JP3899208B2 - Sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a new type vertical hook (a hook body) that can mount a bobbin case with a built-in bobbin thread bobbin to a center hook from the hook shaft side instead of the hook front side.
[0002]
[Prior art]
The conventional vertical hook of the sewing machine is a type in which the lower thread bobbin or the bobbin case with a built-in bobbin is attached to the middle hook from the so-called front side of the hook.
[0003]
[Problems to be solved by the invention]
In the case of a two-needle sewing machine, each vertical hook fixed to each hook shaft and facing each other corresponds to the two sewing needles and is placed close to each other, and there is almost no gap between each hook. The bobbin could not be exchanged until the gap between them was increased by taking measures such as adopting a structure in which one hook could be moved. However, as a two-needle sewing machine, a machine using a horizontal hook in which a lower thread bobbin can be easily mounted is generally used. However, the horizontal hook is provided with an opener that is fixed to the lower part of the sewing machine bed to stop the inner hook from rotating non-rotatingly and operates so that the upper thread loop can be easily removed. Is attached to the eccentric part of the shuttle shaft via a link and a guide arm, and has the following disadvantages and is avoided. The disadvantages are that the opener hits the hook inside the sewing machine and the vibration noise due to the eccentric of the hook shaft is high, that high-speed operation is not possible, and the difference in twisting due to the difference in the direction of the hook loop of the upper thread loop. Cause unevenness of the stitches, poor thread tightening, and expensive spiral gears for transmitting power from a horizontally disposed lower shaft to a vertically disposed hook shaft.
[0004]
The double-head sewing machine is intended to increase the production efficiency of large sewing products such as futons, sheets, towel towels, etc., and two lockstitch sewing machines are arranged on both sides of the sewing table that are perpendicular to the direction of the sewing product. However, in the case of the double-head sewing machine, each open / close lid for attaching and replacing the lower thread bobbin to the inner hook of the vertical full rotation hook from the hook front side is Since it is hidden under the sewing product, it is difficult to open and close when replacing the bobbin.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vertical hook (hook) of a sewing machine that can be easily attached to and replaced with a lower thread bobbin or a bobbin case with a built-in lower thread bobbin.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides
A hook mounting base fixed to the end of the hook shaft on the sewing needle side and having an opening;
  A hook provided at the end of the hook mounting base on the sewing needle side,
  A guide member slidably provided on the hook shaft;
  A bobbin case mounting base body which is guided by a guide member and moves forward and backward with respect to the inner hook;
The body has a slide plate that protrudes toward the hook and moves up and down,
Provided with a pair of flanges contacting and separating in a direction perpendicular to the sliding direction of the slide plate, the bobbin case is provided with a held member to be held when the pair of flanges approach,
The bobbin case is mounted on the bobbin case mounting base body by inserting the held member from above between a pair of flanges and the pair of flanges sandwiching the held member, and removing the slide plate ascending. As a result, the bobbin case is raised and the pair of collars are separated from each other.
  Further, as described in claim 2,
A hook mounting base fixed to the end of the hook shaft on the sewing needle side and having an opening;
  A hook provided at the end of the hook mounting base on the sewing needle side,
  A guide member slidably provided on the hook shaft;
  A bobbin case mounting base body which is guided by a guide member and moves forward and backward with respect to the inner hook;
The body has a push-up plate that protrudes toward the hook and moves up and down,
A pair of slide pin bases that have flanges that are in contact with and away from each other in a direction perpendicular to the direction of movement of the push-up plate and are biased toward each other;
  In addition to providing a vertical slide base that can slide in the vertical direction,
  The bobbin case is provided with two wide grooves which are parallel parts whose lower ends are close to each other and whose upper part gradually opens outward from each other and whose upper part is parallel.
The bobbin case is attached to the bobbin case mounting base body by moving the bobbin case so that the pair of slide pin bases in the approaching state enter the lower end of the wide portion, and the pair of slides by the lowering of the bobbin case. It is done by gradually opening the pin base along the wide groove and pinching it at the top of the wide groove.
To remove, open the pair of slide pin bases by lowering the upper and lower slide bases, raise the push-up plate to raise the bobbin case, and then move the pair of slide pin bases closer by returning the upper and lower slide bases upward. The bobbin case is raised by pressing the portion below the parallel portion of the wide groove.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
With reference to the drawings, an embodiment in which the shuttle of the present invention is applied to a two-needle sewing machine will be described. Although two examples of the bobbin case mounting base constituting the hook body are presented, there is no great difference in the fundamental functions, and members having the same functions are described with the same reference numerals. The symbols are K for the hook body, A for the hook, B for the hook mounting base, C for the bobbin case mounting base, D for the bobbin case, E for the bobbin bobbin, and S for the hook shaft. Each detail member is accompanied by a numeral or a lowercase letter of Roman letters as a branch number. The other members are directly numbered.
[0013]
The overall schematic configuration will be described with reference to FIG.
[0014]
As shown in Fig. 1 (1), the two-needle sewing machine has two outer hook sword tip positions corresponding to the positions of the two sewing needles 1 and 1 'that move up and down as the upper shaft rotates. The hook bodies K and K ′ are arranged in a sewing bed (not shown). Since each hook body K, K ′ has a plane symmetrical structure, the explanation will focus on the right hook body K. Note that the reference numerals of the members constituting the left hook body K ′ are distinguished by adding “′” to the reference numerals of the constituent members of the right hook body K.
[0015]
The hook body K is fixed to the end of the hook shaft S and has a hook mounting base B having an opening Ba, a hook A provided at an end far from the hook shaft S, and a slide in the center of the hook shaft S. A bobbin case mounting base C which is fixed to a slide shaft C1 as a guide member which is arranged and is accommodated in the opening Ba of the hook mounting base B, and a bobbin case D which is accommodated in the inner pot of the hook A It has become more. The opening Ba of the hook mounting base B includes a bobbin case D containing a bobbin thread bobbin E (see FIG. 3 (4)) (including a so-called bobbin-less bobbin with a core removed after winding). It is for attaching to the inner pot A2 that constitutes. A gear 2 for rotating the hook body K is fixed to the hook shaft S.
[0016]
With reference to FIGS. 1 (2) to 1 (5), the structure of the hook A will be described.
[0017]
The hook A includes an annular outer hook A1 that is open at the front and rear and is integrally attached to the hook mounting base B by screws B8, and an annular inner hook A2 that is rotatably supported therein. As in the prior art, the outer hook A1 rotates during sewing, and the inner hook A2 does not rotate.
[0018]
The inner hook A2 is provided in a free state so that the ball A2a protrudes inside the annular portion. That is, the annular portion is formed with a tapered hole A2b that gradually decreases in diameter from the outside to the inside (FIG. 1 (5)), the tapered hole A2b has a larger diameter than the minimum diameter of the tapered hole A2b, In addition, a ball A2a having a diameter that partially protrudes inside the annular portion is inserted. The ball A2a is fitted into a later-described recess D2i (FIG. 3 (1)) on the outer periphery of the bobbin case when the bobbin case is inserted, and plays a role of holding the bobbin case D in the inner hook A2. The ball A2a is in pressure contact with a ball retainer A2d made of a leaf spring fixed to the outside of the annular portion by a screw A2c. Further, a guide pin A2e serving as a positioning member for the inner hook A2 when the bobbin case D is inserted projects from the inside of the annular portion of the inner hook A2.
[0019]
Next, an overview of the hook mounting base B will be described with reference to FIGS.
[0020]
The hook mounting base B is fixed to the hook shaft S by a screw B1. A portion of the hook mounting base B excluding the hook shaft S side base (substantially disk-like upright wall portion on the side fixed to the hook shaft S) has a semi-cylindrical shape and forms an opening Ba. The flat part around the upper part of the base part includes a bobbin case guide B2 for guiding a held member D1e (described later) of the bobbin case D when the bobbin case D is inserted into the opening Ba, and a lower part of the bobbin case D. A push plate spring B3 acting so as to approach the main body is fixed together by a screw B4 so as to protrude toward the opening Ba. Further, one end of the claw opening plate B5 is fixed to the outer side of each edge of the opening Ba by a screw B7.
[0021]
The claw release plate B5 as the release member is made of a leaf spring and is in a free state except for the screwing portion. This claw release plate B5 is provided with a claw on both sides of the bobbin case mounting base C, which will be described later, immediately before the central hook A2 when the bobbin case mounting base C is brought close to the central hook A2 when the bobbin case D is attached to the central hook A2. In order to move C8 to the outside, a crest B5a acting on the lower part C8b1 of the knob C8b of the claw C8 is provided (FIG. 1 (1)).
[0022]
The bobbin case mounting base C will be described with reference to FIG. 2 (2) and 2 (3) show a state in which lids C11 and C12 described later are removed, respectively.
[0023]
The bobbin case mounting base C is for facilitating mounting and replacement of the bobbin case D with the bobbin thread bobbin E (see FIG. 3 (4)) on the inner hook A2. The main body C0 is fixed to the front end of the slide shaft C1 by screwing the screw portion at the front end of the slide shaft C1, which is a guide member, into a screw hole at the center portion of the lid C12 to be described later and further tightening the nut C20. Further, as shown in FIG. 1 (2), a slide shaft spring C2 surrounding the slide shaft C1 is accommodated inside the hook shaft S on the opposite side of the mounting base body mounting portion of the slide shaft C1. The end of the shaft spring C2 is in contact with a slide shaft guide C3 fixed to the slide shaft C1 with a screw C4. The slide shaft guide C3 plays a role of preventing the slide shaft C1 from tilting at the same time as compressing the slide shaft spring C2 when the main body C0 slides toward the hook A side.
[0024]
The main body C0 of the bobbin case mounting base C has a substantially short cylindrical shape and is fixed to the slide shaft C1 so that the surfaces on both sides are vertical. A movement knob C5 is fixed to the upper part of the peripheral wall of the main body C0 by a screw C6, and a slide plate C7 bent in an L shape is supported on the hook side surface so as to be slidable in the vertical direction. A pair of claws C8 and C8 are opposed to each other and supported so as to be movable in the horizontal direction. Further, on the surface of the hook shaft side, the lock plate C9 for locking the slide plate C7 at the lowest position and the locked state are opened. An unlocking plate C10 is provided. Further, the hook side surface and the hook shaft side surface of the main body C0 are covered with a lid C11 and a lid C12, respectively, and the above-mentioned members and attached members are protected by the lids C11 and C12.
[0025]
The slide plate C7 includes a vertical plate portion C7a that is slidably accommodated in the vertical direction on the hook side of the main body C0, and a horizontal plate portion C7b that protrudes toward the hook side from the lower end of the vertical plate portion C7a. As shown in FIG. 2 (2), the vertical plate portion C7a is composed of a narrow upper portion C7e and a wide lower portion C7d, and an inclined portion C7e is formed at the boundary. The edge of the vertical plate portion C7a functions as a cam for each claw C8. A slide plate pin C13 extending to the hook shaft S side surface and slightly protruding therefrom is fixed to the back side of the vertical plate portion C7a. The slide plate pin C13 is inserted into a long hole C0a extending in the vertical direction penetrating the main body C0, and is urged upward by a slide plate spring C15 having one end fixed to the main body C0 by a screw C14. . Accordingly, the slide plate C7 is also urged upward in the same manner.
[0026]
The claw C8 is accommodated on the hook side of the main body C0 so as to be slidable in the horizontal direction. It is composed of a knob portion C8b protruding in the vertical direction from the tip of the portion C8c. The claws C8 are urged in an inner direction facing each other by a claw spring C16. Due to the urging force of the claw spring C16, the bobbin case D riding on the slide plate C7b is clamped to the flange C8a.
[0027]
The lock plate C9 is accommodated so as to be slidable between a position where the tip inclined obliquely from the upper right to the lower left protrudes into the long hole C0a and a position where the lock plate C9 moves backward in the horizontal direction. A pin C17 protrudes from the lock plate C9 and is inserted into a long hole C10a described later of the lock release plate C10.
[0028]
The unlocking plate C10 is accommodated in the main body C0 so as to be slidable in the vertical direction on the shuttle shaft S side, and its upper end is exposed to the outer peripheral portion so that it can be pushed with a finger from above. The lock release plate C10 is biased upward by a release plate spring C19 having one end fixed with a screw C18. Further, the lock release plate C10 is provided with a long hole C10a that runs diagonally from the upper right to the lower left, and the pin C17 fixed to the lock plate C9 is inserted into the long hole C10a as described above. Yes. Therefore, the pushing-up force of the release leaf spring C19 acting on the lock release plate C10 acts as a horizontal component force on the pin C17 through the long hole C10a, and the lock plate C9 is applied in the direction desired by the tip portion to the long hole C0a. Be forced. Therefore, the slide plate pin C13 when it is at the lowermost portion of the long hole C0a is reliably held at a fixed position even though it is biased upward by the slide plate spring C15.
[0029]
The lid C11 is fixed to the main body C0 by screws C21 together with left and right guide plates C22 for guiding a held member D1e described later of the bobbin case D. The lid C12 is fixed to the main body C0 with a screw C23.
[0030]
Next, the bobbin case D will be described with reference to FIGS. 3 and 4.
[0031]
The bobbin case D is composed of two main body members D1 and D2. The first main body member D1 that functions as a conventional bottom portion of the hook (guide when the needle thread passes through the inner hook) is a member that accommodates the second main body member D2 in which the lower thread bobbin E is accommodated. Is provided with a shaft portion D1a that can rotate the bobbin bobbin E, and a coil spring D1d housed inside the shaft portion D1a and a latch D1b that holds the posture by a spacer D2i are provided at the tip of the shaft portion D1a. Yes. The second main body member D2 is integrated by covering the first main body member D1 and tilting the latch D1b.
[0032]
As shown in FIG. 3 (1), the second main body member D2 has a recess D2i and a groove at positions corresponding to the fixed ball A2a and the positioning guide pin A2e provided on the inner hook A2, as shown in FIG. D2j is formed.
[0033]
A held member D1e for holding the bobbin case D by the pair of flange portions C8a and C8a of the bobbin case mounting base body C0 is provided on the bottom surface of the first main body member D1. The held member D1e is wide enough to be held by the pair of flange portions C8a and C8a, and is continuously formed up and down.
[0034]
A thread take-up spring D2a curved in a semicircular shape is fixed to the bottom surface of the second main body member D2 by a set screw D2e, and a plate-like lower thread tension spring D2c substantially along the curved surface is provided on the peripheral side portion. The lower thread holding plate D2d is fixed by a set screw D2f. The thread take-up spring D2a is for forcibly pulling up and releasing it to the sword tip side of the outer hook A1 when the lower thread Y held between the thread tension spring D2c and the lower thread holding plate D2d is released. It is. The screw D2g is for adjusting the pressing force of the thread take-up tension spring D2c.
[0035]
4 (1) shows the path of the lower thread Y in the bobbin case D. FIG. 4 (2) shows the lower thread clamp part (thread tension spring D2c, lower thread holding plate D2d) in FIG. Is seen from. A bobbin bobbin is rotatably accommodated in the bobbin case D, and the bobbin thread Y that is unwound from the bobbin bobbin passes through the narrow groove of the second main body member D2, and reaches the end D2c2 of the bobbin thread tension spring D2c. The thread is passed through the lower side, and further threaded on the tip D2a1 of the thread take-up spring D2a, and then passed through the thread hooking part D2h of the second body member D2, and is sandwiched between the thread tension spring D2c and the lower thread holding plate D2d. The thread tension spring D2c is cut at the thread trimming portion D2c1. The lower thread Y in the bobbin case D is finally cut by the thread trimming portion D2c1 through the above-described yarn path, so that the lower thread Y having a predetermined length is always drawn out from the bobbin case D.
[0036]
FIG. 4 (4) is a view of the inner hook A2 portion through which the lower thread holding plate D2d passes when the bobbin case D is pushed into the inner hook A2, that is, when the cross section of FIG. 4 (3) is viewed in the direction of the arrow. It is. A mountain-shaped cam portion A2f is formed at that portion. When the bobbin case D is pushed into the inner hook A2, the tip of the lower thread holding plate D2d advances along the dotted line, and the bending of the lower thread holding plate D2d is maximized at the top of the cam portion A2f. The lower thread Y sandwiched between is released. This lower thread release time is immediately before the bobbin case D is held by the inner hook A2 by the ball A2a. When the bobbin case D is further pushed into the intermediate hook A2, the lower thread holding plate D2d returns to the state shown in FIG. 4 (2). At this point, the bobbin case D is held in the inner hook A2 by the ball A2a. The released lower thread Y is repelled by the return force of the lower thread take-up spring D2a, is released from the tip of the lower thread take-up spring D2a and the thread hooking portion D2h, and is released in front of the hook A.
[0037]
Next, a procedure for mounting the bobbin case D in which the bobbin thread bobbin E is installed in the inner hook A2 will be described with reference to FIGS.
[0038]
First, a state before the bobbin case D is mounted will be described. As shown in FIG. 7 (3b), the slide plate C7 is in the raised position by the force of the slide plate spring C15, and as shown in FIG. 7 (3a), the claw C8 has a collar C8a that is a wide portion of the vertical plate C7a. It is in the open state.
[0039]
Then, as shown in FIG. 6 (2), the guided member D1e is guided along the left and right bobbin case guides B2 while the bobbin case D is placed on the horizontal plate part C7b of the slide plate C7 (FIG. 1)). At that time, the held member D1e passes between the bobbin case guide B2 and enters between the collars C8a of the claws C8 as shown in FIG. 6 (3). At this time, since the two flange portions C8a are in an open state, the held member D1e can be clamped by the flange portion C8a.
[0040]
Here, although in the middle of the description of the bobbin case mounting procedure, a trouble that occurs when the bobbin case guide B2 and the push plate spring B3 are not provided will be described with reference to FIG.
[0041]
Normally, before setting the bobbin case D, the lock release plate C10 is pushed to raise the slide plate C7. As shown in FIG. 8 (3), if the bobbin case guide B2 is not provided, an operation error, etc. When the bobbin case D is inserted with the slide plate C7 lowered, the claw C8 may be closed and the bobbin case D is often not clamped. In this case, even if it is attempted to lift with the slide plate C7, it is often not lifted, and it takes a considerable time to take out the bobbin case D.
[0042]
On the other hand, when the bobbin case guide B2 is provided, as shown in FIG. 8 (1), the bobbin case D is prevented from entering at three points a, b, and c. 8 (3) has no bobbin case guide B2 and is disengaged from the blocking element, so that the bobbin case D falls down when it is tilted. Therefore, it can be said that the bobbin case guide B2 has both a guide function to the collar portion C8a of the held member D1e and a malfunction prevention function when the slide plate C7 is raised and the claw C8 is open.
[0043]
In addition, as shown in FIG. 8 (4), when the push plate spring B3 is not provided, there is no problem if the bobbin case D is pushed straight down, but the lower part is inclined to the hook side. When pushed in the state, the flange C8a of the claw C8 may not clamp the held member D1e of the bobbin case D.
[0044]
However, as shown in FIG. 8 (2), if there is a push plate spring B3 whose tip portion slightly protrudes toward the hook A side, the push plate spring B3 is in a state of lightly pushing the upper part of the bobbin case D. Case D is tilted. At this time, the lower part of the bobbin case D rotates with the a part as a fulcrum and comes into contact with the bobbin case mounting base C, and the hook part C8 of the claw C8 enters the armpit of the held member D1e of the bobbin case D. When the bobbin case D is pushed downward as it is, the push plate spring B3 is detached from the bobbin case D. At this time, since the collar portion C8a has already started clamping the held member D1e, it cannot be removed any more. Absent. Instead of the push plate spring B3, as shown in FIG. 8 (5), even if a magnet C24 is provided in the vicinity of the raised position of the slide plate C7, the lower portion of the bobbin case D being set is placed on the bobbin case by the magnet C24. Since it is attracted to the mounting base C, it is possible to prevent the inclination of the lower part toward the hook side. Even if the bobbin case guide B2 and the push plate spring B3 are not provided, the same effect can be expected even if the opening Ba of the hook mounting base B has a marginal width with no room for tilting the bobbin case D. In that case, it is preferable to adjust the width of the opening Ba by providing a spacer whose position can be adjusted in the hook shaft direction.
[0045]
As described above, after the bobbin case D is correctly placed on the horizontal plate portion C7b of the slide plate C7, as shown in FIGS. 7 (4a) and 4b, the bobbin case D is pushed downward (FIG. 5 (2 )). By this operation, the slide plate C7 and the slide pin C13 slide downward and move to the lowest point while pushing the lock plate C9 outward. When the slide plate C7 is lowered to the fixed position, the lock plate C9 returns to the inside, and the slide pin C13 is held below the lock plate C9. Further, by the pushing operation of the bobbin case D, the contact position of the vertical plate part C7a with the claw hook part C8a moves from the wide part to the narrow part, and the hook parts C8a are closed to each other by the force of the return spring C16. By the operation of closing the collar C8a, the held member D1e is locked and the bobbin case D is held as shown in FIG. 7 (5).
[0046]
Next, holding the moving knob C5 of the bobbin case mounting base C, the bobbin case D is slid toward the inner hook A2. As shown in FIG. 5 (4), when the lower part C8b1 of the knob part C8b of the claw C8 reaches the peak part B5a of the claw release plate B5, the hook parts C8a on both sides move outward to open, and the bobbin case D is opened. To do. This opening is performed immediately before the bobbin case D is inserted into the inner hook A2, thereby providing a degree of freedom to absorb the deviation of the axial position caused by the dimensional error of each component. Therefore, the subsequent insertion into the inner pot can be easily performed with a light force.
[0047]
When the bobbin case D together with the bobbin case mounting base C is pushed into the inner hook A2, as shown in FIG. 5 (3), the ball A2a of the inner hook A2 enters the recess D2i of the bobbin case D, and the bobbin case D moves into the inner hook A2. The lower thread is released to the tip of the outer hook A1. At this time, since the slide shaft spring C2 is compressed and a return force is applied to the slide shaft C1, the bobbin case mounting base C returns to the original position only by releasing the hand (5). A series of bobbin case mounting operations are thus completed. In this state, the bobbin case mounting base C does not fly out to the shuttle while the sewing machine is operating due to the force of the slide shaft spring C2.
[0048]
The procedure for removing the bobbin case D attached to the inner hook A2 when replacing the lower thread bobbin is as follows.
[0049]
The slide plate C7 (horizontal plate portion C7b) is lowered and the bobbin case mounting base C at the standby position on the hook shaft S side (FIG. 5 (5)) is slid toward the inner hook A2. At this time, when the lower part C8b1 of the knob part C8b of the claw C8 reaches the peak part B5a of the claw release plate B5 (FIG. 5 (4)), each claw C8 moves outward and opens.
[0050]
Further, when the bobbin case mounting base C is pushed into the inner hook A2, the collar portions C8a of the claws C8 are positioned on both sides of the held member D1e of the bobbin case D. In this state, when each knob portion C8b is pinched against the elastic force of the claw release plate B5, the held member D1e is sandwiched by the flange portions C8a.
[0051]
When the bobbin case mounting base C is moved backward while the knobs C8b are pinched, the bobbin case D is pulled out from the inner hook A2. When the bobbin case mounting base C is retracted to the standby position on the hook shaft S side, the finger is released from the knob C8b (FIG. 5 (2)). At this time, the collar C8a of the claw C8 is applied with the force of the return spring C16. In this case, the clamped state is maintained.
[0052]
When the lock release plate C10 is pressed at that position, the slide plate C7 rises and at the same time the pawl C8 is opened (Fig. 5 (1), Fig. 7 (2a) (2b), (3a) (3b)), sewing machine bed The bobbin case D can be easily removed from the upper surface.
[0053]
Next, a modification of the bobbin case mounting base C will be described with reference to FIG. Although the bobbin case mounting base C has been greatly changed in the main body C0 as described above, the relationship with other parts, for example, the hook shaft S, etc. is not changed, so only the changed points will be described here. To do.
[0054]
The hook mounting base B is not provided with the claw release plate B5 in the previous example.
[0055]
A knob guide plate C25 is fixed to both sides of the peripheral wall of the main body C0 by screws C26, and a push-up plate C27 bent in an L-shape at the center of the lower part can slide vertically on the hook side surface. A pair of slide pin bases C28 and C29 are supported in the middle part so as to be movable in the horizontal direction, and a vertical slide base C30 is supported in the upper center so as to be slidable in the vertical direction. ing. And the lid | cover C31 is being fixed to the surface by the side of the hook with the screw | thread C32, The said each member and attached member are protected by the lid | cover C31.
[0056]
The knob guide plate C25 has a knob part C25a whose upper part protrudes upward, and its lower part protrudes horizontally to become a guide part C25b. The guide portion C25b is in a positional relationship in contact with the edge of the opening Ba of the hook mounting base B, and functions as a detent for the main body C0 when the bobbin case mounting base C is moved in the hook shaft S direction.
[0057]
On the hook shaft side at the bottom of the push-up plate C27, a push-up plate pin C33 extending to the surface of the main body C0 hook shaft side is projected. The push-up plate pin C33 is inserted through a long hole C0b extending in the vertical direction that penetrates the main body C0.
[0058]
As shown in Fig. 9 (4), there are two mounting levers C34 and C35 on the hook shaft side, and two mounting levers C37 and C38 on the hook side. Each is pivotally attached by an E-ring C36 to form a so-called four-bar link. The left and right connecting portions are slidable by engaging with guide grooves formed in the horizontal direction on the main body C0. Furthermore, return springs C39 and C40 that are compressed inward are provided at the left and right connecting portions, respectively. Accordingly, the push-up plate pin C33 and the push-up plate C27 at the connecting portion of the mounting base levers C34 and C35 are urged downward, and the connecting portion of the mounting base levers C37 and C38 are urged upward. Yes.
[0059]
The push-up plate pin C33 protruding from the push-up plate C27 also serves as a pin for the connecting portion of the mounting base levers C34 and C35.
[0060]
On the opposing semi-cylindrical bases of the slide pin bases C28 and C29, flanges C28a and C29a projecting outward from the lid C31 are formed. A slope C28a1 (C29a1) is formed at the upper end of the flanges C28a and C29a as shown in FIG. 9 (6). Further, when the bobbin case D is removed, the inner upper parts C28a2 and C29a2 of the collar parts C28a and C29a release their fingers from the upper and lower slide table C30, and when the collar parts C28a and C29a approach the inside by the force of the return springs C41 and C42, The curved surface is smooth so as not to get caught in a wide groove D1f described later. The slide pin bases C28 and C29 are biased inwardly toward each other by return springs C41 and C42 provided at the respective bases.
[0061]
The upper part of the upper and lower slide base C30 is an operation part C30a that is bent horizontally on the hook shaft side so that it can be easily pushed by a finger. A steep slope C30b is formed outside the bent portion. A return spring C44 is provided between the operation unit C30a and the main body C0 via a spring guide pin C43. On the other hand, an elongated hole C45 extending in the vertical direction is provided in the vertical portion C30c of the upper and lower slide table C30, and a stopper pin C46 fixed to the main body C0 is engaged with the elongated hole C45. Therefore, the vertical slide base C30 is normally in an upper position in a state where the lower end portion of the long hole C45 is in contact with the stopper pin C46. Note that C47 in FIGS. 9 (6) and 10 (3) is a bolt for attaching the main body C0 to the guide shaft C1.
[0062]
On the bottom surface of the first main body member D1 constituting the bobbin case D, two wide grooves D1f having a width larger than the outer diameter of the flange portions C28a and C29a of the slide pin bases C28 and C29 are provided. The lower part of each wide groove D1f is in a positional relationship where slide pin bases C28a and C29a that are in an approaching state when the bobbin case D is set to the main body C0 when the bobbin case D is attached to the inner hook A2, The upper part opens gradually toward the outside, and the upper part is a parallel part D1f1 parallel to each other. The upper end of the wide groove D1f is in a positional relationship such that the upper ends of the flange portions C28a and C29a hit when the bobbin case D is set on the main body C0. Note that the dotted lines in the wide groove D1f in FIG. 10 (1) indicate the positions of the collars C28a and C29a when the vertical slide base is lowered to the lowest point when the bobbin case D is removed.
[0063]
Finally, a procedure for mounting the bobbin case D to the inner hook A2 with the bobbin thread bobbin E by the bobbin case mounting base C will be described.
[0064]
First, when the upper part of the hook body K is opened and the bobbin case D is moved downward from above the main body C0 so that the set surface of the first main body member D1 is in contact with the inclined surface C30b of the upper and lower slide base C30, The set surface of the main body member D1 comes into contact with the inclined surfaces C28a1 and C29a1 at the tips of the slide pin bases C28a and C29a. Then, the flange portions C28a and C29a enter the lowermost portion of the wide groove D1f of the first main body member D1, and the set surface of the first main body member D1 and the surface of the bobbin case mounting base main body C0 are in close contact with each other. When the bobbin case D is continuously pressed downward, the inner holding portions of the slide pin base portions C28a and C29a are moved to the parallel portion D1f1 above the wide groove D1f, respectively. Since the distance between the wide grooves D1f is larger in the parallel portion D1f1 than in the lowermost portion, the flanges C28a and C29a that have moved to the parallel portion are located inside the wide grooves D1f due to the reaction force of the springs of the return springs C41 and C42. The bobbin case D is held with the edges C28a and C29a hitting the upper end of the wide groove D1f (FIG. 10 (3)).
[0065]
In this state, when the knobs C25a and C25a of the knob guide plates C25 and C25 are pinched with fingers and slid toward the hook A, the guide parts C25b and C25b slide smoothly along the edge of the opening Ba of the hook mounting base B. The bobbin case D is locked to the inner hook A2.
[0066]
Next, when the operation portion C30a of the upper and lower slide base C30 is pushed downward, the vertical portion C30c enters between the base portions of the slide pin bases C28 and C29 so that a gap is opened, and the inner edge of the wide groove D1f of the first body member D1 Is disengaged. Then, the bobbin case mounting base C is returned to the hook shaft side as it is, and the finger is released from the operation portion C30a at a position where the collar portions C28a and C29a pass through the wide groove D1f. When the finger is released from the knob guide plates C25, C25, the bobbin case mounting base C returns to its original position and stops by the restoring force of the slide shaft spring C2.
[0067]
Next, a procedure for taking out the bobbin case D attached to the inner hook A2 when the lower thread bobbin is replaced will be described.
[0068]
Grip the knobs C25a and C25a of the knob guide plates C25 and C25 with your fingers and slide the main body C0 of the bobbin case mounting base C in the direction of the hook A. When the tips of the slide pin bases C28a and C29a reach the bottom surface of the first main body member D1, the vertical slide base C30 is pressed to open the space between the bases C28a and C29. Then, the flange portions C28a and C29a are inserted into the parallel portion D1f1 of the wide groove D1f of the first main body member D1, and the finger is released from the vertical slide base C30. The vertical slide base C30 returns upward due to the restoring force of the return spring C44, and the flanges C28a and C29a hold the bobbin case D by strongly holding the inner edge of the wide groove D1f by the force of the return springs C41 and C42. To do. The bobbin case mounting base C is moved back as it is, and the bobbin case D is returned to the standby position on the hook shaft side.
[0069]
When the vertical slide base C30 is pushed to the position where it contacts the connecting part of the mounting base levers C37 and C38 at this position, the distance between the slide pin base parts C28a and C29a is increased and the engagement with the wide groove D1f is released, and the bobbin case D Is released. However, since the outer sides of the slide pin bases C28 and C29 are in contact with the outer edges of the wide grooves D1f, the bobbin case D does not fall off the surface of the main body C0. When the vertical slide base C30 is continuously pushed down to the lowest position, the connecting part of the mounting base levers C37 and C38, which is the apex of the four-bar link, is pushed down and the connecting part of the mounting base levers C34 and C35 is pulled upward. It is done. Accordingly, the push-up plate C27 together with the push-up plate pin C33 attached to the connecting portion of the mounting base levers C34 and C35 rises by the same amount as the push-down amount of the vertical slide stand C30, and the bobbin case D rises by the same amount. Thereafter, when the finger that has been pressing the upper and lower slide table C30 is released with force, the upper and lower slide table C30 is pulled upward by the restoring force of the return spring C44. At that time, the slide pin base parts C28a and C29a are in a position in contact with the point d slightly below the parallel part D1f1 of the wide groove D1f, causing slipping, and vigorously approaching each other due to the restoring force of the return springs C41 and C42. . The approaching force of the flanges C28a and C29a acting on the point d at that time becomes a component force that pushes up the bobbin case D, and the bobbin case D jumps upward and is released from the holding force of the slide pin bases C28 and C29. At that time, the flange portions C28a and C29a are at the lower ends of the wide grooves D1f and D1f. Due to the two-step rise, the bobbin case D rises above the amount by which the push-up plate C27 is raised, so that it can be easily removed from the bobbin case mounting base C. In addition, the return force of the return springs C39 and C40 acts due to the upward return of the vertical slide base C30, so that the mounting base levers C34, C35, C37 and C38 return to the original state, and the push-up plate C27 is also in the lower position. Return.
[0070]
【The invention's effect】
As described above, the hook body of the sewing machine according to the present invention can securely and easily attach and detach the bobbin case to the inner hook from the hook shaft side.
[0071]
In addition, when a slide plate and a pair of flanges are provided on the outer sides of both edges of the opening with claw release plates having ridges at positions close to the inner hook, the bobbin case is attached to the inner hook. When the bobbin case mounting base is moved closer to the hook, the bobbin case is opened by moving the flanges just before the hook, so that it is free to absorb the deviation of the axial position caused by the dimensional error of each part. Degrees are given, and subsequent insertion can be easily performed with light force.
[0072]
A member that guides the retained member of the bobbin case when the bobbin case is inserted into the opening, a member that acts to bring the lower part of the bobbin case closer to the bobbin case mounting body, and the opening When the bobbin case is not wide enough to be tilted during insertion, the bobbin case can be securely mounted and held on the bobbin case mounting base body.
[0073]
In a case having a push-up plate, a slide pin base, an upper and lower slide base, etc., the amount of ascending of the bobbin case is amplified by the operation of the upper and lower slide bases, so that it can be removed very easily.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a schematic configuration of a hook body of a sewing machine according to the present invention, (1) is a perspective view of an example of application to a two-needle sewing machine, (2) is a partially broken front view of a single body, 3) is a perspective view of the inner hook, (4) is a front view of the inner hook, and (5) is an enlarged sectional view of the ball portion of the inner hook. The following figures relate to the hook of the sewing machine of the present invention unless otherwise specified.
FIG. 2 is an explanatory view of each part constituting the bobbin case mounting base body, (1) is a perspective view of the body, (2) is a side view of the hook side of the body with the lid removed, and (3) is a lid. FIG. 6 is a side view of the side surface of the hook shaft of the main body with the body removed, and (4) is a front view of the main body holding the bobbin case.
FIG. 3 is a view of a bobbin case, (1) is a perspective view facing the yarn hooking portion side, (2) is a perspective view in a laid state, (3) is a perspective view facing the set surface side, 4) is a longitudinal sectional view.
FIGS. 4A and 4B are diagrams for explaining bobbin thread processing in a bobbin case. FIG. 4A is a perspective view of the bobbin case. FIG. 4B is a perspective view of the bobbin case's lower thread holding plate and thread tension spring. FIG. 3 is a side view of the inner hook, and (4) is a perspective view showing the relationship between the lower thread holding plate and the cam portion of the inner hook when the bobbin case is mounted on the inner hook.
FIG. 5 is a diagram illustrating a procedure for setting a bobbin case on a bobbin case mounting base and attaching the bobbin case to an inner hook.
FIGS. 6A and 6B are diagrams for explaining an operation of attaching the bobbin case to the bobbin case mounting base body, wherein FIG. 6A is a perspective view showing an attaching direction, and FIGS. .
FIG. 7 is a diagram for explaining the operation of each member when the bobbin case is attached to the bobbin case mounting base body, (1) to (4) showing the attachment process, and (5) the claw collar. FIG. 6 is a cross-sectional view of the bobbin case as viewed from above in a state where a held member is sandwiched.
FIGS. 8A and 8B are cross-sectional views for explaining posture stabilization at the time of setting a bobbin case. FIG. 8A is a view of the present invention provided with a bobbin case guide, and FIG. (3) and (4) are conventional ones, and (5) is an example of tilt prevention using a magnet.
FIG. 9 is a view of another bobbin case mounting base body, (1) is a perspective view, (2) is a perspective view with the lid removed, and (3) is a side view of the hook side with the lid removed. (4) is a side view of the shuttle shaft side, (5) is a plan view, and (6) is a longitudinal sectional view.
FIGS. 10A and 10B are diagrams relating to a bobbin case corresponding to another bobbin case mounting base body, wherein FIG. 10A is a side view of the first body of the bobbin case, FIG. 10B is a longitudinal sectional view of the first body; ) Is a longitudinal sectional view of the bobbin case mounting base body and the retained bobbin case.
[Explanation of symbols]
A pot
A2 pot
B hook mounting base Ba opening
B2 Bobbin case guide B3 Push leaf spring
B5 Nail release plate (opening member)
C bobbin case mounting base
C0 bobbin case mounting body
C1 guide shaft (guide member)
C7 slide plate
C8 nails
C9 Lock plate
C10 Lock release plate
C27 Push-up plate
C28 Slide pin base
C29 Slide pin base
C30 Vertical slide base
C34 Mounting lever
C35 Mounting lever
C37 Mounting base lever
C38 Mounting lever
D bobbin case
D1e holding member
D1f wide groove
E Lower thread bobbin
F intermediate hook presser
S hook shaft
K pot body

Claims (2)

A hook mounting base fixed to the end of the hook shaft on the sewing needle side and having an opening;
A hook provided at the end of the hook mounting base on the sewing needle side,
A guide member slidably provided on the hook shaft;
A bobbin case mounting base body which is guided by a guide member and moves forward and backward with respect to the inner hook;
The body has a slide plate that protrudes toward the hook and moves up and down,
Provided with a pair of flanges contacting and separating in a direction perpendicular to the sliding direction of the slide plate, the bobbin case is provided with a held member to be held when the pair of flanges approach,
The bobbin case is mounted on the bobbin case mounting base body by inserting the held member from above between a pair of flanges and the pair of flanges sandwiching the held member, and removing the slide plate ascending. The bobbin case is raised by the sewing machine and the pair of collars are separated from each other. A hook mounting base fixed to the end of the hook shaft on the sewing needle side and having an opening;
A hook provided at the end of the hook mounting base on the sewing needle side,
A guide member slidably provided on the hook shaft;
A bobbin case mounting base body which is guided by a guide member and moves forward and backward with respect to the inner hook;
The body has a push-up plate that protrudes toward the hook and moves up and down,
A pair of slide pin bases that have flanges that are in contact with and away from each other in a direction perpendicular to the direction of movement of the push-up plate and are biased toward each other;
In addition to providing a vertical slide base that can slide in the vertical direction,
The bobbin case is provided with two wide grooves which are parallel parts whose lower ends are close to each other and whose upper part gradually opens outward from each other and whose upper part is parallel.
The bobbin case is attached to the bobbin case mounting base body by moving the bobbin case so that the pair of slide pin bases in the approaching state enter the lower end of the wide portion, and the pair of slides by the lowering of the bobbin case. It is done by gradually opening the pin base along the wide groove and pinching it at the top of the wide groove.
To remove, open the pair of slide pin bases by lowering the upper and lower slide bases, raise the push-up plate to raise the bobbin case, and then move the pair of slide pin bases closer by returning the upper and lower slide bases upward. A sewing machine hook that is formed by pressing a portion below the parallel portion of the wide groove to raise the bobbin case.

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