TWI650461B - Inner presser foot mechanism - Google Patents

Abstract

The inner presser foot mechanism of the invention has an inner presser foot and a rocking component, and a link assembly is arranged between the inner presser foot and the rocking component, and the link component is connected to the drive source capable of rotating via the moving component, wherein the rocking component is A cam assembly is disposed between the moving components, and the cam assembly has an active cam connected to the driving source and a driven roller connected to the rocking assembly, and the active cam can move from the preliminary contact position to the contact position through the moving component, so that the active component The cam contacts the driven roller, so that the rocking assembly and the connecting rod assembly together drive the inner pressing foot to move from the pressing position to the preliminary pressing position, so that the inner pressing foot can be separated from the sewing material, thereby simplifying the internal pressure. The structural structure of the foot mechanism is to achieve the purpose of reducing the volume of the entire device.

Description

Inner presser mechanism

The present invention relates to an inner presser foot mechanism mounted to a front end of a sewing machine, and more particularly to an inner presser foot mechanism capable of pressing a sewing object when the needle is pulled out from the sewing machine.

Conventionally, a sewing machine that does not use a feed tooth to drive the cloth to move, in order to prevent friction between the cloth and the needle, causes the cloth to rise together with the needle and generate a jump stitch, and an internal presser device is usually installed.

Generally, when the needle is lowered, once the bottom of the inner presser is in contact with the cloth, the inner presser foot will not continue to descend with the needle, and the state of the fabric is maintained by the elastic force, and When the needle running through the fabric starts to rise, the internal presser foot is also pressed by the elastic force, so that the fabric can be pressed by the inner presser until the needle rises to complete the hook line or leave the fabric, and the inner presser foot As the needle advances to move the fabric, however, in order to accommodate the difference in thickness depending on the number of fabrics or laminates, the inner presser foot needs to have the above-described periodic up and down motion, and also has an adjustable upper and lower stroke height position. Features.

Referring to FIG. 1 and FIG. 2, the inner presser device 10 of the sewing machine is known to have an inner presser foot 11, an inner presser foot rocking member 12, an inner presser foot link member 13, a guide member 14, and a inner portion. a presser foot moving member 15 and a lifting member 16, wherein the inner presser foot link member 13 is disposed between the inner presser foot 11 and the inner presser foot moving member 15, and is composed of two serially connected links 131 and 132 The upper end portion of the guiding member 14 is rotatably mounted on a front end of a sewing machine (not shown), and a vertical hole 141 is formed in the lower end portion, wherein the two links 131 and 132 are formed. The joint portion 133 is slidably mounted in the long hole 141 described above.

The inner presser foot moving member 15 is connected between the guiding member 14 and a driving member 17, and the lifting member 16 has a rotating shaft 161 and an inner presser foot lifting member 162. The rotating shaft 161 passes through a bevel gear set. The drive member 17 is assembled to the drive member 17 and has a lift cam 164, and the inner presser foot lifter 162 is pivotally coupled to the sewing machine and has a contact roller 165 that abuts against the lift cam 164.

The driving member 17 is rotated in a range of 0 to 180 degrees. At this time, although the maintaining portion of the lifting cam 164 is in contact with the contact roller 165, the inner pressing foot lifting member 162 does not rotate. The driving member 17 drives the inner presser foot moving member 15 to move, and drives the long hole 141 of the guiding member 14 to move the joint portion 133 horizontally, and changes the arrangement angle of the two links 131 and 132, thereby adjusting the internal pressure. The height position of the lower position of the foot 11.

Further, when the driving member 17 is rotated within a range of 180 to 360 degrees, the changing portion of the lifting cam 164 contacts the contact roller 165, so that the inner pressing foot lifting member 162 can be rotated, thereby causing the internal pressure. One end of the foot lifter 162 drives the inner presser foot 11 to the retracted position.

However, the above-described internal presser foot device 10 must be coupled with the link member composed of the two links 131, 132 arranged in series by the guide member 14, and the height position of the lower position of the inner presser foot 11 can be adjusted, and The inner presser foot 11 must be moved to the retracted position by the lifting member 16, but the additional guiding member and the structural component of the lifting member 16 are in addition to the overall volume increase of the inner presser foot device 10, and the special guiding member 14 and the structural composition of the lifting member 16 also causes an increase in the cost of production, and therefore, it is necessary to improve the aforementioned deficiency.

The main object of the present invention is to simplify the mechanism design of the inner presser foot mechanism to achieve the purpose of reducing the volume of the entire mechanism, and to simplify the number of components to reduce the manufacturing cost.

In order to achieve the above object, the internal presser foot mechanism of the present invention is assembled to a sewing machine body, and the sewing machine body has an upper shaft and a recess, wherein the inner presser foot mechanism mainly comprises an inner presser foot, a link assembly, and a a swinging assembly, a moving component, a driving source and a cam assembly, wherein the inner pressing leg is used for pressing the sewing material, and the connecting rod assembly is connected between the inner pressing leg, the rocking component and the moving component. The swinging assembly is assembled to the upper shaft, wherein the swinging mechanism moves up and down with the needle of the sewing machine, and the moving component is coupled to the driving source and is displaced by the driving source.

The cam assembly is disposed between the swing assembly and the moving assembly, and has an active cam coupled to the moving assembly and a driven roller coupled to the swing assembly. The active cam can be touched by the movable assembly. Rotating at a preliminary contact position of the driven roller to a contact position contacting the driven roller, so that the swinging assembly and the connecting rod assembly together drive the inner pressing foot to a separation position by pressing the pressing position of the sewing object In the pre-pressed position of the sewing material.

In addition, the swinging assembly is coupled to a resetting assembly, and the resetting assembly can form a resetting force on the swinging assembly, so that when the active cam is located at the preliminary contact position, the swinging component drives the inner presser foot to move to the movable pressing force to The pressing position and the inner pressing leg can continue to be at the pressing position.

In a preferred embodiment, the moving component has a moving link, one end of the moving link is connected to the connecting rod assembly, and an eccentric connected to the driving source is assembled at an end away from the connecting rod assembly, and The eccentric wheel and the active cam are connected to each other.

Furthermore, the rocking assembly has a first rod member and a second rod member that are assembled to each other, the first rod member is coupled to the upper shaft via a swing shaft, and the second rod member is located at the inner presser foot. In the pressing position, one end of the second rod member is in contact with a groove formed in the sewing machine body through the returning force, and the second rod member is connected to the end of the second rod member contacting the groove. The roller is driven and the link assembly is assembled at an end away from the driven roller.

The invention is characterized in that a cam assembly is arranged between the rocking assembly and the moving component, so that the inner presser foot mechanism can still move the inner presser foot between the preliminary pressing position and the pressing position while reducing the overall volume. In addition, when the active cam moves to the contact position through the moving component, the inner presser foot is driven by the rocking assembly and the link assembly to be immediately moved from the pressing position to the preliminary pressing position, and when the active cam transmits the moving component When moving to the preliminary contact position, the resetting component pulls the rocking component through the returning force, so that the inner presser foot can be immediately moved from the preliminary pressing position to the pressing position, thereby replacing the function of the internal presser device of the known sewing machine. .

In order to further clarify and understand the structure, the use and the features of the present invention, the preferred embodiment is described in detail with reference to the following drawings:

Referring to FIG. 3 and FIG. 4, the internal presser foot mechanism 20 of the present invention is used in conjunction with a sewing machine body 30. The sewing machine body 30 has a front end 31 and a base (not shown). The inner presser foot mechanism 20 is assembled inside the front end 31. And having an upper shaft 32 capable of rotating inside, the upper shaft 32 is connected to a needle bar 34 assembled to the front end 31 through a crank shaft link 33, so that the upper shaft 32 drives the needle rod through the crank shaft link 33. 34 is vertically moved toward the base, and as shown, a recess 35 is provided on the front side of the front end 31.

Referring to Figures 4 and 5, the inner presser foot 23 mechanism 20 is mainly composed of a rocking assembly 21, a link assembly 22, an inner presser foot 23, a moving assembly 24, a transmission assembly 25, a cam assembly 26, and A reset component 27 is constructed. As shown, the rocking assembly 21 has a swinging shaft 211. One end of the swinging shaft 211 is assembled with a swing arm link 212, and an adjusting arm 213 is assembled at an end away from the swing arm link 212. The swing arm link 212 is coupled to the upper shaft 32 via an eccentric cam 214 assembled to the upper shaft 32. When the upper shaft 32 rotates, the swing shaft 211 can reciprocate through the eccentric cam 214 and the swing arm link 212. Swinging, the adjusting arm 213 forms an arcuate groove 213a for changing the swinging radius of the adjusting arm 213, and the groove 213a is assembled with a freely rotatable first rod 215, wherein the first rod 215 is One end away from the groove 213a is rotatably connected to a central section of a second rod 216, and the second rod 216 is connected at one end to the link assembly 22 and to an adjustment rod at an end remote from the link assembly 22. One end of the member 217, as shown, adjusts the center of the member 217 Domain through a shaft 218 rotatably mounted to the front of the sewing machine 31, the other end of the adjusting lever 217 is formed a hook portion 217a to install the reset assembly 27.

As shown in FIG. 5, the link assembly 22 is mainly composed of a first connecting member 221 and a second connecting member 222. The first connecting member 221 has a first connecting portion 221a and a second connecting portion 221b. And a third assembly portion 221c, wherein the first assembly portion 221a is coupled to the second rod member 216 of the rocking assembly 21, and the second assembly portion 221b is coupled to the moving assembly 24, the third assembly portion 221c The second connecting member 222 is connected to the inner pressing leg 23 at an end away from the third connecting portion 221c. As shown, the inner pressing leg 23 is disposed in parallel with the needle bar 34.

The moving assembly 24 is provided with a moving link 241 moving toward the second set portion 221b and an eccentric wheel 242 assembled at one end of the moving link 241, and the transmission assembly 25 has a drive shaft 251 capable of rotating and a connection a drive source 252 of the drive shaft 251, wherein the drive shaft 251 is coupled to the eccentric wheel 242 and parallel to the upper shaft 32, wherein the drive source 25 drives the eccentric wheel 242 to rotate, so that the moving link 241 drives the second set of joint portions 221b Moving, thereby changing the angle of the first connecting member 221, as shown, the cam assembly 26 has an active cam 261 and a driven roller 262, and the driving cam 261 is fixedly coupled to the eccentric 242 such that the driving cam 261 passes through the eccentric 242 is coupled to the drive shaft 251, wherein the driving cam 261 has an abutting portion 261a (shown in FIG. 6) that is selectively contactable with the driven roller 262, and the second rod member 216 is away from the first connecting member 221 One end is connected to the driven roller 262. In addition, the resetting assembly 27 has a hook member 271 that is fixed to the front end 31, and a spring 272 is disposed between the hook member 271 and the hook portion 217a of the adjusting rod member 217.

Referring to FIG. 6 , during the sewing operation of the needle bar 34 , the abutting portion 261 a of the driving cam 261 does not contact the driven roller 262 of the cam assembly 26 to position the driving cam 261 at a preliminary contact position P1. The spring 272 of the resetting assembly 27 forms a resetting force 273 on the adjusting rod 217 of the rocking assembly 21, so that the second rod 216 and the adjusting rod 217 both rotate clockwise with the pivot 218 as the axis. Further, the link assembly 22 drives the inner presser foot 23 to move to a pressing position P2, so that the inner presser foot 23 presses against the sewing material 40, and at the same time, the second lever member 216 transmits the returning force to the end of the assembled driven roller 262. 273 is in contact with the wall surface of the groove 35 of the sewing machine body 30. In this state, the swinging shaft 211 of the rocking assembly 21 drives the adjusting arm 213 to swing within a certain angular range, so that the adjusting arm 213 sequentially passes through the first rod. The member 215, the second rod member 216, the first connecting member 221 and the second connecting member 222 drive the inner pressing leg 23 to intermittently move up and down with the rotating upper shaft 32, so that the inner pressing leg 23 can be timely. Separating the sewing material 40, making it easy to move the sewing 40.

Referring to FIG. 7, when the thickness of the sewing material 40 is changed during the sewing operation of the needle bar 34 and the height of the inner pressing leg 23 needs to be changed, the driving source 252 of the transmission assembly 25 drives the transmission shaft 251 of the transmission assembly 25 at Rotation in the range of 0 to 180 degrees causes the eccentric wheel 242 of the moving assembly 24 to rotate clockwise together with the active cam 261 of the cam assembly 26, at which time the abutment portion 261 of the driving cam 261 does not contact the driven roller 262. At the same time, the second rod 216 is still in contact with the wall surface of the groove 35 through the return force 273 at the end of the assembly driven roller 262, and the moving link 241 of the moving assembly 24 faces the second of the first connecting member 221. The connecting portion 221b is moved, so that the first connecting member 221 rotates clockwise with the first connecting portion 221a as a fulcrum, thereby changing the angle of the first connecting member 221, so that the second connecting member 222 drives the inner pressing leg 23 to increase the pressing force. The height position of the position P2, whereby the inner presser foot 23 can change the height position of the pressing position P2 through the link assembly 22 and the moving assembly 24, and when the height position of the pressing position P2 is changed, the inner presser foot 23 Vertical movement distance Cause remains unchanged.

Referring to FIG. 8, the driving source 252 of the transmission assembly 25 drives the transmission shaft 251 of the transmission assembly 25 to rotate in the range of 180 to 360 degrees, so that the eccentric wheel 242 of the moving assembly 24 rotates together with the driving cam 261. The abutting portion 261a is in contact with the driven roller 262, and the driving cam 261 is moved from the preliminary contact position P1 to a contact position P3, so that the second lever member 216 and the adjusting lever member 217 are both pivoted with the pivot 218 as the axis. The counterclockwise rotation causes the spring 272 to extend and elongate, and the link assembly 22 drives the inner presser foot 23 to move to a preliminary pressing position P4 separated from the sewing material 40. At this time, the second rod member 216 is assembled and driven. One end of the roller 262 has no contact with the wall surface of the recess 35.

It can be seen from the action of the inner pressing leg 23 that when the driving shaft 251 of the transmission assembly 25 simultaneously drives the eccentric wheel 242 of the moving assembly 24 and the driving cam 261 of the cam assembly 26 to the contact position P3, the inner pressing leg 23 is subjected to the rocking assembly 21 and The link assembly 22 can be immediately moved from the pressing position P2 to the preliminary pressing position P4, and when the driving cam 261 is moved to the preliminary contact position P1 through the transmission shaft 251, the resetting unit 27 pulls the rocking assembly through the returning force 273. 21, the inner presser foot 23 can be immediately moved from the preliminary pressing position P4 to the pressing position P2, so that the transmission assembly 25 can simultaneously adjust the height position of the inner presser foot 23 at the pressing position P2, and drive the inner presser foot 23 The fully-fed preliminary pressure-receiving position P4 is reached.

10‧‧‧Inside presser device

11‧‧‧Inside presser foot

12‧‧‧Inner presser foot rocking member

13‧‧‧Inner presser foot link member

131, 132‧‧‧ linkage

133‧‧‧Combination Department

14‧‧‧Guiding components

141‧‧‧ long hole

15‧‧‧Inward presser foot moving member

16‧‧‧Uplifting components

161‧‧‧Rotary axis

162‧‧‧Inward presser lifts

163‧‧‧Bevel gear set

164‧‧‧lifting cam

165‧‧‧Contact roller

17‧‧‧ drive components

20‧‧‧Inner presser mechanism

21‧‧‧Swing component

211‧‧‧Swing axis

212‧‧‧Swing arm connecting rod

213‧‧‧Adjustment arm

213a‧‧‧ trench

214‧‧‧Eccentric cam

215‧‧‧First member

216‧‧‧second rod

217‧‧‧Adjustment rods

217a‧‧‧hook

218‧‧‧ fulcrum

22‧‧‧ linkage assembly

221‧‧‧First connector

221a‧‧‧The first set of joints

221b‧‧‧Second joint

221c‧‧‧ third group of joints

222‧‧‧Second connector

23‧‧‧Inside presser foot

24‧‧‧Mobile components

241‧‧‧Mobile Link

242‧‧‧eccentric wheel

25‧‧‧Transmission components

251‧‧‧ drive shaft

252‧‧‧ drive source

26‧‧‧Cam assembly

261‧‧‧Active cam

261a‧‧‧Abutment

262‧‧‧ driven roller

27‧‧‧Return component

271‧‧‧ hanging hooks

272‧‧ ‧ spring

273‧‧‧Returning force

30‧‧‧Sewing machine body

31‧‧‧ head

32‧‧‧Upper axis

33‧‧‧Crankshaft connecting rod

34‧‧‧ needle stick

35‧‧‧ Groove

40‧‧‧Sewing

P1‧‧‧Preparation contact position

P2‧‧‧Resist position

P3‧‧‧Contact location

P4‧‧‧Prepared to resist position

1 and 2 are exploded views of a known internal presser foot device; Fig. 3 is a perspective view of the internal presser foot mechanism of the present invention mounted on a sewing machine; Fig. 4 is a perspective view of the inner presser foot mechanism of the present invention; FIG. 6 is a schematic view of the inner pressing foot abutting the sewing material according to the present invention; FIG. 7 is a schematic view showing the driving cam rotating in the range of 0 to 180 degrees to drive the inner pressing foot; and FIG. 8 is the active cam in FIG. A schematic diagram of rotating the inner presser foot within a range of 180 to 360 degrees.

Claims (4)

An internal presser foot mechanism assembled to a sewing machine body and having an inner presser foot for pressing the sewing material and a link assembly connected to the inner presser foot, the link assembly assembling a rocking assembly and passing through a rocker assembly The moving component is connected to a driving source, and the swinging component is assembled on an upper shaft of the sewing machine body, wherein a cam component is disposed between the rocking component and the moving component, and the cam component has a connection to the driving a source active cam and a driven roller coupled to the rocking assembly, wherein the movable cam is movable through the moving assembly to a contact position contacting the driven roller without contacting the driven roller to a contact position of the driven roller The swing assembly and the link assembly together drive the inner presser foot to move from a pressing position against the sewing material to a preliminary pressing position separated from the sewing material. The internal presser foot mechanism of claim 1, wherein the rocking assembly is coupled to a resetting assembly, and the resetting assembly is capable of forming a returning force on the rocking assembly such that the active cam is located at the preliminary contact position. The rocking assembly moves the inner presser foot to the pressing position by the resetting force, and the inner presser foot can continue to be at the pressing position. The internal presser foot mechanism of claim 1, wherein the rocking assembly has a first rod member and a second rod member assembled to each other, and the first rod member is coupled to the upper shaft via a swing shaft And one end of the second rod is connected to the driven roller, and the connecting rod assembly is assembled at an end away from the driven roller. The internal presser foot mechanism of claim 1, wherein the moving component has a moving link, one end of the moving link is connected to the link assembly, and a connection is assembled at an end away from the link assembly. The eccentric wheel of the driving source is connected to the active cam.