeding
A convex portion is formed on the base 20, and the rotating member (18) is pressed against the
The knife moving mechanism and the knife moving mechanism
A simple mechanism for connecting the thread trimming cam
Can be manufactured.

According to the thread cutting device of the fourth aspect, the thread cutting is performed.
Command is issued electronically, and the cloth feeding means moves.
Movement means to move beyond the movement range when forming the stitch.
The thread is cut according to the electronic input. Therefore,
The configuration of the sewing machine can be simplified. Furthermore, at the time of thread cutting,
The feed adjuster is tilted beyond the tilt state at the time of stitch formation,
The scalpel moving mechanism can move the scalpel. Therefore,
Feed and adjust the power transmission mechanism and drive source for moving the knife
It can be constituted by a vessel or an inclination means.

According to the thread cutting device of the fifth aspect, the thread cutting is performed.
Specify the cloth feed member beyond the range at the time of cloth feed
Position and the moving knife drive means can move the moving knife
Power transmission mechanism for moving the moving knife
And the driving source can be constituted by cloth feeding means .

According to the thread cutting device of the sixth aspect, the feeding
A convex portion is formed on the base 20, and the rotating member (18) is pressed against the
The knife moving mechanism and the knife moving mechanism
A simple mechanism for connecting the thread trimming cam
Can be manufactured.

[Brief description of the drawings]

FIG. 1 is an explanatory view illustrating the inclination of a feed adjuster of a sewing machine according to the present invention.

FIG. 2 is a top view showing a thread cutting device when forming a stitch of the sewing machine.

FIG. 3 is a left side view showing the thread cutting device when forming a stitch of the sewing machine.

FIG. 4 is a right side view showing the thread cutting device when forming a stitch of the sewing machine.

FIG. 5 is a bottom view showing the thread cutting device when forming a stitch of the sewing machine.

FIG. 6 is a top view showing a thread trimming device at the time of thread trimming of the sewing machine.

FIG. 7 is a left side view showing the thread trimming device at the time of thread trimming of the sewing machine.

FIG. 8 is a view showing a configuration of a stitch forming device and a thread cutting device of the sewing machine.

FIG. 9 is a view showing an electric mechanism of the sewing machine.

FIG. 10 is a timing chart showing an operation of the sewing machine.

FIG. 11 is a view showing another embodiment of the sewing machine of the present invention.

[Explanation of symbols]

 2 Thread trimming cam 5 Moving knife 6 Fixed knife 8 Female link A 10 Female link B 18 Thread trimming switching lever 20 Feed bar

Claims (6)

(57) [Claims] 1. A thread cutting device for a sewing machine for forming a stitch by relatively moving a seam forming means and a cloth feeding means, wherein a cloth feeding means (20) having a feeding member (19) fixed thereto. And located on the movement path of the cloth feeding means (20),
Movement of the cloth feed means (20) at the time of maximum cloth feed at the time of forming the seam
The cloth feed means (20), which is located outside the movement range,
Arms (1) that are separated even at the maximum feed amount during stitch formation
8b) and the feed amount of the cloth feed means (20) when forming a stitch can be changed.
At the time of thread trimming, the cloth feeding means (20) is moved beyond the moving range at the time of forming a stitch, and the cloth feeding means (2 ) is moved.
(0) which presses the arm portion (18b) to move the knife moving mechanism (3) to a movable state ( 21 ). 2. A lower shaft which rotates in conjunction with an upper shaft and a sewing needle.
(1) a thread cutting cam (2) fixed to the lower shaft (1); and a knife moving mechanism (3) near and above the thread cutting cam (2).
When, the above-needle cooperation stitch formed, the lower shaft (1)
And a cloth feed means (2), which is a feed plate disposed around the shuttle.
0) and a protrusion (20) projecting upward by the cloth feeding means (20).
a) and the cam of the female link B (10) of the female moving mechanism (3)
The follower (16) can be engaged with the thread trimming cam (2).
The end (18c) for pushing into place and the protrusion (20)
a) a thread cutting switch having an arm (20b) pressed by
A bar (18).
Thread trimming device. 3. Integral with a cloth feeding means (20) as a feeding table.
Characterized in that it comprises a protruding part (20a)
The thread cutting device according to claim 1, wherein 4. An input means for electronically inputting a thread trimming command, and a tilting means (22) for tilting the feed adjusting device beyond a tilting state at the time of forming a stitch in accordance with an input from the inputting means. The thread cutting device according to claim 3, wherein: 5. A moving knife (5) that moves in a predetermined direction, a thread trimming cam (2) that rotates, and a follow-up position that does not follow the thread trimming cam (2).
Equipped with a cam follower (16) movable to the non-following position
The cam follower (16) is thread trimmed at the following position.
The moving knife (5) as it follows the cam (2).
The moving knife driving means (3) for performing the thread cutting operation and the cam follower (16) are moved toward the non-following position.
An urging means (12) for urging, a cloth feeding means (20) to which a feeding member (19) is fixed, and a sewing stitch which is located on a movement path of the cloth feeding means (20).
Movement range of the cloth feeding means (20) at the time of maximum cloth feeding during forming
The cloth feed means (20) is located outside the enclosure,
Arm (18b) that is separated even at the maximum feed amount
Having a first position and a second position around the rotation axis.
And is rotatable between the first position and the second position.
The cam follower (16) is operatively engaged with the second position.
By positioning the cam follower (16)
To the following position against the urging force of the urging means (12)
The feed amount of the rotating member (18) to be moved and the cloth feed means (20) when forming a stitch can be changed.
When the thread is cut, the cloth feeding means (20) is stitched.
Move to a specific position beyond the movement range at the time of formation, and
The feeding means (20) presses the arm (18b), and
Rotating the rotating member (18) from the first position to the second position,
Moving means (21) for moving the knife moving mechanism to a movable state
And the second position is rotated in phase with the thread trimming cam (2).
Moving the rotating member (18) to the
(20) the urging means even after leaving the specific position
Holding the moving knife (5) in the second position against
Rotary allowing return to the first position after operation is completed
A thread cutting device comprising a lock means. 6. An integral part of the cloth feed means (20) as a feed table.
Characterized in that it comprises a protruding part (20a)
The thread cutting device according to claim 5, wherein