JPS5916797B2 - Attachment drive coupling device for sewing machines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention fixes attachments on a sewing machine, such as a cloth edge cutting attachment, a buttonhole attachment, an initial sewing attachment, etc., in a fixed position on a sewing machine bed, and in the fixed state, the operation mechanism of the attachment is fixed. This invention relates to an attachment drive coupling device for coupling the sewing machine and the movement mechanism in the sewing machine bed.

When performing sewing work using this type of attachment on a conventional sewing machine, it is necessary to remove the throat plate installed on the sewing machine bed, open the slide plate located adjacent to the throat plate, Alternatively, a part of the sewing machine bed is opened by removing a lid provided on a part of the throat plate, and the attachment frame is fixed at a fixed position on the sewing machine bed so as to be located near the opening. The operating mechanism of the attachment and the movement mechanism within the sewing machine bed are manually connected via the opening, and sewing work is started.

Therefore, in this conventional configuration, when attaching the attachment to the sewing machine bed, the operating mechanism of the attachment and the movement mechanism in the sewing machine bed must be connected manually, and the preparation operation is very complicated. Both require time, and it is not possible to immediately start sewing work using the attachment.

This invention was made in order to solve the above-mentioned conventional defects, and its purpose is to simply fix the attachment in a fixed position on the sewing machine bed, and to prevent the attachment from moving when the sewing machine starts operating. A drive connection device for an attachment in a new sewing machine in which the operating mechanism and the drive mechanism in the sewing machine bed are automatically connected, and sewing work can be performed immediately without the need for any manual operation to connect the two mechanisms. It is about providing.

Hereinafter, the configuration of a sewing machine in which the present invention is embodied as a drive connection device for a cloth edge cutting attachment will be explained in detail with reference to one drawing. In the drawing, reference numeral 11 is a sewing machine arm, and a needle bar is attached to the head of the tip of the sewing machine arm. A sewing machine needle 12 and a presser foot 13 are attached to the lower end of the presser bar.

The presser foot 13 in this embodiment is urged to rotate clockwise in FIG. 1 by a spring 14, and its tip also presses the workpiece cloth to cut the workpiece cloth using a cloth edge cutting attachment, which will be described later. This ensures that the operation can be performed reliably.

Reference numeral 15 denotes a sewing machine bed, on the upper surface of which a top plate 16 is fixed, and on the left end of the front surface a can lid 17 is attached so as to be openable and closable.

Reference numeral 18 denotes a needle plate attached to the front of the upper surface of the soil plate 16, and on the left side of the throat plate there is a feed tooth 19 extending in the cloth feeding direction.
A needle hole 18b extending in a direction perpendicular to the cloth feeding direction is formed, and an opening 18c for attaching a cloth edge cutting attachment is formed in the front portion on the right side.

In this embodiment, when performing normal sewing work, the opening 18c of the throat plate 18 is closed with a removable or slidable lid (not shown), and the upper plate 18
By utilizing the entire work cloth support surface formed on the throat plate 18 and the upper surface of the lid, sewing operations can be performed smoothly.

Reference numeral 20 denotes a shuttle drive shaft in the movement mechanism of the sewing machine, which is rotatably supported within the sewing machine bed 15 so as to extend in a direction perpendicular to the cloth feeding direction.As shown in FIG. A bevel gear 21 is fixed.

Reference numeral 22 denotes a rotating shaft rotatably supported within the sewing machine bed 15 so as to extend in the cloth feeding direction, and a driven bevel gear 23 that meshes with the driving bevel gear 21 on the shuttle drive shaft 20 is provided at its rear end. A hook 24 is attached to the front end of the sewing machine for sewing work cloth in cooperation with the sewing machine needle 12.

Reference numeral 25 denotes a holding plate fixed to the bottom inner surface of the sewing machine bed 15 by a plurality of mounting screws 26 so as to be located below the opening 18c of the needle plate 18, and is shown in FIGS.
As shown in the figure, a pair of left and right support legs 27 and a mounting plate 28 between the upper ends thereof.

An engagement surface 27a is provided at the upper left end of the right support leg 2T.
At the same time, a mounting surface 28a is formed on the upper surface of the mounting plate portion 28, which extends parallel to the work cloth support surface on the sewing machine bed 15 slightly below the opening 18c.

Reference numeral 29 denotes an insertion hole extending in the front-rear direction that is formed on the right side of the mounting plate portion 28, and a movement permitting hole 30 is formed toward the left on the left side opening edge of the insertion hole 29 near the front end.

Reference numeral 31 denotes a fitting hole extending in the left-right direction formed on the left side of the mounting plate portion 28, and which has a wide width portion 31a and a narrow width portion 3.
1b, and a pair of regulating protrusions 32 in the shape of an inverted letter from the front are integrally formed at the lower right side of both the front and rear opening edges of the wide part 31a, spaced apart from each other by the same width as the narrow part 31b. It is formed with a bend.

Reference numeral 33 denotes an operating cam with a substantially triangular side surface fixed on the hook drive shaft 20 behind the holding plate 25, and 34 is rotatable into the sewing machine bed 15 by a support shaft 35 extending parallel to the hook drive shaft 20. As shown in FIGS. 2 and 5, the three-pronged arm is engaged with the operating cam 33 and is swung by the operating cam 33 as the hook drive shaft 20 rotates. ing.

As is clear from FIGS. 3 and 5, 36 is connected to the operating protrusion 34a of the fork arm 34 by a support pin 37 at the lower end.
The operating link is rotatably and axially movably attached to the distal end of the forked arm 34 and extends upwardly through between the pair of regulating protrusions 32 of the retaining plate 25. As it swings, its swinging motion is restricted by the regulating protrusion 32 so that it can reciprocate only in the vertical direction, and a connecting hole 36a is formed at its upper end.

38 is a compressed spring wound around the support pin 37 between the head of the support pin 37 and the operating link 36, and urges the operating link 36 to move toward the right in FIG. ing.

Next, the lid closing the opening 18c of the needle plate 18 is removed or moved to open, and the lid is removably placed and fixed on the throat plate 18 of the sewing machine bed 15 so as to be located near the opening 18c. The structure of the fabric edge cutting attachment will be explained below.

Reference numeral 40 denotes an attachment frame, and as shown in FIGS. 2 and 3, an accommodating portion 40a that opens downward is formed inside the attachment frame, and a vertical rotation regulating portion 40b is provided at the right front end of the upper surface. Four mounting portions 40c are formed.

Reference numeral 41 indicates the entire locking member for fixing the attachment frame 40 on the throat plate 18 in cooperation with the holding plate 25, and reference numeral 42 indicates a locking member that can be rotated around the vertical axis of one hand and moved in the axial direction. The operating shaft of the locking member 41 is supported through the attachment frame 40 at the mounting portion 40c, and 43 is an operating knob fixed to the upper end of the operating shaft 42, as shown by the chain line in FIG. When the rotation operation is performed counterclockwise, the rotation restriction portion 40b of the mounting recess 40c
It is designed to engage with

A compression spring 44 is interposed between the operating knob 43 and the upper surface of the mounting recess 40c, and urges the operating shaft 42 to move upward.

Reference numeral 45 denotes a locking member 4- provided at the lower end of the operating shaft 42.
1, which is normally held in contact with the lower surface of the attachment frame 40 by the action of the compression spring 44, so that the lower front end of the attachment frame 40 passes through the opening 18c of the needle plate 18 and is attached to the retaining plate 25. When placed on the mounting surface 28a of the plate part 28, the insertion hole 2 of the mounting plate part 28 is inserted as shown by the chain line in FIGS. 6 and 8.
It is designed to be inserted into 9.

When the operating knob 43 is pressed against the compression spring 44, the cam portion 45 of the locking portion body 41 allows the mounting plate portion 28 to be inserted from inside the insertion hole 29 as shown by the solid line in FIG. It protrudes downward, and then the operation shaft 42 is moved by the operation knob 43.
When rotated clockwise from the chain line position in FIG. 6, the attachment frame 40 is engaged with the engagement surface 27a of the support leg 27 of the holding plate 25 to the left, as shown by the solid line in the figure. and engages with the lower surfaces of the opening edges of the insertion hole 29 and the movement allowance hole 30 at the moved position,
The attachment frame 40 is locked and fixed so as not to be able to move to the right and upward.

Reference numeral 46 denotes a contact part body whose side surface is approximately inverted U-shaped and which is fixed to the lower surface of the attachment frame 40 near the front end of the central part by a mounting screw 47, and the attachment frame 40 is attached to the mounting plate part of the holding plate 25. When placed on the mounting surface 28a of the mounting plate 28, as shown in FIG. The attachment frame 40 is held immovably in the front and back direction by engagement with the front and rear opening edges of the hole 31, and when the attachment frame 40 is moved to the left by the action of the locking part body 41.

3 and 6 (as shown, the contact portion 46a at the left end of the horizontal plate portion contacts the left opening edge of the fitting hole 31, and the left opening edge at the retaining portion 46b at the left end of both vertical plate portions). engages the bottom surface of the

The attachment frame 40 is locked and fixed so that it cannot move leftward and upward.

Reference numeral 48 denotes a protruding arm integrally formed to protrude leftward from the left front end of the attachment frame 40, and as shown in FIGS. 1 and 3, when the attachment frame 40 is in the fixed state, the protruding arm 48 It is fitted into the opening 18c, and its upper end surface is disposed on substantially the same plane as the work cloth support surface, that is, the upper surface of the throat plate 18.

Reference numeral 49 denotes a bearing cylinder integrally formed to protrude leftward from the left rear end of the attachment frame 40, and as is clear from FIGS. 3 and 4, when the attachment frame 40 is in a fixed state, the work cloth It is arranged at a distance above the support surface.

Reference numeral 50 denotes a fixed blade having a roughly L-shaped front face fixed to the tip of the protruding arm 48 by a mounting screw 51, and as shown in FIG. The blade portion is arranged close to the needle hole 18b of the needle plate 18 on the cloth feeding side on substantially the same plane as the work cloth support surface.

Reference numeral 52 designates the housing portion 40a of the attachment frame 40 and the bearing sleeve 4 so as to extend in a direction perpendicular to the cloth feeding direction.
9. A drive shaft is supported through the entire length of the drive shaft so as to be able to reciprocate and rotate.

Reference numeral 53 denotes a drive arm attached to the left end of the drive shaft 52, and as shown in FIGS. 3 and 4, when the attachment frame 40 is in the fixed state, it is arranged above the work cloth support surface. It has become so.

Reference numeral 54 denotes a movable blade fixed to the left side surface of the front end of the drive arm 53. A blade portion and a guide protrusion 54a are formed at the lower end of the movable blade.
The edge of the workpiece cloth transferred in the cloth feeding direction is cut in cooperation with the sewing machine 10 prior to oversewing.

55 is the housing portion 40a of the attachment frame 40.
so as to swing integrally with the movable blade 54 within the movable blade 54;
A swinging arm 56 is fixed to the right end of the drive shaft 52 via a mounting boss 55a, and 56 is connected to the swinging arm 55 and the housing portion 4.
A compression spring interposed between the inner surface of the movable blade 54 and the inner surface of the blade 0a urges the swinging arm 55 and the drive shaft 52 to move to the left, thereby constantly pressing the movable blade 54 toward the fixed blade 50. It looks like this.

57 is attached to the swing arm 5 at the upper end by a mounting pin 58.
The linking arm is rotatably attached to the tip of the eighth
As shown in the figure, when the attachment frame 40 is placed on the holding plate 25 in the sewing machine bed 15, the lower end extending downward from the attachment frame 40 is attached to the throat plate 1.
8 and the narrow portion 31b of the fitting hole 31 on the holding plate 25 to protrude downward from the mounting plate portion 28.

Further, as shown in FIGS. 3 and 5, a vertical slot 57a is formed approximately in the center of the linking arm 57, and the attachment frame 40 is connected to the locking member 41 on the left side of the lower end.
When the holding plate 25, the locking part body 41 and the contact part body 46 cooperate with each other to fix the movement to the left, the operation inside the sewing machine bed 15 occurs. A connecting pin 57b is disposed near the upper end of the link 36 and has a conical head that can fit into the connecting hole 36a of the operating link 36.

Reference numeral 59 denotes a guide plate fixed in the accommodation portion 40a of the attachment frame 40 so as to correspond to the linking arm 57, and as shown in FIGS. Guide pin 5 that fits into slot 57a
9a is provided in a protruding manner to substantially restrict the swinging movement of the linking arm 57, allowing only vertical movement.

Therefore, when the attachment frame 40 is fixed on the sewing machine bed 15 as described above, the linking pin 57b of the linking arm 57 on the attachment frame 40 side may not match the linking hole 36a of the operating link 36 on the sewing machine bed 15 side. Even if the link arm 57 and the operating link 36 are pressed toward each other by the action of the compression springs 56 and 38 as described above, the rotation of the hook drive shaft 20 during subsequent operation of the sewing machine causes , operating cam 33
While the operating link 36 is reciprocated up and down once through the forked arm 34, the linking pin 57b of the linking arm 57 fits into the linking hole 36a, thereby connecting the drive shaft 52 of the movable blade 54 and the sewing machine. The hook drive shaft 20 in the driving mechanism is automatically operatively connected.

Next, when the edge of the work cloth is cut in cooperation with the fixed blade 50 as the movable blade 54 reciprocates while the attachment frame 40 is fixed, the fixed blade 50 and the movable blade 54 A configuration for removing cloth waste from the cutting operation section will be described.

60 is the sewing machine bed 15 when the attachment frame 40 is fixed as shown in FIGS. 3 and 4.
A support member is formed between the upper surface of the protruding arm 48, which is disposed substantially on the same plane as the upper work cloth support surface, and the bearing cylinder 49 and the drive arm 53, which are arranged apart from each other above the work cloth support surface. A space 61 for removing cloth waste is a recess formed on the upper surface of the protruding arm 48 and extending in the left-right direction for guiding cloth waste,
As shown in FIGS. 3 and 7, the left side thereof communicates with the cutting operation section.

62 is located close to the fixed blade 50 and near the rear left end of the upper surface of the protruding arm 48 so as to be located on the cloth feeding side of the fixed blade 50 and above the work cloth support surface when the attachment frame 40 is fixed. This is a protruding cloth handling section, and the cloth scraps cut in the cutting operation section are guided from the cutting operation section to the rear right side by the cooperation of this cloth handling section 62 and the recess 61, and are guided through the space 60. It is designed to be smoothly removed backwards.

The operation of the sewing machine and cloth edge cutting attachment constructed as described above will be explained next.

Now, when performing overlock stitching while cutting the edge of the workpiece cloth using this fabric edge cutting attachment, the lid body (not shown) that closes the opening 18c of the throat plate 18 on the sewing machine bed 15 (not installed) or move it open,
As shown in FIG. 8, the lower front end of the attachment frame 40 is inserted into the sewing machine bed 15 through the opening 18c and placed on the mounting surface 28a of the mounting plate portion 28 of the holding plate 25.

Thereby, the cam part 45, the contact part body 46, and the linking arm 57 of the locking part body 41 on the attachment frame 40 side are connected to the insertion hole 29 on the holding plate 25 side, the wide part 31a and the narrow part 31b of the fitting hole 31. The engagement between the front and rear vertical plate portions of the abutment body 46 and the front and rear opening edges of the fitting hole 31 restricts the movement of the attachment frame 40 in the front and rear direction.

Thereafter, while pressing the operating knob 43 of the locking member 41 against the action of the compression spring 44, the operating shaft 42 is moved to the sixth position.
When rotated clockwise from the chain line position in the figure, the cam part 45 of the locking part body 41 engages with the engagement surface 27a of the support leg part 27 of the holding plate 25, as shown by the solid line in the figure, and the attachment The frame 40 is moved to the left, and in the moved position, the cam part 45 engages with the lower surface of the opening edge of the insertion hole 29 and the movement allowance hole 30 of the holding plate 25, and the attachment frame 40 is moved rightward and upward. It is locked and fixed in place.

Further, as the attachment frame 40 moves leftward, the contact body 46 moves as shown in FIGS. 3 and 6.
The contact portion 46a of the attachment frame 40 contacts the left opening edge of the fitting hole 31 on the holding plate 25, and the engagement portion 46b of the contact portion body 46 engages with the lower surface of the left opening edge. is locked and fixed to the left and upward so that it cannot move.

When the attachment frame 40 is in the fixed state, the upper end surface of the protruding arm 48 extending to the left side is disposed on substantially the same plane as the workpiece cloth support surface, and the blade portion of the fixed blade 50 at the left end supports the workpiece cloth. It is arranged close to the needle hole 18b of the throat plate 18 on the cloth feeding side on substantially the same plane as the needle hole 18b of the throat plate 18, and the bearing cylinder 49 and the driving arm 53 at its left end are arranged apart above the workpiece cloth support surface.

On the other hand, due to the leftward movement of the attachment frame 40, the lower end of the link arm 57 is moved to the left and placed close to the upper end of the operating link 36 in the sewing machine bed 15, and in this state, the compression spring 56.38 Due to the action of the linking arm 5
7 and the actuating link 36 are pushed toward each other.

Therefore, when the sewing machine starts operating in this state, as the hook drive shaft 20 in the movement mechanism of the sewing machine rotates, the operating link 36 is reciprocated in the vertical direction via the operating cam 33 and the forked arm 34. 36 is reciprocated once, the link pin 57b of the link arm 57 fits into the link hole 36a of the operating link 36, and the drive shaft 52 of the movable blade 54 and the hook drive shaft 20 are operatively connected.

If the sewing machine continues to operate in this state, as the hook drive shaft 20 rotates, the operating cam 33, forked arm 34, operating link 36, link arm 57, swing arm 55, and drive shaft 52 rotate.
The movable blade 54 is reciprocated through the movable blade 54, and the movable blade 54 cooperates with the fixed blade 50 to cut the edge of the workpiece cloth being transferred in the cloth feeding direction, and also cuts the edge of the workpiece cloth transferred in the cloth feeding direction. Overlock stitching is performed by the cooperation of the sewing machine needle 12 and hook 24.

Further, cloth waste generated in the cutting operation section during this sewing work is removed from the recess 61 on the upper surface of the protruding arm 48 and the cloth handling section 6.
By the cooperative action of 2, it is guided from the cutting operation part to the rear right side,
A space 60 formed below the bearing cylinder 49 and the drive arm 53
through which it is smoothly expelled backwards.

Therefore, no cloth waste remains in the cutting operation section consisting of the fixed blade 50, the movable blade 54, and the cutting operation section, making it possible to easily and accurately cut the edges of the cloth and overseam.

Next, a case will be described in which normal sewing work is performed without using the cloth edge cutting attachment.

In this case, in almost the reverse order to the above-described installation of the attachment, first rotate the operating knob 43 of the locking body 41 located at the solid line position in FIG. 3 counterclockwise to the chain line position, and then When moved to the right, as shown in FIG. are released from engagement with the aperture edges of the apertures and are aligned with those apertures.

The linking pin 57b of the linking arm 57 is removed from the linking hole 36a of the operating link 36.

Therefore, in this state, if the attachment frame 40 is lifted upward, the attachment is removed from the sewing machine bed 15, and the opening 18c of the needle plate 18 is closed with the lid, the entire workpiece support surface can be effectively utilized and the normal Sewing work can be performed smoothly.

Note that the present invention is not limited to the configuration of the above-described embodiment, and for example, the attachment frame 40 may be configured to be fixed on the sewing machine bed 15 with a plurality of mounting screws, or the compression spring may be configured to be fixed to the sewing machine bed 15 using a plurality of mounting screws. 57 or the operating link 36, or the configurations of the attachment frame 40, the linking arm 57, the guide means, the operating link 36, the regulating means, the spring means, the connecting means, etc. may be arbitrarily changed without departing from the spirit of the present invention. In addition to the fabric edge cutting attachment in the above embodiments, the present invention can also be modified to include a buttonhole attachment, an initial sewing attachment, and the like.

As described in detail above, the present invention allows the operation mechanism of the attachment to be adjusted by simply opening a part of the sewing machine bed and fixing it in a fixed position on the sewing machine bed so that it is located near the opening. A connected link arm capable of only vertical movement is disposed close to an operating link connected to a movement mechanism of the sewing machine and capable of only vertical movement through the opening,
When the sewing machine starts operating thereafter, the connecting arm and the operating link are automatically connected by the action of the spring means, so that the attachment operating mechanism and the sewing machine movement mechanism are not connected to each other as in the conventional structure. Sewing work can be started immediately by simply fixing the attachment on the sewing machine bed without requiring the complicated operation of manually connecting the two.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the main parts of a sewing machine showing the installed state of the cloth edge cutting attachment embodying the present invention, Fig. 2 is a plan view of the main parts similarly partially cut away, and Fig. 3 is the same as Fig. 2. 3-
3, FIG. 4 is a partial sectional view taken along line 4-4 in FIG. 3, FIG. 5 is a sectional view taken along line 5-5 in FIG. 3, and FIG. 6 is a sectional view taken along line 6-6 in FIG. 3. 7 is a partial perspective view of the attachment frame, and FIG. 8 is a sectional view of a main part showing a state in which the attachment has been moved from the state shown in FIG. 3. Sewing machine bed 15, throat plate 18, opening 18c, hook drive shaft 2
0, retaining plate 25, fitting hole 31, regulating protrusion 32, operating link 36, connecting hole 36a, compression spring 38, attachment frame 40, fixed blade 50, drive shaft 52, movable blade 54
, compression spring 56° linking arm 57, vertical slot 5γa, linking pin 57h guide plate 59, guide pin 59a0

Claims (1)

[Scope of Claims] 1. A part of the sewing machine bed is opened, and an attachment is removably fixed on the sewing machine bed so as to be located near the opening, and in the fixed state, the operating mechanism of the attachment and the sewing machine bed are In the sewing machine configured such that the movement mechanism in the attachment frame is connected through the opening, the attachment is provided with a linking arm that is connected to the operating mechanism for driving the operating mechanism and projects downward from the attachment frame; , a guide means is provided between the link arm and the attachment frame to restrict the swinging movement of the link arm and only allow its vertical movement, and is connected to the movement mechanism of the sewing machine within the sewing machine bed; An operating link is provided whose upper end is located near the lower end of the linking arm when the attachment is fixed on the sewing machine bed, and a space between the operating link and the sewing machine bed restricts the swinging movement of the operating link. and a regulating means for permitting only vertical movement thereof, and at least one of the linking arm and the operating link is provided with a spring means for biasing it toward the other; A connecting means is provided between the two for releasably connecting the two, and when the attachment is fixed on the sewing machine bed and the sewing machine starts operating thereafter, the connecting arm and the operating link are connected by the action of the spring means. A driving connection device for an attachment, characterized in that the attachment is configured to be connected in a force-transitive manner. 2. The driving connection device for an attachment in a sewing machine according to claim 1, wherein the guide means comprises a vertical slot formed in the link arm and a guide pin fixed to the attachment frame and fitted into the vertical slot. 3. The regulation I11 means is formed on a holding plate fixed in the sewing machine bed, and comprises a pair of regulation protrusions that can be engaged with both side edges of the operating link. A driving connection device for an attachment in the sewing machine described in . 4. The attachment for a sewing machine according to any one of claims 1 to 3, wherein the connecting means comprises a connecting hole formed in the operating link and a connecting pin fixed to a lower end of the connecting arm. drive coupling device.