TWI611061B - Internal presser device of sewing machine - Google Patents

Description

Internal presser device of sewing machine

The present invention relates to an internal presser foot device mounted on a front end of a sewing machine, and more particularly to a presser foot press device for pressing a sewing object when the needle is pulled out from a sewing machine held by an external presser foot.

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 foot 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; When the needle of 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 follows The needle is moved up to move the fabric. However, in order to cope with the difference in thickness depending on the number of various fabrics or laminates, the inner presser foot needs to have the function of adjusting the height of the upper and lower strokes in addition to the above-described periodic up and down motion.

Referring to FIGS. 1 and 2, the inner presser device 10 of the sewing machine is known to have an inner presser foot 11, an inner presser foot rocking mechanism 12, an inner presser foot link member 13, a guide member 14, and an inner portion. The presser foot moving mechanism 15 is disposed between the inner presser foot 11 and the inner presser foot moving mechanism 15, and is composed of two serially connected links 131 and 132; The upper end portion of the member 14 is rotatably mounted on the front frame 16 of the sewing machine, and the lower end portion is formed with a vertical hole 141 in the vertical direction, and the joint portion 133 between the two links 131, 132 is slidably mounted to In the long hole 141, the inner presser foot moving mechanism 15 is connected between the guide member 14 and a drive source (not shown), and is driven by the drive source to drive the long hole 141 of the guide member 14 to drive the joint portion. The 133 moves horizontally and changes the arrangement angle of the above two links 131, 132, thereby changing the height position of the inner presser foot 11.

However, the above-mentioned internal presser foot device must be combined with the link member 13 composed of the two links arranged in series by the guiding member 14, and the function of adjusting the height position of the inner presser foot 11 can be achieved, but the additional guide member design is provided. In addition to causing an increase in the overall volume of the internal presser foot device, the special-purpose guide member also causes an increase in the manufacturing cost, and therefore, it is necessary to improve the aforementioned deficiency.

The main object of the present invention is to co-construct a link mechanism through different connecting members, so that the inner presser can simultaneously have a periodic up and down motion and a function of adjusting the height of the up and down stroke, thereby simplifying the internal presser device. The mechanism design reduces the volume of the entire device, effectively reducing manufacturing costs and increasing market competitiveness.

Another object of the present invention is to provide a difference in thickness between different connection positions of the connecting members, so that the moving mechanism, the rocking mechanism and the inner pressing foot are located at different connection positions of the vertical planes, so as to avoid mutual interference of different motion strokes.

To achieve the above object, the internal presser device of the sewing machine of the present invention comprises an inner presser foot, a rocking mechanism, a link mechanism and a moving mechanism, wherein the inner presser foot is used to press the sewing material, the swinging mechanism and the sewing machine The needle is moved up and down in a cycle, and the link mechanism is connected between the inner presser foot, the rocking mechanism and the moving mechanism, and the moving mechanism is further connected to a driving source and is driven to be displaced by the driving source.

The present invention is characterized in that the link mechanism is provided with a first connecting member and a second connecting member, wherein the first connecting member has a first connecting portion, a second connecting portion and a third connecting portion. The first set of joints are connected to the swinging mechanism, the second set of joints are connected to the moving mechanism, and the third set of joints is connected to one end of the second connecting member; The connecting member is connected to the inner pressing leg at the other end of the third group connecting portion.

When the moving mechanism drives the second connecting portion of the first connecting member to move in a horizontal direction, the first connecting member rotates with the first connecting portion as a fulcrum, and drives the third connecting portion to change the vertical height. position.

In addition, when the rocking mechanism drives the first assembly of the first connecting member to move along a vertical direction, the third connecting portion of the first connecting member drives the second connecting member to move in a vertical direction.

In addition, the present invention can design different thicknesses of the second set portion and the third set portion of the first connecting member, so that the moving mechanism and the second connecting member are respectively located at different vertical plane positions. Up, so when the first connecting member is rotated, different motion strokes will not interfere with each other.

The first connecting member is an L-shaped rod, and the second connecting portion and the third connecting portion are respectively disposed at opposite ends of the L-shaped rod, and the first connecting portion is disposed on the L When the first set of joints is used as a fulcrum, the second set of joints and the third set of joints can be displaced in a horizontal and vertical direction, respectively.

The invention is characterized in that the simplified design of the link mechanism is composed of a first connecting member and a second connecting member, and the first connecting member forms a three-connecting member, which simplifies the known structure and requires an additional guiding member to be adjusted. The separation distance between the presser foot and the needle plate. In addition, the different connection positions of the first connecting members have differences in thickness, so that mutual interference between the different actions of the moving mechanism, the rocking mechanism and the inner presser foot can be avoided.

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:

First, referring to Fig. 3, the inner presser device 20 of the present invention is mainly disposed at the front end position of the front end of the sewing machine, and is fitted with the upper shaft (not shown) of the sewing machine so that the upper shaft can simultaneously drive the organic belt. The needle bar 32 of the needle and the inner presser device 20 of the present invention.

As shown in the figure, the front end portion of the upper shaft is coupled to a crank shaft 31 and a connecting rod is coupled to the needle bar 32. The middle portion of the upper shaft is fixed with an eccentric cam (not shown) to drive the internal pressure. The rocking mechanism 21 is moved by the foot device 20 in the vertical direction.

Referring to FIG. 4, the rocking mechanism 21 has a rocking shaft 211. One end of the rocking shaft 211 is connected to a reciprocating rocking arm which is driven by the eccentric cam, and the other end is assembled with an arcuate groove. The adjusting arm 212 of the 212a is mounted with a freely rotatable first rod member 213 in the groove 212a of the adjusting arm 212, and the other end of the first rod member 213 is rotatably mounted to a second rod member. The second rod member 214 is connected to a connecting rod mechanism 22 at one end, and the other end is connected to one end of an adjusting rod member 215, and cooperates with the adjusting rod member 215 to abut against the sewing machine casing. Block (not shown). Referring to FIG. 6, the center of the adjusting rod member 215 is rotatably mounted on the casing of the sewing machine through a shaft 216, and a first hook portion 215a is formed at the other end to mount a spring member 217. The other end of the member 217 is attached to a second hook portion 218 fixed to the casing of the sewing machine.

As shown in FIG. 5, the link mechanism 22 of the present invention is 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 group. a connecting portion 221b and a third connecting portion 221c, wherein the first connecting portion 221a is connected to the second rod member 214, and the second connecting portion 221b is connected to a moving mechanism 23; One end of the member 222 is connected to the third connecting portion 221c of the first connecting member 221, and the other opposite end is connected to an inner pressing leg 24.

As shown in FIGS. 5 and 7, the first connecting member 221 is an L-shaped rod, and the second connecting portion 221b and the third connecting portion 221c are respectively disposed at opposite ends of the L-shaped rod. The first assembly portion 221a is disposed at a turning point of the L-shaped rod member such that the first assembly portion 221a is located between the second assembly portion 221b and the third assembly portion 221c. Further, the thickness of both the second set portion 221b and the third set portion 221c are different, so that the moving mechanism 23 and the second connecting member 222 are respectively located at different vertical plane positions. Thereby, the rocking mechanism 21, the moving mechanism 23, and the inner presser foot 24 are located at the connection positions of different vertical planes, thereby preventing the mutual movement of the different motion strokes from occurring.

Referring to FIG. 8, the moving mechanism 23 is provided with a moving link 231 that moves toward the second connecting portion 221b, and an eccentric wheel 232 is connected to the other end of the moving link 231. The eccentric 232 is mounted on the moving rod 232. One shaft member 233 has one end, and the other end of the shaft member 233 is connected to a motor (not shown) as a driving source.

As shown in FIG. 5, the inner pressing leg 24 is provided with a mounting plate 241 assembled with the second connecting member 222, and a pressing rod connecting member 242 is connected by the mounting plate 241, and the pressing rod connecting member 242 is mounted with a pressing rod connecting member 242. A pressing rod 243 extending in the vertical direction of the upper and lower sides, a bottom portion of the pressing rod 243 is assembled with a presser foot 244 for pressing the cloth onto the needle plate.

Referring to FIG. 8 , the inner presser device 20 of the present invention can drive the shaft member 233 to rotate the eccentric wheel 232 through the motor, so that the moving link 231 faces the second set portion 221 b of the first connecting member 221 . Make a horizontal movement. At this time, it is assumed that the swing mechanism 21 is in a stationary state without performing any operation, and the first connector 221 starts clockwise rotation with the first assembly portion 221a as a fulcrum, and the first connector 221 The three sets of joints 221c will rotate clockwise in synchronization, thereby raising the vertical height position of the third set of joints 221c. Thereby, the second connecting member 222 is vertically moved in the up and down direction, so that the pressing rod connecting member 242 is synchronously moved upward in the up and down direction. Thereby, the height of the gap between the presser foot 244 and the needle plate can be increased.

Referring to FIG. 9, the internal presser foot device 20 of the present invention drives the eccentric cam to rotate through the upper shaft, so that the rocking shaft 211 of the rocking mechanism 21 is rocked, and when the adjusting arm 212 follows the rocking shaft 211 for clockwise shaking. The first rod member 213 will move in the downward direction, and the left end of the second rod member 214 is pulled by the adjusting rod member 215 and the spring member 217, and the right end of the second rod member 214 will be at the left end. A clockwise yaw is performed as a fulcrum to drive the link mechanism 22 to move downward, and the first connecting member 221 of the link mechanism 22 is maintained at a rotation angle by the movement mechanism 23, and the connecting rod is The second connecting member 222 of the mechanism 22 will be displaced by the first connecting member 221 to generate a downward displacement, so that the pressing leg 244 can be moved downward with the downward displacement of the needle bar 32 until the cloth is pressed against the needle. The position of the board.

Referring to FIG. 10, after the presser foot 244 is engaged with the needle bar 32 to lower the cloth against the needle plate, the presser foot 244 will not continue to descend with the needle, and if the adjusting arm 212 is still driven. The first rod 213 will move in the downward direction, and the right end of the second rod 214 will be unable to move in the downward direction due to the link mechanism 22 and the inner presser foot 24, and the left end of the second rod 214 The counterclockwise yaw will be performed with the right end as a fulcrum. Since the center receiving shaft 216 of the adjusting lever member 215 is pivoted to the casing of the sewing machine, the adjusting lever member 215 will be synchronized with the second lever member 214. The counterclockwise rotation and extension of the spring member 217 are performed to absorb the excess inner presser foot 24 stroke.

The swinging mechanism 21 of the present invention can drive the first connecting portion 221a of the first connecting member 221 to move along a vertical direction, and the second connecting portion 221b is restricted by the moving link 231. At the same time, the third connecting portion 221c of the first connecting member 221 is restricted, and the second connecting member 222 is driven to synchronously drive the inner pressing leg 24 to vertically move in the vertical direction. In summary, the groove 212a of the adjusting arm 212 is used to set the distance between the up and down stroke of the presser foot 244, and the eccentric wheel 232 is used to drive the moving link 231 to set the height position of the presser foot 244 up and down, and the range of the stroke exceeds the needle. The portion below the deck is then absorbed by the spring member 217.

[study]
10‧‧‧Inside presser device
11‧‧‧Inside presser foot
12‧‧‧Inner presser foot shake mechanism
13‧‧‧Inner presser foot link member
131‧‧‧ Connecting rod
132‧‧‧ linkage
133‧‧‧Combination Department
14‧‧‧Guiding components
141‧‧‧ long hole
15‧‧‧Inward presser foot moving mechanism
16‧‧‧Frame (present invention)
20‧‧‧Inner presser device
21‧‧‧Swing mechanism
211‧‧‧Shake axis
212‧‧‧Adjustment arm
212a‧‧‧ trench
213‧‧‧First member
214‧‧‧Second bars
215‧‧‧Adjustment rods
215a‧‧‧The first hook
216‧‧‧ fulcrum
217‧‧‧Spring parts
218‧‧‧Second hook
22‧‧‧ linkage mechanism
221‧‧‧First connector
221a‧‧‧The first set of joints
221b‧‧‧Second joint
221c‧‧‧ third group of joints
222‧‧‧Second connector
23‧‧‧Mobile agencies
231‧‧‧Mobile Link
232‧‧‧eccentric
233‧‧‧ shaft parts
24‧‧‧Inside presser foot
241‧‧‧Installation board
242‧‧‧Post rod connector
243‧‧‧Press
244‧‧‧Foot press
30‧‧‧ front
31‧‧‧ crankshaft
32‧‧‧ needle stick

1 is a perspective view of a conventional presser foot device mounted on a sewing machine head; FIG. 2 is an exploded view of the presser foot device of FIG. 1; FIG. 3 is a perspective view of the inner presser device of the sewing machine of the present invention mounted on a sewing machine head; FIG. 5 is an exploded view of the swinging mechanism, the moving mechanism, the link mechanism and the inner presser foot of the present invention; FIG. 6 is an exploded view of the rocking mechanism of FIG. 5; Figure 8 is a side view of the linkage mechanism of Figure 5; Figure 8 is a schematic view of the internal presser foot device of the present invention driven by the moving mechanism; Figure 9 is a schematic view of the action of the swing mechanism of the present invention swaying downward to drive the displacement of the inner presser foot; The invention discloses a schematic diagram of the action of the rocking mechanism swaying downward and the inner pressing foot abutting the ejector pin.

20‧‧‧Inner presser device

21‧‧‧Swing mechanism

211‧‧‧Shake axis

212‧‧‧Adjustment arm

212a‧‧‧ trench

213‧‧‧First member

214‧‧‧Second bars

215‧‧‧Adjustment rods

215a‧‧‧The first hook

217‧‧‧Spring parts

218‧‧‧Second hook

22‧‧‧ linkage mechanism

221‧‧‧First connector

222‧‧‧Second connector

23‧‧‧Mobile agencies

231‧‧‧Mobile Link

232‧‧‧eccentric

233‧‧‧ shaft parts

24‧‧‧Inside presser foot

241‧‧‧Installation board

242‧‧‧Post rod connector

243‧‧‧Press

244‧‧‧Foot press

Claims (3)

An internal presser device for a sewing machine, comprising: an inner presser foot for pressing the sewing material; and a rocking mechanism for moving up and down in the same period as the needle, wherein the inner presser foot and the rocking mechanism are connected to each other by a link mechanism The swinging mechanism is connected to an upper shaft capable of driving the needle, wherein the connecting rod mechanism is further connected to a moving mechanism, and the moving mechanism is driven by a driving source, wherein the connecting rod mechanism comprises: The first connecting member has a first connecting portion, a second connecting portion and a third connecting portion, wherein the first connecting portion and the swinging mechanism are connected to each other, and the second connecting portion and the moving mechanism are connected to each other And a second connecting member, one end is connected to the third connecting portion of the first connecting member, and the other opposite end is connected to the inner pressing leg; when the swinging mechanism drives the first connecting portion of the first connecting member Moving along a vertical direction, the third connecting portion of the first connecting member drives the second connecting member to move in a vertical direction synchronously, and when the moving mechanism drives the second connecting member Portion is moved along a lateral direction, the first connection member will be assembled with said first portion as a fulcrum for rotation, the third set of driven portions vary the vertical height position. The inner presser device of the sewing machine according to the first aspect of the invention, wherein the thickness of the second set of joints and the third set of joints are different, such that the moving mechanism and the second connecting member are respectively different The vertical plane position. The internal presser device of the sewing machine according to the first aspect of the invention, wherein the first connecting member is an L-shaped rod, and the second connecting portion and the third connecting portion are respectively disposed on the L-shaped portion. The two opposite ends of the rod are disposed at a turning point of the L-shaped rod, such that the first set of joints is located between the second set of joints and the third set of joints.