JP5829928B2 - Sewing machine with automatic thread trimmer - Google Patents

Description

  The present invention relates to a sewing machine equipped with an automatic thread trimming device that can have a very simple structure in a sewing machine using a horizontal hook.

  In a sewing machine using a vertical hook in the automatic thread trimming device of the sewing machine, a movable knife that horizontally moves a thread that takes a substantially vertical path between the needle plate and the hook can be captured and cut. On the other hand, in an automatic thread trimmer for a sewing machine using a horizontal hook, the upper and lower threads from the needle hole of the needle plate to the horizontal hook are not vertical but take a complicated path such as an oblique path. It was. Therefore, it is difficult for the movable knife to capture the yarn, which causes a yarn trimming error. There is a patent document 1 etc. as a thread trimming device of a sewing machine using a horizontal hook, but this device catches both yarns by lowering both the upper and lower yarns downward from the yarn catching portion by a thread presser member when catching the yarn. And cut off.

Japanese Patent Laid-Open No. 6-339592

  In the above-mentioned Patent Document 1, both the upper thread and the lower thread are pushed down from the thread capturing portion by the thread pressing member when capturing the thread, and both threads are captured and cut. In other words, the thread retainer and drive means for driving the thread retainer are required near the horizontal hook, resulting in a complicated structure, which increases the cost, and the thread trimming mechanism cannot be mounted on an inexpensive sewing machine. There was a problem.

  Therefore, there has been a demand for a thread trimming mechanism that has a simple structure, can reliably capture upper and lower threads at low cost, and can smoothly perform thread trimming. An object of the present invention (technical problem to be solved) is to provide a sewing machine equipped with an automatic thread trimmer that can form an automatic thread trimmer with a very simple structure in a machine using a horizontal hook. It is in.

  In order to solve the above-mentioned problems, the inventor has intensively and researched. As a result, the inventor of the present invention has a needle for supplying an upper thread and a seam in cooperation with the needle. A horizontal hook for supplying bobbin thread to the hook, a catching means disposed on the upper surface of the horizontal hook to reciprocate in response to a thread trimming signal, and to reciprocate together with the catching means. A sewing machine comprising an automatic thread trimmer comprising a stationary knife arranged so as to intersect with a movable knife, and having a cutting means for cutting an upper thread and a lower thread which are captured and guided by the capturing means. The catching means includes a first catching guide means for raising the upper thread and the lower thread at the time of forward movement, and a second catching guide means for guiding the upper thread and the lower thread raised by the first catching guide means downward. Provided in opposite directions along the direction, and when the capture means is moved backward, The above problem is achieved by using a sewing machine having an automatic thread trimming device that cuts the upper thread and lower thread captured by the capturing guide means and the second capturing guide means by the cutting means comprising the movable knife and the fixed knife. Settled.

  According to a second aspect of the present invention, the capturing means includes a first inclined portion that is erected on one end side in the width direction on the front side in the projecting direction of the sliding plate portion and raises the upper thread and the lower thread at the upper end edge thereof. The first catching guide means is formed, and the upper side of the sliding plate portion is erected on the same side as the first catching guide means in the width direction on the rear side of the first catching guide means, and the upper thread and the lower thread are placed at the lower edge thereof. The second catching and guiding means having a second inclined portion that guides in the lower direction is formed, and the position of the tip of the second inclined portion of the second catching and guiding means is the position of the first inclined portion of the first catching and guiding means. The above problem has been solved by providing a sewing machine provided with the automatic thread trimmer according to claim 1 formed so as to be higher than the highest position.

  The invention according to claim 3 is a sewing machine provided with the automatic thread trimmer according to claim 1 or 2, wherein the first inclined portion and the second inclined portion are superposed in the longitudinal direction of the sliding plate portion. The above problem was solved. The automatic thread trimming device according to claim 2 or 3, wherein the first catching guide means and the second catching guide means are arranged at different positions in the width direction of the sliding plate portion. The above-described problems have been solved by using a sewing machine equipped with. The invention according to claim 5 is provided with the automatic thread trimming device according to claim 1, 2, 3 or 4, wherein the first inclined portion and the second inclined portion are formed as straight inclined edges. The above problem was solved by using a sewing machine.

  According to a first aspect of the present invention, the automatic thread trimming apparatus includes a catching means having a first catching guide means and a second catching guide means facing the first catching guide means along the longitudinal direction. During the forward movement of the catching means, the first catching and guiding means serves to raise the upper thread and the lower thread, and the second catching and guiding means removes the upper thread and the lower thread that have been raised by the first catching and guiding means. It serves as a guide toward the lower side so as to be suppressed from above.

  As a result, the upper thread and the lower thread are captured between the first capture guide means and the second capture guide means and below the capture means, and the capture means can be configured extremely simply. The upper thread and the lower thread can be captured extremely reliably and smoothly, and the cutting can be reliably performed by the movable knife and the fixed knife.

  According to a second aspect of the present invention, the first catching and guiding means is provided at a position closer to the front side in the reciprocating movement of the catching means with the direction protruding from the standby state as the front side. The first catching and guiding means is a first inclined portion for standing as a rising piece on one end side in the width direction of the sliding plate portion constituting the catching means, and raising the upper end edge of the upper thread and the lower thread. It is what.

  Further, the second catching and guiding means is on the rear side of the first catching and guiding means with respect to the sliding plate portion and on the same side as the first catching and guiding means in the width direction on the front side of the sliding plate portion. The lower end edge is set as a second inclined portion that guides the upper thread and the lower thread in the lower direction. Thus, the first catching and guiding means has the first inclined portion, the second catching and guiding means has the second inclined portion, and the upper thread and the lower thread are configured to rise and lower in an inclined manner, The configuration of the first catching and guiding means and the second catching and guiding means can be further simplified, and the catching of the upper thread and the lower thread can be caught more smoothly and reliably.

  In the invention of claim 3, the upper end portion of the first inclined portion of the first catching and guiding means and the inclined upper end portion of the second inclined portion of the second catching and guiding means are superposed in the longitudinal direction. As a result, the upper thread and the lower thread once captured by the first capture guide means and the second capture guide means are covered by the overlapping region of the first capture guide means and the second capture guide means and captured. The upper thread and the lower thread can be prevented from coming off and released from the first catching and guiding means and the second catching and guiding means, and the upper and lower threads can be stably and reliably cut.

  According to a fourth aspect of the present invention, the first catching and guiding means 1 and the second catching and guiding means are configured such that their positions are shifted in the width direction of the sliding plate portion. The guide means is separated in the width direction. Therefore, the upper thread and the lower thread can be easily entered from the space between the first catching guide means and the second catching guide means, and the catching operation can be made smoother. In the invention of claim 5, since the first inclined portion and the second inclined portion are formed as linear inclined edges, the upper thread and lower thread can be captured instantly, and smooth and quick cutting work can be achieved. can do.

(A) is a plan view around the capturing means, cutting means and horizontal hook in the present invention, (B) is a cross-sectional view taken along arrow X1-X1 with part of (A) omitted, and (C) is a perspective view of essential parts in the present invention. FIG. (A) is a perspective view which shows the structure of the capture | acquisition means, cutting | disconnection means, and base plate in this invention, (B) is a perspective view of the state which isolate | separated the capture | acquisition means, the cutting | disconnection means, and the base plate. (A) is a plan view of the capturing means, (B) is a perspective view of the main part of the capturing means, (C) is a view taken along arrow X2-X2 in (A), and (D) is cut into a sliding plate portion of the capturing means. The top view of the state to which the movable knife of the means was fixed, (E) is a X3-X3 arrow sectional view of (D). (A) is a perspective view of a state in which the movable knife of the cutting means is fixed to the sliding plate portion of the capturing means, and (B) is a main part plane in which the movable knife of the cutting means is fixed to the sliding plate portion of the capturing means. (C) is a cross-sectional view taken along the line X4-X4 in (B), and (D) is a cross-sectional view taken along the line Y1-Y1 in (C). (A) is a main part side view of an embodiment in which the first inclined portion and the second inclined portion are formed in an arc shape, and (B) is an embodiment in which the rear end of the first inclined portion and the front end of the second inclined portion are separated from each other. It is a principal part side view. (A) is a perspective view of the main part in the standby state of the catching means, (B) is a perspective view of the main part in a state where the upper thread and lower thread are caught by the catching means, and (C) is an upper thread by the catching means and the cutting means. FIG. 3 is a perspective view of a state where the lower thread is cut. (A) is a plan view of the capturing means in a standby state, and (B) is a cross-sectional view taken along the line X5-X5 with part of (A) omitted. (A) is a plan view of the upper yarn and lower yarn catching operation start state by the catching means, and (B) is a cross-sectional view taken along arrow X6-X6 with a part of (A) omitted. (A) is a plan view of a state where the upper thread and lower thread have been captured by the capturing means, and (B) is a cross-sectional view taken along X7-X7, with part of (A) omitted. (A) is a top view of the cutting operation state of the upper thread and the lower thread by the catching means and the cutting means, and (B) is a cross-sectional view taken along arrow X8-X8 in which (A) is partially omitted. (A) is a plan view of a state where cutting of the upper thread and lower thread by the catching means and cutting means is completed, and (B) is a cross-sectional view taken along arrow X9-X9 in which (A) is partially omitted. 1 is an overall perspective view of a sewing machine equipped with the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, etc., the present invention is mainly composed of an upper thread Nu and lower thread Nd capturing means A and cutting means B. A needle plate 71 is provided on the arm 7a of the sewing machine body 7 (see FIG. 12), a horizontal hook is installed inside the arm 7a, and a capturing means A and a cutting means B are incorporated at the installation location. is there. The horizontal hook is composed of an outer hook 72 and an inner hook 74.

  An outer hook 72 that rotates around the hook shaft 73 is disposed on the front side of the needle 8 at the needle plate 71. A feed dog 76 is provided at a position on the far side where the needle 8 is installed so as to be movable in the vertical and horizontal directions (see FIGS. 1A and 1C). Further, an inner hook 74 is accommodated in the horizontal hook, and a bobbin 75 wound with a lower thread is accommodated in the inner hook 74 (see FIG. 1B).

  The catching means A is composed of a first catching and guiding means 1, a second catching and guiding means 2, and a sliding plate portion 3 (see FIG. 2B and FIGS. 3A to 3C). The capturing means A is mounted so as to reciprocate with respect to the base plate 6 mounted on the sewing machine body 7 [see FIG. 1 (A), (B), FIG. 2 (A), FIG. ]. The base plate 6 is installed and fixed inside the arm 7a.

Specifically, a guide path 61 for guiding the sliding plate portion 3 of the capturing means A is formed on the base plate 6, and driving means that is driven in the guide path 61 by a power source such as a motor. 62 is arranged [see FIG. 2 (B)]. The capturing means A is connected to the driving means 62 and can reciprocate in the longitudinal direction along the guide path 61. On the upper surface of the sliding plate portion 3, a movable knife 4 constituting the cutting means B is fixed with a gap S (see FIG. 3E).

  The first catching and guiding means 1 is formed at a position slightly behind the front end of the sliding plate portion 3 [see FIGS. 3A and 3B]. The second catching and guiding means 2 is provided so as to face the first catching and guiding means along the longitudinal direction of the sliding plate portion 3 and at a position on the rear side of the first catching and guiding means 1. [See FIGS. 2 and 3 (A) to 3 (C)].

  Here, for the front side and the rear side of the catching means A, the direction in which the catching means A protrudes when starting reciprocating movement to start the thread trimming operation from the standby state of the thread trimming operation is the front side, The opposite side to the front side in the longitudinal direction is the rear side (see FIG. 3A). The first catching and guiding means 1 is erected and formed as a substantially triangular plate-like rising piece, near the front side in the longitudinal direction of the sliding plate portion 3 and from the one end side in the width direction of the sliding plate. It is formed so as to be bent substantially perpendicular to the flat surface of the portion 3 (see FIGS. 3A to 3C, etc.).

  The shape of the first catching and guiding means 1 is formed in a substantially triangular shape as described above, and the portion corresponding to the inclined side serving as the upper edge of the first capturing and guiding means 1 is the first inclined portion 11. The edge toward the sliding plate part 3 located below from the top end position is defined as a catching / locking part 12 (see FIG. 3C). The angle θ formed between the capture locking portion 12 and the sliding plate portion 3 forms an acute angle.

  The 1st inclination part 11 of the 1st acquisition guide means 1 of the acquisition means A is the inclined part which raises gradually toward the back side from the front side of the sliding plate part 3 [refer FIG.3 (C)]. A catching groove 32 is formed at the lower end position of the catching locking part 12 and in the sliding plate part 3 (see FIGS. 3A and 3B). The catching groove 32 is a groove-shaped part that is open at one end in the width direction of the sliding plate 3 and is cut into a substantially U shape. Moreover, as a formation direction of the capture groove part 32, the part opened with respect to the sliding plate part 3 is formed in an inclined shape in the horizontal direction toward the front side with respect to the rear side [FIG. 3 (A), ( See B)].

  The first inclined portion 11 of the first catching and guiding means 1 serves to raise the upper thread Nu and the lower thread Nd when the catching means A moves forward (see FIGS. 3C and 8B). The locking portion 12 serves to lock the upper thread Nu and the lower thread Nd that reach the upper end of the first inclined portion 11 and fall to the sliding plate portion 3 side during the backward movement.

  Further, when the catching means A moves backward, the upper thread Nu and the lower thread Nd enter the catching groove 32 formed in the sliding plate 3 while being latched by the catching latch 12 [FIG. The upper thread Nu and the lower thread Nd are transferred in the backward movement direction, and the upper thread Nu and the lower thread Nd are cut by the movable knife 4 and the fixed knife 5 constituting the cutting means B.

  The second catching and guiding means 2 is formed along the longitudinal direction of the sliding plate portion 3 while facing the first catching and guiding means 1 (see FIG. 3). The second catching and guiding means 2 is formed upright in a substantially rising piece shape (see FIGS. 3 (B) and 3 (C)), and is forward and above the end portion in the width direction of the sliding plate portion 3. It is the site | part which protruded and formed toward [refer FIG. 3 (B), (C)].

  And the lower end edge side of the protrusion part of the said 2nd acquisition guide means 2 is formed as the 2nd inclination part 21. As shown in FIG. The second inclined portion 21 is an inclination that gradually decreases from the front side toward the rear side (see FIG. 3C). The second inclined portion 21 serves to guide the upper yarn Nu and the lower yarn Nd raised by the first inclined portion 11 of the first catching and guiding means 1 while being lowered along the direction of the sliding plate portion 3. [See FIG. 3C]. In FIG. 3C, the upper thread Nu and the lower thread Nd are raised by the first inclined portion 11 of the first catching and guiding means 1 and lowered by the second inclined portion 21 of the second catching and guiding means 2 as dotted lines. Is shown.

となる〔図３（Ｃ）参照〕。これによって、第１捕捉案内手段１の第１傾斜部１１によって上昇した上糸Ｎｕ，下糸Ｎｄは、頂部付近まで上方すると同時に、第２捕捉案内手段２の第２傾斜部２１によって上方から押さえ付けられて下方に案内されるようにすることができる。 The first catching and guiding means 1 and the second catching and guiding means 2 are both formed at one end in the width direction of the sliding plate portion 3 and close to the width direction. And the height dimension H2 of the highest position of the 2nd inclination part 21 is formed higher than the height dimension H1 of the highest position of the said 1st inclination part 11. FIG.
That is,

[See FIG. 3C]. As a result, the upper thread Nu and the lower thread Nd raised by the first inclined portion 11 of the first catching and guiding means 1 are moved up to the vicinity of the top and simultaneously pressed from above by the second inclined portion 21 of the second catching and guiding means 2. It can be attached and guided downward.

  Moreover, the inclination upper end location of the said 1st inclination part 11 and the inclination upper end location of the said 2nd inclination part 21 have overlapped in the longitudinal direction (refer FIG. 3 (A), (C)). This is configured such that the rear end portion of the first inclined portion 11 and the front end portion of the second inclined portion 21 overlap in the front-rear direction.

  That is, a region where the front end portion of the second inclined portion 21 is located above the rear end portion of the first inclined portion 11 is configured. As a result, the upper thread Nu and the lower thread Nd once captured by the first capture guide means 1 and the second capture guide means 2 are covered by the overlapping region of the first capture guide means 1 and the second capture guide means 2. It will be.

  Accordingly, the captured upper thread Nu and lower thread Nd can be made extremely difficult to be released from the captured state by the first captured guide means 1 and the second captured guide means 2 and are not easily released. It is possible to shift to the cutting operation of the yarn Nd (see FIGS. 9 and 10). Further, the rear end portion of the first inclined portion 11 and the front end portion of the second inclined portion 21 may be separated by a slight distance δc without overlapping in the front-rear direction (see FIG. 5B).

  Further, the first catching and guiding means 1 and the second catching and guiding means 2 are formed with their positions shifted in the width direction of the sliding plate portion 3 (see FIGS. 3A and 3B). That is, the first catching and guiding means 1 and the second catching and guiding means 2 are slightly separated in the width direction. As a result, the upper thread Nu and the lower thread Nd can easily enter from the space where the first catching guide means 1 and the second catching guide means 2 are separated, and the catching operation can be made smoother. .

  Further, the first inclined portion 1 and the second inclined portion 2 are formed as linear inclined edges. The first inclined portion 11 may be formed in a convex arc shape, and the second inclined portion 21 may be formed in a concave arc shape [see FIG. 5A]. As a result, the capturing operation of the upper thread Nu and the lower thread Nd can be performed instantaneously, and a smooth and quick cutting operation can be achieved.

  The movable knife 4 constituting the cutting means B has a movable blade portion 41 formed at the front end of the support plate portion 42. The support plate portion 42 is formed to be narrow in the width direction on the front side and on the side where the movable blade portion 41 is formed (see FIG. 2B). The movable knife 4 is polymerized with a gap S between it and the sliding plate portion 3.

  In the gap S, a space member 31 is disposed between the sliding plate portion 3 and the movable knife 4, and the sliding plate portion 3, the space member 31, and the movable knife 4 are fixed to the screw with a fixing tool such as a screw. The sliding plate portion 3 and the movable knife 4 are integrated with each other by being fixed to the driving means 62 via the tool 33 (see FIG. 4A).

  In the configuration in which the sliding plate portion 3 and the movable knife 4 are integrated, the movable blade portion 41 of the movable knife 4 is configured to be positioned closer to the front end of the sliding plate portion 3 [FIG. 3 (D), FIG. 4 (A), (B) etc.]. In the configuration in which the sliding plate portion 3 and the movable knife 4 are fixed and integrated, the movable knife 4, the first catching guide means 1, and the second catching guide means 2 are arranged in this order from the front side. 3 (D)].

  A gap S corresponding to the thickness of the space member 31 is formed between the sliding plate portion 3 and the movable knife 4. The space S is a portion into which a fixed knife 5 constituting a cutting means B described later is loosely inserted (see FIG. 4). The fixed knife 5 is formed in a flat plate shape, one side of which is a fixed cutting blade 51, and is arranged so as to intersect the movable knife 4.

  The fixed knife 5 is fixed to a predetermined position inside the sewing machine body 7 and is a stationary member. That is, the upper thread Nu and the lower thread Nd are cut when the movable knife 4 that moves relative to the stationary knife 5 that does not move intersects. The fixed knife 5 is fixed to the base plate 6 in a stationary state by a fixing member 9 (see FIG. 2).

  A movable knife 4 constituting the cutting means B is fixed to the sliding plate portion 3 of the capturing means A. And it arrange | positions at the guide path 61 of the baseplate 6, and the drive means 62 which drives with power sources, such as a motor, in this guide path 61 is arrange | positioned. The capturing means A is connected to the driving means 62 and can reciprocate along the guide path 61. As described above, the fixed knife 5 does not move, and the capture means A and the movable knife 4 reciprocate with respect to the fixed knife 5, and the movable knife 4 and the fixed knife 5 cross each other. The thread Nu and the lower thread Nd are cut.

  Next, a process in which the upper thread Nu and the lower thread Nd are cut by the catching means A and the cutting means B according to the present invention will be described with reference to FIGS. 6 and 7 to 11. 6A is a standby state of the catching means A, FIG. 6B is a catching state of the upper thread Nu and the lower thread Nd, and FIG. 6C is an upper thread Nu and lower thread from the cutting means B. The yarn Nd is in a cut state. FIGS. 7 to 11 are views seen from the plane and the side showing the process of capturing and cutting the upper thread Nu and the lower thread Nd.

  First, the first stroke is a catch standby state in which the thread trimming operation is not performed (see FIGS. 6A and 7). In this process, in the capturing means and the cutting means, the capturing means A and the tip of the movable knife 4 are located on the left side of the drawing and are in an inoperative state. The upper thread Nu and the lower thread Nd are positioned in the height direction above the sliding plate portion 3 of the capturing means A and below the top of the first inclined portion 11 of the first capturing guide means 1. [See FIG. 7B].

  Next, the second stroke is a stroke in which a cutting command for the upper thread Nu and the lower thread Nd is issued and the capturing operation is started (see FIG. 8). The outer hook 72 rotates, and the sword tip 72 a formed on the outer hook 72 moves the locking portion of the upper thread Nu with the sword tip 72 a along the circumferential direction of the outer hook 72. The movable knife 4 constituting the capturing means A and the cutting means B moves together along the forward direction of the reciprocating direction.

  During the movement of the capturing means A and the movable knife 4 in the forward direction, as described above, the upper thread Nu and the lower thread Nd are located on the upper side of the sliding plate portion 3 of the capturing means A. As the first catching and guiding means 1 moves forward, the upper thread Nu and the lower thread Nd are lifted along the first inclined portion 11 and ascend from the sliding plate portion 3, and further, the capturing means A moves forward. The upper thread Nu and the lower thread Nd are close to the top end position of the first inclined part 11 of the first catching and guiding means 1 and the upper thread Nu and the lower thread Nd are in contact with the second inclined part 21. [Refer FIG. 8 (B)].

  Next, the third stroke is a stroke in which capturing of the upper thread Nu and the lower thread Nd is completed (see FIG. 9). The second inclined portion 21 from the tip of the second catching and guiding means 2 facing the first catching and guiding means 1 slightly before the upper thread Nu and the lower thread Nd are about to reach the top end point position of the first inclined portion 11. Be guided to. The second inclined portion 21 is operated so as to press against the upper thread Nu and the lower thread Nd, so that the second inclined portion 21 moves from the top end position of the first inclined portion 11 of the first catching and guiding means toward the sliding plate portion 3. The upper thread Nu and the lower thread Nd are held in a portion formed between the first catching and guiding means 1 and the second catching and guiding means 2. It will enter (see FIG. 9B). Further, when the catching is completed, the upper thread Nu is detached from the sword tip 72 a of the outer hook 72.

  Next, the fourth stroke is a stroke in which the cutting operation is started, and the upper thread Nu and the lower thread Nd captured by the first capturing guide means 1 and the second capturing guide means 2 of the capturing means A are captured by the capturing groove 32. The upper thread Nu and the lower thread Nd locked in the catching groove 32 are conveyed to the position of the stationary knife 5 (see FIG. 10).

  The fifth stroke is a state in which cutting of the upper thread Nu and the lower thread Nd has been completed (see FIG. 11). In this process, the upper thread Nu and the lower thread Nd locked in the capturing groove 32 of the capturing means A pass through the position of the fixed knife 5 and move with a delay from the first capturing guide means 1 and the second capturing guide means 2. The upper knife Nu and the lower thread Nd are cut by the movable knife 4 that intersects the stationary knife 5 that does not move.

A ... Capture means, B ... Cutting means, 1 ... First capture guide means, 11 ... First inclined portion,
2 ... 2nd acquisition guide means, 21 ... 2nd inclination part, 3 ... Sliding plate part, 4 ... Movable knife,
5 ... fixed knife, 72 ... outer hook, 8 ... needle, Nu ... upper thread, Nd ... lower thread.

Claims (5)

  A needle for supplying the upper thread, a horizontal hook for supplying the lower thread to form a seam in cooperation with the needle, and a reciprocating movement by a thread trimming signal disposed on the upper surface of the horizontal hook An upper thread that is captured by the capturing means and guided by the capturing means that moves to capture the upper thread and the lower thread, and a fixed knife that crosses the movable knife that reciprocates with the capturing means. In the sewing machine equipped with an automatic thread trimming device having a cutting means for cutting the upper thread and the lower thread, the catching means is a first catching guide means for raising the upper thread and the lower thread at the time of forward movement, and the first catching guide means. And the second catching guide means for guiding the upper thread and the lower thread raised by the lower side in the longitudinal direction. When the catching means returns, the first catching guide means and the second catching guide are provided. The upper thread and lower thread captured by the means Sewing machine with an automatic thread cutting apparatus characterized by being cut by comprising cutting means.   The catching means forms the first catching and guiding means which has a first inclined portion which stands on one end side in the width direction on the front side in the protruding direction of the sliding plate portion and raises the upper thread and the lower thread at the upper end edge thereof. And a rear end of the sliding plate portion that is on the same side as the first catching and guiding means in the width direction and guides the upper thread and the lower thread in the lower direction at the lower edge thereof. The second catching and guiding means having two inclined portions is formed, and the position of the tip of the second inclined portion of the second catching and guiding means is higher than the highest position of the first inclined portion of the first catching and guiding means. The sewing machine provided with the automatic thread trimming device according to claim 1, wherein the sewing machine is formed as follows.   The sewing machine equipped with the automatic thread trimmer according to claim 1 or 2, wherein the first inclined portion and the second inclined portion are superposed in the longitudinal direction of the sliding plate portion.   The automatic thread trimmer according to claim 2 or 3, wherein the first catching and guiding means and the second catching and guiding means are arranged at different positions in the width direction of the sliding plate portion. A sewing machine provided.   The sewing machine provided with the automatic thread trimming device according to claim 1, 2, 3, or 4, wherein the first inclined portion and the second inclined portion are formed as straight inclined edges.

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