JP3924367B2 - Sewing machine female equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine knife device having a knife for cutting a cloth simultaneously with sewing.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there has been developed a sewing machine having a scalpel device that has a knife that is driven to cut a cloth and can perform sewing while cutting the cloth with the knife.
This scalpel device cuts the cloth across a cloth that is sewn between a fixed scalpel provided near the upper surface of the needle plate and a moving scalpel that moves substantially in the vertical direction, on the sewing table of the sewing machine. It is installed beside the needle plate, and its movement mechanism is provided below the sewing table of the sewing machine.
[0003]
In such a sewing machine, sewing is performed by driving a sewing part such as a sewing needle and cloth feed, and at the same time, for example, a moving knife is driven up and down beside the needle plate to cut the cloth while performing sewing. It has become. The structure for moving the moving knife is a structure in which a moving knife is provided on an arm that swings around a fulcrum using a swing shaft connected to the lower shaft of the sewing machine or a motor other than the drive of the sewing machine as a drive source. It has become. The moving knife provided at the tip of the arm performs an arc motion due to the configuration of the arm.
[0004]
  By the way, a hook portion having a lower thread is provided below the sewing table of the sewing machine.For example, in a sewing machine that performs zigzag stitching, there is a restriction on the hook arrangement, and the hook arrangement as shown in FIG. One of them. FIG. 7 is a view of the needle plate 17 of the sewing table of the sewing machine as viewed from above. In this figure, 16 is a needle hole, 17 is a needle plate, 18 and 19 are rear and front hooks, 18a and 19a are mechanisms for driving the hooks 18 and 19, and 29 is a lower shaft. . In other words, in a sewing machine that performs zigzag stitching, by swinging the sewing needle in the left-right direction (the arrow direction in the figure),zigzagIn order to perform sewing, hooks 18 and 19 are arranged below one side of the needle hole 16 located at the approximate center of the needle plate 17 on the back side or the near side. The female device provided in such a sewing machine is arranged as shown in FIG.
[0005]
8 (a) and 8 (b) are side views of a conventional female device disposed below the sewing table, respectively, and FIG. 8 (a) is a diagram illustrating that the shuttle is disposed on the operator side (front side) in the above-described sewing machine. It is a side view of an example of the scalpel device at the time of being performed, and (b) is a side view of an example of the scalpel device when the shuttle is arranged on the counter worker side (the back side) in the sewing machine. 8 (a) and 8 (b), 100 and 103 are female devices, 120 and 120a are sewing machine frames, 121 and 131 are arms, 122 and 132 are moving knifes, and 123 and 133 are sewing frames 120 and 120a. Fixed knives 127, 137, which are respectively fixed, are knife drive shafts. In the female devices 100 and 103 of FIGS. 8A and 8B, the arms 121 and 131 provided on the female drive shafts 127 and 137 respectively swing the female drive shafts 127 and 137 (reciprocating rotational motion). The moving knife 122, 132 swings up and down by swinging up and down by means of this, and a cloth (sewing material) is sandwiched between the moving knife 122, 132 and the fixed knife 123, 133, It is configured to cut.
[0006]
That is, in FIG. 7, for example, when the hook 19 is provided on the operator side, which is the front side, a mechanism 19a for driving the hook installed on the worker side is provided on the front side across the needle drop. Therefore, as shown in FIG. 8A, the fulcrum of the knife cannot be arranged on the worker side and is arranged on the counter worker side.
Thus, in the scalpel device 100 in which the fulcrum (female drive shaft) 127 is arranged on the side opposite to the worker, when the moving knife 122 lowers and cuts the cloth, the moving knife 122 has a cloth feeding direction. Movement in the opposite direction (X1 direction) occurs.
Further, when the hook 18 is arranged on the side opposite to the worker, the fulcrum of the knife cannot be arranged because the mechanism 18a for driving the hook 18 is arranged around the hook 18 as shown in FIG. In addition, it is arranged on the operator side.
Thus, in the scalpel device 103 in which the scalpel 137 is arranged on the operator side, when the moving knife 132 is lowered and cuts the cloth, the moving knife 132 moves in the cloth feeding direction (X2 direction). Will occur.
[0007]
[Problems to be solved by the invention]
By the way, in the actual sewing, the formed sewing path is not linear, and as shown in the plan view of the sewn cloth in FIG. 9, the left-turn curve A and the right-turn curve are viewed from the operator side. There are cases where the sewing route is as in B. The curve A-shaped sewing path is formed by turning the cloth counterclockwise around the needle drop during sewing. Also, the curve B-shaped sewing path is formed by sewing while turning the cloth clockwise around the needle drop.
[0008]
In the case of such a curve A and curve B-shaped sewing path, the above-described conventional movement of the knife has the following problems.
First, when forming a curve A-shaped seam, the structure shown in FIG. 8 (a) is provided with a knife movement mechanism on the counter-worker side, so the cloth is rotated counterclockwise around the needle drop. The cloth that is cut by the knife will cut more cloth than the part that is sewn by the needle drop, and the knife's blade will become a resistance, resulting in poor cutting or the cloth being caught by the knife. A possibility arises. In this regard, when the knife movement mechanism is provided on the operator side shown in FIG. 8 (b), the blade moves in the direction of drawing the cloth to be fed, that is, in the X2 direction, and cuts the cloth. Wrinkles can be absorbed and cut appropriately.
[0009]
Conversely, when forming a curve B-shaped seam, as shown in FIG. 8 (b), if the structure is provided with a movement mechanism of a knife on the operator side, the cloth is rotated clockwise around the needle drop. Therefore, the knife will pull the cloth, and the knife may not cut a sufficient length, or it may be sewn with the cloth stretched and the quality of the finished product may be reduced. . In this regard, the knife movement mechanism shown in FIG. 8A is preferable because the knife cuts the cloth to be fed so that it is repelled, so that the cloth is not sewn in a stretched state. .
In this way, when forming a seam that is curved to the left and right, if the movement mechanism of the knife is suitable for each, the mechanism itself inside the sewing machine must be changed and cannot be easily switched.
[0010]
Therefore, the object of the present invention is not limited by the position of the hook disposed below the upper surface of the bed, and preferably suitably changes the moving direction of the moving knife according to the direction of the cloth to be sewn. An object of the present invention is to provide a female knife device for a sewing machine that can cut a cloth.
[0011]
[Means for Solving the Problems]
  Solve the above issuesMeans for doing this are shown below.
[0014]
  Claim 1The sewing machine knife device according to the present invention is provided with a fixed knife provided facing the cloth feed surface, a moving knife for cutting the cloth by sandwiching the fixed knife and the cloth, and a lower side of the cloth feed surface. And a moving knife movement mechanism that reciprocates the moving knife in the vertical direction with respect to the cloth feed surface by transmitting a driving force of the driving section.When,The moving knife movement mechanismProvided inThe adjusting means capable of changing the moving direction of the moving knife from the state inclined in the cloth feeding direction to the state inclined in the opposite direction to the cloth feeding direction.WithThe configuration.
[0015]
  The above configurationTherefore, the direction of the reciprocating motion of the moving knife can be changed and adjusted from the direction inclined in the cloth feeding direction to the direction inclined in the opposite direction to the cloth feeding direction by the moving knife moving mechanism. However, even if it turns to the right or to the left, the movement direction of the moving knife can be changed by the adjustment using the adjusting means so as to perform cutting suitable for the bending condition of the sewing path. In other words, when cutting the cloth to the right, the moving knife draws a trajectory in the direction of pushing back the cloth sent to the cloth feeding surface by tilting the reciprocating direction of the moving knife in the cloth feeding direction. The cloth can be cut efficiently and suitably. Also, when cutting the cloth in a left turn, the reciprocating direction of the moving knife is inclined in the direction opposite to the cloth feeding direction, so that it is efficiently suitable to draw a track that pulls in the cloth. Can cut the cloth.
[0016]
Here, the moving knife movement mechanism can be constituted by, for example, a mechanism that uses the movement of an intermediate link of a four-bar link, which will be described later, or a mechanism that moves the moving knife along a guide that extends in the vertical direction. The adjusting means for changing the moving direction of the moving knife can be configured by changing the connecting point of the intermediate link when the four-bar link is used, and when the guide is used, the direction of the guide can be changed. It is possible by changing the configuration.
[0017]
  Furthermore, the invention of claim 1The drive unit is a drive shaft that reciprocally rotates about an axis, and the moving knife movement mechanism is connected to the drive shaft, and one end side of the drive unit swings up and down with respect to the cloth feed surface. A four-bar link comprising a lever, a second lever that is pivotally connected about an arbitrary fulcrum, and a link that is coupled to each of the first lever and the second lever; The adjusting means is configured to be able to change a connection position between the link and the first lever and the second lever, and the moving knife is fixed to the link, and the movement of the link causes the cloth feeding surface to be moved. On the other hand, a reciprocating motion was made in the vertical direction.
  This “reciprocating motion in the vertical direction” includes, for example, the state of FIG. 6A and the state of FIG.
[0018]
  The above configurationAccordingly, the four-bar link moved by the drive shaft causes the link to reciprocate in the vertical direction, and the moving knife fixed thereto also reciprocates in the vertical direction. The cloth on the surface can be cut. In addition, since the connection position between the link and the first and second levers is formed to be changeable, the link trajectory is tilted in a predetermined direction from a vertical one by changing the connection position. Can be changed. Accordingly, by changing the connecting position, the moving direction of the moving knife can be adjusted from a state inclined in the cloth feeding direction to a state inclined in the direction opposite to the cloth feeding direction.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the female knife device of the sewing machine according to the present invention will be described below with reference to FIGS.
First, FIG. 1 is a perspective view showing an example of a main body of a sewing machine to which a female knife device according to the present invention is applied, FIG. 2 is a side view showing an example of a female knife device according to the present invention in FIG. FIG. 3 is an enlarged side view showing a moving knife movement mechanism that is a link mechanism that transmits movement to the moving knife in FIG. 2.
[0020]
As shown in FIG. 1, a sewing machine knife device 200 according to an embodiment of the present invention is provided beside a needle plate 23 on an upper surface of a bed 12 that is a cloth feed surface of a sewing machine body 11 installed on a sewing machine table 10. They are driven by the knife drive unit 100 via the knife drive shaft 27. The sewing machine body 11 is provided with a sewing needle 14 and a presser foot 15 as a sewing part 13.
[0021]
As shown in FIG. 2, the knife device 200 includes a moving knife 21, a fixed knife 22, a drive shaft 27 as a drive unit provided below the cloth feed surface 12 b (bed upper surface), and the drive shaft 27. And a moving knife moving mechanism 30 that reciprocates the moving knife 21 in a direction substantially perpendicular to the cloth feeding surface by transmitting the driving force of the moving knife 21. By performing the movement, the cloth is cut by cooperation with the fixed knife 22.
[0022]
The fixed knife 22 is provided with a blade portion at the upper end, and this blade portion is arranged so as to be substantially at the same position as the upper surface of the needle plate.
Further, the moving knife 21 includes a blade part 21a facing the fixed knife 22, an upper upper claw 21b for guiding the cloth to the blade part 21a, and a lower lower claw 21c. The upper claw 21b is provided at the tip of the blade portion 21a.
[0023]
  As shown in FIG. 2, the moving knife 21 is attached to a distal end portion 24 a of an arm 24, and a four-bar link that is a moving knife moving mechanism 30 provided below the sewing machine bed 12 via the arm 24. Thus, the moving knife 21 is configured to move. In addition, in FIG.Moving knife 21Is located at the lowest point, and cuts the cloth when rising from this position and descending downward from the highest point.
[0024]
The knife drive shaft 27 (see FIGS. 1 and 2) is on the cloth feeding direction (hereinafter referred to as X2 direction) side from the position where the fixed knife 22 is provided, and below the upper surface of the bed 12. In this embodiment, it is provided so as to extend in a direction orthogonal to the cloth feeding direction (X2 direction). The knife drive shaft 27 performs rotational reciprocation, and this driving force is transmitted to the moving knife 21 via the moving knife moving mechanism 30.
The knife driving shaft 27 is driven by a main shaft of the sewing machine, a rotary shaft or a swing shaft connected to the main shaft, and a motor separate from the driving of the sewing machine.
[0025]
The moving knife movement mechanism 30 includes an upper lever 32, a lower lever 34, and links 37 connected to the upper lever 32 and the lower lever 34, respectively. In addition, the connection position of the link 37, the upper lever 32, and the lower lever 34 is comprised so that a change is possible.
[0026]
The upper lever 32 is connected to the knife drive shaft 27, and the other end portion of the upper lever 32 is vertically oriented in the direction opposite to the cloth feeding direction (X1 direction) with the knife drive shaft 27 as a fulcrum. It is designed to swing.
[0027]
The lower lever 34 is attached to a support shaft 33 provided in the bed 12 inside 12a of the sewing machine main body 11 on one end side 34a so as to be rotatable about the support shaft 33.
[0028]
The link 37 is connected to the upper lever 32 at one end side 37a with the other end portion 32b of the upper lever 32 facing the X1 direction at the first connecting portion 35, and the lower end 34b is connected to the lower lever 34. The second connecting portion 36 is connected in a state where the other end portion 34b of the lower lever 34 faces the X2 direction.
In addition, a base 38 is formed on the link 37, and an arm 24 with the moving knife 21 attached to the distal end portion 24a is attached to the base 38 via a fixing member 39 such as a screw or a bolt nut. That is, the moving knife 21 reciprocates in the vertical direction with respect to the cloth feed surface by the movement of the link 37. In addition, a long hole for attaching a screw or bolt 39 is formed in the base 38 in the cloth feeding direction, and the arm 24 is moved to an arbitrary position by the screw 39 by sliding in the arrow Z direction. Accordingly, the position can be shifted in the cloth feeding direction (X2 direction) of the moving knife 21 of the distal end portion 24a of the arm 24 and the direction opposite to the cloth feeding direction (X1 direction).
[0029]
In the connecting portions 35 and 36, both end portions 37a and 37b of the link 37 are connected via eccentric pins 40 and 50 provided at the other end portions 32b and 34b of the upper and lower levers 32 and 34, as shown in FIG. The shafts are pivotally attached to the upper and lower levers 32, 34, and the shaft center position can be changed to the center points 40a, 40b, 40c, 50a, 50b, 50c in the figure by this eccentric pin. It is.
[0030]
The eccentric pin whose axial center position can be changed is configured as shown in FIG.
The eccentric pin is formed in each of the upper and lower levers 32 and 34, but here, the one provided in the upper lever 32 will be described.
[0031]
4A and 4B are diagrams for explaining a schematic configuration of the eccentric pin used in the connecting portion. FIG. 4A is a diagram illustrating the eccentric pin attached to the lever, and FIG. 4B is used in this example. It is a perspective view of an eccentric member.
[0032]
As shown in FIG. 4A, an opening 32c is formed at the other end of the upper lever 32, and an eccentric member 60 having an eccentric pin is fitted into the opening 32c.
As shown in FIG. 4B, the eccentric member 60 protrudes from a columnar base end portion 61 fitted into the opening 32 c and a location shifted from the center of the upper surface 61 a of the base end portion 61. The eccentric pin 40 is provided. The base end portion 61 of the eccentric member 60 is fitted into the opening 32c, and the side surface 61b of the base end portion 61 of the eccentric member 60 is screwed into a screw hole cut in the inner surface of the opening portion of the upper lever 32. It is fixed to the upper lever 32 by a set screw 63 or the like.
[0033]
That is, for example, the base end portion 61 is disposed so that the center position of the eccentric pin 40 is disposed at the center points 40a, 40b, and 40c in FIG. Fix it. Similarly, the lower lever 34 is provided with an eccentric pin that can change the axial center position. Thereby, the trajectory along which the link 37 moves can be arbitrarily changed.
[0034]
In addition, you may comprise as FIG. 5 as a modification of the eccentric pin which can change an axial center position. In addition, although this modification is provided in both the upper and lower levers 32 and 34, it demonstrates as what was provided in the upper lever 32 here for convenience.
[0035]
FIG. 5 is a view for explaining a modified example of the schematic configuration of the eccentric pin used in the connecting portion. FIG. 5A is a view for explaining an eccentric pin as a modified example attached to the lever. These are the back perspective views of the eccentric member used by this modification, (c) is a fragmentary sectional view of the connection part explaining the state where the eccentric member was attached to the upper lever. In the configuration of the eccentric pin shown in FIG. 5A, a long hole 65 is provided at a predetermined position of the end of the upper lever 32, and the eccentric member 70 is fitted and fixed in the long hole 65. .
[0036]
As shown in FIG. 5 (b), the eccentric member 70 is such that its fixed position can slide in the longitudinal direction of the long hole 65 in the long hole 65. It consists of a slide part 72 in which a male screw 74 is formed and a flange part 71.
The shaft portion 73 is fixed so that the link 37 does not come off from the projection 73 by connecting the link 37 rotatably at the center portion 73a and attaching an E ring 75 to the tip.
The slide portion 72 is fitted into the elongated hole 65 on the upper and lower surfaces, and the nut 76 is screwed onto the male screw 74 from the back surface of the upper lever 32, and the flange portion 71 is locked to the upper lever 32. It is fixed to the lever 32, and the axial center position of the eccentric pin can be changed by the position where the eccentric member 70 is fixed.
[0037]
In the moving knife moving mechanism 30 configured as described above, the knife drive shaft 27 moves by the movement transmitted from the drive shaft, and the upper lever 32 swings by the movement of the swing shaft. By the swinging of the upper lever 32, the link 37 whose one end 37a is connected to the upper lever 32 moves in the vertical direction, and follows this, and is rotatably provided with the fixed shaft 33 as a fulcrum. The lower lever 34 also swings up and down.
[0038]
In other words, the moving knife movement mechanism 30 causes the link 37 to reciprocate in the vertical direction, and the moving knife 21 reciprocates in the vertical direction together with the link 37. In the present embodiment, the upper and lower levers 32 and 34 are provided with the eccentric pins 40 and 50 in the respective connecting portions 35 and 36 so that the link 37 is rotatably connected. It is good also as a structure which provides the eccentric pins 40 and 50 in a part, and attaches the up-and-down levers 32 and 34 to this link 37 rotatably.
[0039]
Next, the movement when the axial position where the link 37 is rotatably attached is changed will be described with reference to FIGS.
FIG. 6 is a schematic side view showing the positional relationship between the moving knife, the link, and the upper and lower levers in the knife device of the present embodiment.
[0040]
In FIG. 3, for example, when the center positions of the eccentric pins 40 and 50 are set to the positions of the center points 40b and 50b, the sewing machine female device 200 according to the present embodiment moves as shown in FIG. I do. That is, when the upper lever 32 is swung by the knife drive shaft 27, the link 37, which is transmitted this movement via the eccentric pin at the center point 40b, moves along a track as shown in FIG. When the knife 21 cuts the cloth with the fixed knife 22, that is, when it moves downward, a component of movement in the cloth feeding direction (X2 direction) is generated, and a fulcrum is provided on the operator side in FIG. The same movement as that of the moving knife provided with is performed.
[0041]
Therefore, the blade portion moves in the direction in which the cloth to be fed is drawn, that is, in the X2 direction, and cuts the cloth. Therefore, when the cloth is cut in a left turn, the wrinkle can be absorbed and cut appropriately.
[0042]
  Further, when the center positions of the eccentric pins 40 and 50 are set to the center points 40c and 50c, respectively, the female knife device 200 of the sewing machine according to the present embodiment performs a motion as shown in FIG. That is, when the upper lever 32 is swung by the knife drive shaft 27, the link 37 moves along a track as shown in FIG. 6B, whereby the moving knife 21 cuts the cloth with the fixed knife 22. In other words, when the moving knife 22 moves downward, the direction opposite to the cloth feeding direction(X1 direction)The movement component is generated, and the same movement as that of the moving knife provided with the fulcrum on the side opposite to the worker in FIG. 8A is performed.
[0043]
Therefore, the knife cuts the cloth to be fed so as to repel, so that it is preferable that the knife is not sewn in a stretched state when cutting to the right bend.
[0044]
Further, by adjusting the positions of the eccentric pins 40 and 50 in this way, the trajectory of the movement of the link 37 is changed, and if the positions of the centers of the eccentric pins 40 and 50 are the center points 40a and 50a, respectively, As shown in FIG. 6C, the link 37 moves in a substantially vertical direction, and the movement of the link 37 causes the moving knife 22 to reciprocate substantially vertically with respect to the cloth feed surface.
With the change of the axial position of the upper and lower levers 32 and 34, the position of the moving knife 21 attached to the link 37 is shifted in the cloth feeding direction (X2 direction) or the opposite direction (X1 direction). However, this deviation can be suitably achieved by adjusting the fixing member 39 that fixes the base end portion 21b of the moving knife 21 to the base 38 in the Z direction (see FIG. 2).
[0045]
According to the female knife device of the above-described embodiment, the link 37 is reciprocated in the vertical direction by the moving knife moving mechanism 30 that is a four-bar link moved by the drive shaft 27, and is fixed thereto. The moving knife 21 also reciprocates in the vertical direction, and the cloth on the cloth feed surface 12 b can be cut with the fixed knife 22. In addition, since the connecting position between the link 37 and the upper and lower levers 32 and 34 can be changed by the eccentric pins 40 and 50, the change of the connecting position changes the trajectory of the link 37 from the vertical as described above. It can be changed to a state tilted in a predetermined direction. Therefore, by changing the connecting position, the moving direction of the moving knife 21 can be adjusted from a state inclined in the cloth feeding direction (X2 direction) to a state inclined in the opposite direction (X1 direction) to the cloth feeding direction.
[0046]
That is, by setting the centers of the eccentric pins attached to the upper and lower levers 32 and 34 as the center points 40a and 50a, even when the sewing route is a right turn or a left turn, the cloth is particularly jammed or the cloth is pulled. Therefore, a moderate cutting can be performed. If the cloth is often cut to the right, the cloth sent to the cloth feed surface 12b is inclined by tilting the reciprocating motion of the moving knife 21 in the cloth feed direction (X2 direction). The moving knife can be provided so as to draw a trajectory in the direction of pushing back, and the cloth can be cut efficiently and suitably. Furthermore, when cutting the cloth in a left turn, the trajectory that draws the cloth is drawn by inclining the reciprocating motion direction of the moving knife 21 in the direction opposite to the cloth feeding direction (X1 direction). The cloth can be cut efficiently and suitably.
[0047]
In the above embodiment, the drive shaft for driving the four-bar link is connected to one end of the upper lever, and the lower lever is rotatably attached to the fixed shaft. However, the present invention is not limited to this, and the fulcrum of the lower lever may be a swing shaft connected to the drive shaft, and the fulcrum of the upper lever may be a support shaft fixed inside the bed.
[0048]
【The invention's effect】
  As described above, according to the female knife device of the sewing machine according to the invention of claim 1,The following effects can be obtained.
[0049]
  Claim 1According to the knife device of the sewing machine according to the invention described above, the reciprocating direction of the moving knife is changed and adjusted by the moving knife moving mechanism from the direction inclined in the cloth feeding direction to the direction inclined in the opposite direction to the cloth feeding direction. Therefore, even if the sewing route is a right turn or a left turn, the movement direction of the moving knife is adjusted so as to perform cutting suitable for the bending state of the sewing route by the adjustment using the adjusting means. Can be changed. In other words, when cutting the cloth to the right, the moving knife draws a trajectory in the direction of pushing back the cloth sent to the cloth feeding surface by tilting the reciprocating direction of the moving knife in the cloth feeding direction. The cloth can be cut efficiently and suitably. Also, when cutting the cloth in a left turn, the reciprocating direction of the moving knife is inclined in the direction opposite to the cloth feeding direction, so that it is efficiently suitable to draw a track that pulls in the cloth. Can cut the cloth.
[0050]
  Further claim 1According to the female knife device of the described invention, the four-bar link that moves by the drive shaft causes the link to reciprocate in the vertical direction, and the moving knife fixed thereto also reciprocates in the vertical direction. The cloth on the cloth feeding surface can be cut. In addition, since the connection position between the link and the first and second levers is formed to be changeable, the link trajectory is tilted in a predetermined direction from a vertical one by changing the connection position. Can be changed. Accordingly, by changing the connecting position, the moving direction of the moving knife can be adjusted from a state inclined in the cloth feeding direction to a state inclined in the direction opposite to the cloth feeding direction.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an example of a sewing machine main body to which a female sewing machine device according to the present invention is applied.
2 is a side view showing an example of the female knife device of the sewing machine according to the present invention in FIG. 1; FIG.
3 is an enlarged side view showing a moving knife movement mechanism which is a link mechanism for transmitting movement to the moving knife in FIG. 2; FIG.
4A and 4B are diagrams for explaining a schematic configuration of an eccentric pin used in a connecting portion, wherein FIG. 4A is a diagram illustrating an eccentric pin attached to a lever, and FIG. 4B is used in this example; It is a perspective view of an eccentric member.
FIG. 5 is a diagram for explaining a modification of the schematic configuration of the eccentric pin used in the connecting portion, and (a) is a diagram for explaining the eccentric pin as a modification attached to the lever; ) Is a rear perspective view of an eccentric member used in this modification, and FIG. 5C is a partial cross-sectional view of a connecting portion for explaining a state where the eccentric member is attached to the upper lever.
FIG. 6 is a schematic side view showing a positional relationship between a moving knife, a link, and an up / down lever in the knife device of the present embodiment.
FIG. 7 is a view of a needle plate of a conventional sewing table as viewed from above.
FIG. 8 is a side view of a conventional scalpel device arranged below the sewing table of the sewing machine, and FIG. ) Is a side view of an example of the movement mechanism of the knife when the hook described above is arranged on the side opposite to the worker.
FIG. 9 is a plan view of a cloth sewn by a sewing machine.
[Explanation of symbols]
12 beds
12b Bed top surface (cloth feed surface)
21 Moving knife
22 Fixed knife
23 needle plate
30 Moving knife movement mechanism
27 Female drive shaft (drive unit)
32 Upper lever (first lever)
33 Support shaft
34 Lower lever (second lever)
38 foundation
40, 50 eccentric pin
200 female device

Claims (1)

A fixed knife provided facing the cloth feed surface;
A moving knife that cuts the cloth by sandwiching the fixed knife and the cloth;
A drive unit provided on the lower side of the cloth feed surface;
A moving knife moving mechanism that transmits the driving force of the driving unit to reciprocate the moving knife up and down with respect to the cloth feed surface ;
Provided with the moving knife movement mechanism , comprising an adjusting means capable of changing the movement direction of the moving knife from a state inclined in the cloth feeding direction to a state inclined in the direction opposite to the cloth feeding direction ,
The drive unit is a drive shaft that reciprocates around an axis,
The moving knife movement mechanism is connected to the drive shaft and has a first lever whose one end swings up and down with respect to the cloth feed surface, and a second lever which is connected to be rotatable about an arbitrary fulcrum. A four-bar link comprising a lever and a link connected to each of the first lever and the second lever;
The adjustment means is configured to be able to change a connection position between the link and the first lever and the second lever;
The moving knife is fixed to the link, knife device of a sewing machine, characterized in that reciprocates in the vertical direction with respect to the cloth feeding surface by movement of the link.

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