CN203080256U

CN203080256U - Forward and reverse stitch switching device and its seam distance adjustment mechanism for sewing machine

Info

Publication number: CN203080256U
Application number: CN 201320035007
Authority: CN
Inventors: 林培嘉
Original assignee: Kaulin Manufacturing Co Ltd
Current assignee: Kaulin Manufacturing Co Ltd
Priority date: 2013-01-23
Filing date: 2013-01-23
Publication date: 2013-07-24
Anticipated expiration: 2023-01-23

Abstract

The utility model relates to a positive and negative seam switching device for a sewing machine and a seam distance adjusting mechanism thereof, which comprises a fixed seat, a shaft lever, a seam distance cam and a knob, wherein the fixed seat is provided with a shaft hole; the shaft lever is connected with the shaft hole in a penetrating way; the stitch cam is sleeved on the shaft lever and rotates along with the shaft lever, the stitch cam is provided with a cylinder and a guide rail, the guide rail defines a central section perpendicular to the axial lead of the cylinder, two sides of the guide rail are provided with abutting surfaces which take the central section as a reference and are mutually symmetrical, and the inner included angle between the abutting surfaces and the central section is an acute angle; the knob is connected to the shaft and formed outside the fixing seat. Thus, the adjustment and the change of the seam distance can be more easily and stably.

Description

Use in sewing machine just backstitch switching device shifter and the seam apart from guiding mechanism

Technical field

The relevant a kind of switching device shifter that just backstitching of the utility model, what refer to a kind of use in sewing machine especially just backstitches switching device shifter and seam thereof apart from guiding mechanism.

Background technology

What existing sewing machine was used is, just backstitching switching device shifter, such as No. the 258224th, the novel patent announcement of TaiWan, China announcement, it comprises that mainly a seam is apart from guiding mechanism, one back stitches control pillow block, one crank, one is subjected to a moving part and a switching mechanism, seam has a seam apart from screw rod apart from guiding mechanism, had by moving part to be to set up and down a pair of bearing surface of relation, this is to set apart from the end of screw rod is corresponding with seam to bearing surface, below bearing surface, protruded out an adjutage in addition, the two ends of crank are connected to and are subjected to moving part and back stitches control pillow block, switching mechanism has a trigger piece, one bull stick and a moving part, trigger piece and moving part are connected the two ends of bull stick, moving part is stirred switching corresponding to the adjutage that is subjected to moving part, thereby seam is optionally reclined apart from screw rod and bearing surface.

Yet; existing sewing machine is used just backstitches switching device shifter; though the conversion that can just backstitch; but what it was subjected to the bearing surface of moving part and adjutage is subjected to force direction all at grade; not only make seam seem heavy apart from the adjustment feeding of screw rod; and adjusted seam distance is because be subjected to the problem of force direction, and regular meeting seam takes place produces disappearances such as serious shake apart from instability and switching mechanism.Be subjected to each bearing surface of moving part to be subjected to the restriction in space, the weak point that its arc length is suitable, therefore the segmentation for needle gage is subjected to arresting limit and makes the precision of seam distance bad.

The utility model content

A purpose of the present utility model, what be to provide a kind of use in sewing machine just backstitches switching device shifter and seam thereof apart from guiding mechanism, and it utilizes the change that be subjected to force direction of seam apart from cam, and the adjustment conversion that can make the seam distance is more easily and stable.

In order to achieve the above object, what the utility model provided a kind of use in sewing machine just backstitches switching device shifter, and described Sewing machines has a body, and this is just backstitching switching device shifter and is comprising:

One seam is installed on the described body apart from guiding mechanism, comprising:

One axostylus axostyle, the described body of cross-under;

One seam is apart from cam, be socketed in this axostylus axostyle and follow rotation, the guide rail that this seam has a cylinder and extends outward from the radial perimeter of this cylinder apart from cam, the axial line of this cylinder is vertical mutually with the centre section of this guide rail, having with this centre section in the both sides of this guide rail is benchmark and symmetrical each other a pair of bearing surface, and the interior angle of this bearing surface and this centre section is an acute angle; And

One knob is connected this axostylus axostyle and is formed on described engine body exterior;

One switching mechanism, be placed on the described body stitching apart from a side of cam, this switching mechanism comprises a body of rod that is connected described body and a switch that is socketed in this body of rod, and this switch has respectively a pair of butt bar of corresponding respectively this bearing surface setting and a drawn stem that oppositely sets with this butt bar respectively; And

One switching mechanism comprises cross-under at a bull stick of described body, a trigger piece that is connected to this bull stick and a shifting part, and this shifting part is to setting actuating by drawn stem.

Further, wherein this seam also comprises a holder apart from guiding mechanism, and this holder is fixed on the described body, and this axostylus axostyle passes through this holder cross-under on described body.

Further, wherein this holder has a disk and a support, this support comprises the header board that is connected this disk behind side, is formed on a back plate at this header board rear and connects this header board and a transverse arm of this back plate, and this seam is formed between this header board and this back plate apart from cam.

Further, wherein this seam also comprises certain hyte part apart from guiding mechanism, this disk offers a blind hole, this knob is provided with most embeddings hole of annular arrangement, this positioning component comprises a helical spring and an alignment pin, this helical spring is contained in this blind hole, and this alignment pin wears this blind hole and pushed by this helical spring elasticity, and this alignment pin is done the build-in location away from this helical spring end corresponding to this embedding hole respectively.

Further, wherein this seam also comprises a limit assembly apart from guiding mechanism, and this limit assembly comprises a collar and a steady pin, and this collar socket is fixed on this axostylus axostyle, periphery at this collar is extended with a blocking arm, and this steady pin is fixed on this back plate turning circle that should blocking arm.

Further, wherein this switch also comprises a pedestal, respectively this butt bar is plugged on this pedestal and parallel each other at interval, this drawn stem is parallel to respectively, and this butt bar is plugged on this pedestal, this shifting part is extended with an arm that sets corresponding to this drawn stem, and this shifting part is stirred this drawn stem with this arm.

The utility model also provides a kind of seam that is just backstitching switching device shifter apart from guiding mechanism, comprising:

One holder offers an axis hole;

One axostylus axostyle, this axis hole of cross-under;

One knob is connected this axostylus axostyle and is formed on this holder outside.

Further, wherein this holder has a disk and a support, this support comprises the header board that is connected this disk behind side, is formed on a back plate at this header board rear and connects this header board and a transverse arm of this back plate, this axis hole connects this disk, this header board and this back plate, and this seam is formed between this header board and this back plate apart from cam.

Further, it also comprises certain hyte part, this disk offers a blind hole, this knob is provided with most embeddings hole of annular arrangement, this positioning component comprises a helical spring and an alignment pin, this helical spring is contained in this blind hole, and this alignment pin wears this blind hole and pushed by this helical spring elasticity, and this alignment pin is done the build-in location away from this helical spring end corresponding to this embedding hole respectively.

Further, it also comprises a limit assembly, and this limit assembly comprises a collar and a steady pin, and this collar socket is fixed on this axostylus axostyle, is extended with a blocking arm at the periphery of this collar, and this steady pin is fixed on this back plate turning circle that should blocking arm.

The utility model also has following effect establish and make bearing surface because track has enough arc length, but thereby opposite joint apart from carrying out cutting apart of refinement, so that the precision of seam distance is higher.In addition, utilize the setting of positioning component, make the seam can be by firm maintaining apart from the orientation of living in of cam.By the setting of limit assembly, can avoid because of the collision problem between the excessive transmission component that causes of seam distance again.

Description of drawings

Fig. 1 is the three-dimensional exploded view of the utility model seam apart from guiding mechanism.

Fig. 2 stitches apart from another visual angle three-dimensional exploded view of guiding mechanism for the utility model.

Fig. 3 is that guide rail of the present utility model launches schematic diagram.

Fig. 4 is just backstitching the combination schematic diagram of switching device shifter and body for the utility model.

Fig. 5 is just backstitching the combination schematic diagram of switching device shifter for the utility model.

Fig. 6 is just backstitching the three-dimensional exploded view of switching device shifter for the utility model.

Fig. 7 is just backstitching switching device shifter in conjunction with the user mode figure one that send the tool transmission device for the utility model.

Fig. 8 is the vertical view of Fig. 7.

Fig. 9 is just backstitching switching device shifter in conjunction with the user mode figure two that send the tool transmission device for the utility model.

Figure 10 is the vertical view of Fig. 9.

Among the figure, 1 ... seam is apart from guiding mechanism

10 ... holder

11 ... disk

12 ... support

121 ... header board

122 ... back plate

123 ... transverse arm

13 ... axis hole

14 ... perforation

15 ... blind hole

20 ... axostylus axostyle

30 ... seam is apart from cam

31 ... cylinder

311 ... axial line

32 ... guide rail

321 ... centre section

322,323 ... bearing surface

324 ... interior angle

40 ... knob

41 ... the embedding hole

50 ... positioning component

51 ... helical spring

52 ... alignment pin

55 ... limit assembly

551 ... the collar

552 ... steady pin

553 ... blocking arm

6 ... switching mechanism

61 ... the body of rod

62 ... switch

621 ... pedestal

622,623 ... the butt bar

624 ... drawn stem

625 ... short pin

7 ... switching mechanism

71 ... bull stick

72 ... trigger piece

73 ... shifting part

731 ... arm

8 ... Sewing machines

81 ... body

82 ... first axle sleeve

83 ... second axle sleeve

85 ... send the tool transmission device.

The specific embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the utility model and being implemented, but illustrated embodiment is not as to qualification of the present utility model.

Detailed description of relevant the utility model and technology contents cooperate graphic being described as follows, however appended graphic only provide with reference to and explanation usefulness, be not to be used for to the utility model limitr in addition.

As shown in Figure 1 to Figure 3, what the utility model provided a kind of use in sewing machine just backstitches switching device shifter and seam thereof apart from guiding mechanism, and its centre joint comprises that apart from guiding mechanism 1 holder 10, an axostylus axostyle 20, a seam are apart from a cam 30 and a knob 40.

Holder 10 can be cast iron or plastic or other material is made, it has a disk 11 and a support 12, support 12 roughly is a U font, its transverse arm 123 that comprises a header board 121 that is connected disk 11 rear end faces, a back plate 122 that is formed on header board 121 rears and connection header board 121 and back plate 122 constitutes, and offers an axis hole 13 that connects disk 11, header board 121 and back plate 122 at the center of disk 11.In addition the rim at disk 11 is provided with a plurality of through holes 14 and a blind hole 15, and each is bored a hole 14 is to wear for fixation kits such as screws, so that holder 10 is fixed on (as shown in Figure 4) on the Sewing machines body 81.

The bull stick of axostylus axostyle 20 for forming with metal material institute car system, it is that cross-under is in aforesaid axis hole 13.

Seam apart from cam 30 be socketed in axostylus axostyle 20 and be formed on holder 10 header board 121 and the back plate 122 between, seam has a cylinder 31 and expands outwardly an extended guide rail 32 from the radial perimeter of cylinder 31 apart from cam 30, cylinder 31 is socketed in axostylus axostyle 20 and is to lock at axostylus axostyle 20 by screw, rotates so that seam is followed axostylus axostyle 20 apart from cam 30.Cylinder 31 definition have an axial line 311, guide rail 32 definition have a centre section 321, the axial line 311 mutual vertical (as shown in Figure 3) of this centre section 321 and cylinder 31, having with centre section 321 in the both sides of guide rail 32 is benchmark and symmetrical each other a pair of bearing surface 322,323, after the bearing surface 322,323 of present embodiment launches is an inclined plane, each bearing surface 322,323 and centre section 321 are folded with angle 324 in respectively, and angle 324 is an acute angle in this.

Knob 40 is connected the end face of axostylus axostyle 20 and is formed on holder 10 outsides, is provided with most embeddings hole 41 at knob 40 corresponding to the end face of aforementioned disk 11, and these embedding holes 41 be with etc. radius and equidistant mode annular arrangement.

Seam of the present utility model also comprises certain hyte part 50 apart from guiding mechanism 1, it comprises a helical spring 51 and an alignment pin 52, helical spring 51 is contained in the aforementioned

blind hole

15,52 cross-under blind holes 15 of alignment pin are also pushed by helical spring 51 elasticity, and alignment pin 52 is optionally done the build-in location corresponding to embedding hole 41 away from the end of helical spring 51.

Seam of the present utility model also comprises a limit assembly 55 apart from guiding mechanism 1, it comprises a collar 551 and a steady pin 552, the collar 551 extends a blocking arm 553, the turning circle of steady pin 552 corresponding blocking arms 553 is fixed on the outside of aforementioned back plate 122, the collar 551 is socketed in the end of aforementioned axostylus axostyle 20 and fixes by screw, rotate so that the collar 551 is followed axostylus axostyle 20, steady pin 552 is in order to limit the gyrobearing of 553 blocking arms.

To shown in Figure 6, what the utility model provided a kind of use in sewing machine just backstitches switching device shifter as Fig. 4, and it comprises a seam apart from guiding mechanism 1, a switching mechanism 6 and a switching mechanism 7, and described Sewing machines 8 has a body 81.

Seam except can be the foregoing description, also can omit aforesaid holder 10 apart from guiding mechanism 1, directly offers the axis hole (scheming not shown) for aforementioned axostylus axostyle 20 cross-under on body 81.Previous embodiment is to wear the perforation 14 of disk 11 and holder 10 is placed on the body 81 with screw.

Switching mechanism 6 corresponding seams are placed on the body 81 apart from a side of cam 30, and switching mechanism 6 comprises a body of rod 61 and a switch 62, and an end of the body of rod 61 is to wear to be fixed on the body 81, and the other end then wears by one first axle sleeve 82 and is fixed on the body 81.Switch 62 is sheathed to be articulated in the zone line of the body of rod 61 and to be formed on the side of seam apart from cam 30, and switch 62 comprises a pedestal 621, a pair of butt bar 622,623, a drawn stem 624 and a short pin 625.Each butt bar 622,623 is plugged on pedestal 621 and parallel each other at interval, each butt bar 622,623 stride be located at guide rail 32 with each bearing surface 322,323 corresponding setting.Drawn stem 624 is parallel to each butt bar 622,623 and is plugged on the pedestal 621, but extends in the opposite direction with each butt bar 622,623.Short pin 625 is parallel to drawn stem 624 and is plugged on the pedestal 621, and is equidirectional setting with drawn stem 624.

One side of switching mechanism 7 corresponding switching mechanisms 6 is installed on the body 81, switching mechanism 7 comprises a bull stick 71, one trigger piece 72 and a shifting part 73, bull stick 71 wears by one second axle sleeve 83 and is articulated in body 81, trigger piece 72 and shifting part 73 are fixed in the both ends of bull stick 71 respectively, trigger piece 72 is formed in the outside of body 81, shifting part 73 is extended with an arm 731 that sets corresponding to aforementioned drawn stem 624, bull stick 71 and shifting part 73 are to follow trigger piece 72 to do turn, shifting part 73 is stirred switching with 731 pairs of drawn stems 624 of its arm, thereby makes each butt bar 622,623 with each bearing surface 322,323 optionally recline.

Extremely shown in Figure 8 as Fig. 7, described Sewing machines 8 also comprises and send tool transmission device 85, be to be connected with sending tool transmission device 85 during use with aforesaid short pin 625, in the time will advancing sewing (forward sewing), earlier knob 40 is rotated to the seam of required sewing apart from scale, alignment pin 52 by positioning component 50 is done the build-in location corresponding to knob 40 embedding holes 41, get so that axostylus axostyle 20 and seam are maintained at preposition apart from cam 30, this moment is owing to send the connecting rod (not label) of tool transmission device 85 to be subjected to the tension of extension spring (not label), to order about connecting rod moves towards upper position, 625 of short pins are pivot with the body of rod 61, order about pedestal 621 and produce the clockwise direction rotation, and the butt bar 622 in order left side and the bearing surface 322 in left side recline mutually, in the time of so can advancing the sewing operation of sewing.

Extremely shown in Figure 10 as Fig. 9, otherwise, in the time will falling back sewing, trigger piece 72 is pushed towards the below, to drive bull stick 71 and shifting part 73 turn together, utilize the arm 731 of shifting part 73 to promote drawn stem 624, drawn stem 624 will be that pivot produces anticlockwise rotation with the body of rod 61, the butt bar 623 on military order right side reclines mutually with the bearing surface 323 on right side at this moment, and make and send the connecting rod of tool transmission device 85 to move, and then make and send the tool (scheming not shown) that send of tool transmission device 85 to produce reciprocal handover start towards the below.

The above embodiment is the preferred embodiment that proves absolutely that the utility model is lifted, and protection domain of the present utility model is not limited thereto.Being equal to that those skilled in the art are done on the utility model basis substitutes or conversion, all within protection domain of the present utility model.Protection domain of the present utility model is as the criterion with claims.

Claims

1. A forward and backward stitch switching device for a sewing machine, characterized in that the sewing machine has a body, and the forward and reverse stitch switching device comprises:

A seam adjustment mechanism, installed on the body, includes:

a shaft threaded through the body;

A gap cam is sleeved on the shaft and rotates accordingly. The gap cam has a cylindrical body and a guide rail extending outward from the radial periphery of the cylindrical body. The axis of the cylindrical body perpendicular to the central section of the guide rail, and on both sides of the guide rail there are a pair of abutting surfaces that are based on the central section and are symmetrical to each other, and the inner angle between the abutting surface and the central section is an acute angle; and

a knob connected to the shaft and formed outside the body;

A switching mechanism, one side corresponding to the seam distance cam is arranged on the body, the switching mechanism includes a rod connected to the body and a switch sleeved on the rod, the switch has corresponding to each of the a pair of abutting rods arranged on the abutting surface and a pushed rod arranged oppositely to each of the abutting rods; and

A toggle mechanism includes a rotary rod connected to the body, a trigger and a toggle piece connected to the rotary lever respectively, and the toggle piece is correspondingly configured to be actuated by the push rod.

2. The forward and reverse stitch switching device for sewing machines according to claim 1, wherein the stitch distance adjusting mechanism further comprises a fixed seat, the fixed seat is fixedly connected to the body, and the shaft passes through the The fixing seat is threaded on the body.

3. The forward and reverse sewing switching device for sewing machines as claimed in claim 2, wherein the fixed seat has a disc and a bracket, and the bracket includes a front plate connected to the back of the disc, forming A rear plate behind the front plate and a transverse arm connecting the front plate and the rear plate, the gap cam is formed between the front plate and the rear plate.

4. The forward and backward sewing switching device for sewing machines as claimed in claim 3, wherein the seam distance adjusting mechanism also includes a positioning assembly, the disk is provided with a blind hole, and the knob is provided with circularly arranged Most embedded holes, the positioning component includes a coil spring and a positioning pin, the coil spring is accommodated in the blind hole, the positioning pin passes through the blind hole and is elastically pushed by the coil spring, the positioning pin is far away from the coil The ends of the springs are embedded and fixed corresponding to the embedding holes.

5. The forward and reverse sewing switching device for sewing machines according to claim 3, wherein the seam distance adjustment mechanism further comprises a limit assembly, the limit assembly includes a set of rings and a fixed pin, the set of The ring is sleeved and fixed on the shaft rod, a blocking arm extends from the periphery of the collar, and the fixed pin is fixed on the rear plate corresponding to the swivel area of the blocking arm.

6. The forward and backward sewing switching device for sewing machines according to claim 1, wherein the switching device further comprises a base, each of the abutting rods is inserted into the base at intervals and parallel to each other, the The pushed rod is inserted on the base parallel to each of the abutment rods, and the toggle piece extends with an arm corresponding to the pushed rod, and the toggle piece is connected to the pushed rod by the arm. to toggle.

7. A seam distance adjustment mechanism of forward and backward stitch switching device, it is characterized in that, comprising:

A fixed seat, which is provided with a shaft hole;

a shaft threaded through the shaft hole;

A knob is connected to the shaft and formed outside the fixing base.

8. The seam distance adjusting mechanism of the forward and backward sewing switching device according to claim 7, wherein the fixing seat has a disc and a bracket, and the bracket includes a front plate connected to the back of the disc , a rear plate formed at the rear of the front plate and a transverse arm connecting the front plate and the rear plate, the shaft hole passes through the disc, the front plate and the rear plate, and the gap cam is formed on the front plate and the rear panel.

9. The seam distance adjusting mechanism of the forward and backward sewing switching device according to claim 8, characterized in that it also includes a positioning assembly, the disk is provided with a blind hole, and the knob is provided with a plurality of embedded holes arranged in a ring , the positioning assembly includes a coil spring and a positioning pin, the coil spring is accommodated in the blind hole, the positioning pin passes through the blind hole and is elastically pushed by the coil spring, the positioning pin is far away from the end of the coil spring Corresponding to each of the embedding holes for embedding and fixing.

10. The seam distance adjusting mechanism of the forward and backward stitch switching device according to claim 8, characterized in that it further comprises a stopper assembly, the stopper assembly includes a collar and a fixing pin, and the collar is sleeved Fixed on the shaft rod, a blocking arm extends from the periphery of the collar, and the fixed pin is fixed on the rear plate corresponding to the swivel area of the blocking arm.