JP2009072428A - Sewing machine intermediate presser - Google Patents

Abstract

An object of the present invention is to prevent a change in the pressure of the intermediate presser against the cloth when the intermediate presser of the sewing machine is pressed against a step or the like of the sewing product, for example, when the thickness of the cloth changes during sewing. .
An intermediate presser 19 that presses a cloth against a needle plate by an urging force of a spring 27 at the time of sewing, an intermediate presser vertical movement mechanism M1 that moves the intermediate presser 19 up and down according to a needle that moves up and down by rotation of a main shaft, An intermediate presser lowering position adjustment mechanism M2 that adjusts the lowering position of the intermediate presser 19 by moving the lowering position of the presser foot 19 in the vertical direction according to the thickness of the cloth. An intermediate presser shaft 28 that is rotatably supported by the arm, an intermediate presser lifting lever 22 that is fixed to the end of the intermediate presser shaft 28, and an intermediate presser lifting lever 22 that is disposed in proximity to the intermediate presser shaft 28. An intermediate presser lever 23 that is rotatably fitted and a spring hook 24 that is rotatably provided on the intermediate presser lifting lever 22, and a spring 27 is disposed between the spring hook 24 and the intermediate presser lever 23.
[Selection] Figure 1

Description

  The present invention relates to an intermediate presser of a sewing machine, and more particularly to an intermediate presser of a sewing machine that does not change an urging force against the intermediate presser and does not change a pressure applied to a sewing product.

  In sewing machines such as embroidery sewing machines that perform sewing while transporting the cloth in the X and Y directions without using a feed dog, the needle is lifted to prevent the cloth from rising and fluttering with the needle due to friction with the needle. An intermediate presser device is sometimes provided to press down the periphery of the needle penetration portion of the cloth downward. This device normally presses the cloth downward by an intermediate presser when the needle is lifted from the cloth, and the intermediate presser is lifted together with the needle after the needle is completely lifted from the cloth.

  As a conventional example of such an intermediate presser, a device has been proposed in which the lowering position of the intermediate presser can be adjusted in accordance with the cloth thickness by displacing the center of the intermediate presser in a substantially horizontal direction (for example, , See Patent Document 1).

  As another conventional example, a device that reduces the force required to retract the intermediate presser by moving one end of the urging means that holds the intermediate presser in a fixed position in a direction in which the elastic force decreases is proposed. (For example, refer to Patent Document 2).

JP 7-178272 A (paragraph 0010, FIG. 1) JP 2007-159710 A (paragraph 0005, FIG. 1)

  However, in the intermediate presser disclosed in Patent Document 1, when the lowering position of the intermediate presser is changed during the sewing operation of the sewing machine, the urging force for the intermediate presser changes, and the pressure on the sewing product, for example, the cloth changes. It has a problem to do.

  Further, in the intermediate press device disclosed in Patent Document 2, although the force required to retract the intermediate presser is reduced, there is a problem that the mechanism becomes very complicated.

  The present invention provides an intermediate presser for a sewing machine that solves the problems of the above-mentioned conventional apparatus by disposing an urging means in a peristaltic mechanism.

  The intermediate presser of the sewing machine according to the present invention includes an intermediate presser that presses the sewing product against the needle plate by the urging force of the urging means at the time of sewing, In an intermediate presser device of a sewing machine comprising a presser vertical movement mechanism and an intermediate presser lowering position adjusting mechanism for adjusting the intermediate presser lowering position by moving the lowering position of the intermediate presser in the vertical direction according to the thickness of the cloth. The biasing means is configured integrally with the intermediate presser lowering position adjusting mechanism.

  According to the intermediate presser device of the sewing machine according to the present invention, when the intermediate presser is pressed against the step of the cloth, for example, when the thickness of the cloth changes during sewing, It is possible to prevent damage to the intermediate presser without changing the pressure.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of an intermediate presser of a sewing machine according to the invention will be described with reference to the drawings. The present invention is not limited to the embodiments.

Embodiment 1.
1 is a perspective view of an intermediate presser device for a sewing machine according to Embodiment 1 of the present invention, and FIG. 2 is a front view thereof. First, the overall structure of the intermediate presser of the sewing machine will be described with reference to FIGS.

<Overall configuration of intermediate presser device>
As shown in FIG. 1 and FIG. 2, the intermediate presser 1 of the sewing machine according to the present embodiment is aligned with an intermediate presser 19 that presses a sewing product, for example, a cloth against a needle plate, and a sewing needle that moves up and down by the rotation of the main shaft. An intermediate presser vertical movement mechanism M1 that moves the intermediate presser 19 up and down and an intermediate presser lowering position adjustment mechanism M2 that adjusts the lowering position of the intermediate presser are provided.

Next, the structure of the intermediate presser vertical movement mechanism M1 will be described.
<Configuration of intermediate presser vertical motion mechanism>
The intermediate presser vertical movement mechanism M1 is provided on the upper shaft 2 that drives a needle bar, which is provided with a sewing needle at the tip, in the vertical direction. An eccentric cam 3 is fixed to the upper shaft 2, and a connection link 4 is connected to the eccentric cam 3. A peristaltic shaft holder 5 is connected to the connection link 4, and one end of a peristaltic shaft 6 is connected to the peristaltic shaft holder 5. A groove cam 5a for adjusting the amount of movement of the intermediate presser 19 in the vertical direction D1 is formed on the peristaltic shaft holder 5. The groove cam 5a is an arc-shaped long hole, and one end of the connection link 4 is pivotally supported by an adjusting nut 7 and a step screw 8 at a desired position of the groove cam 5a. In addition, the axial support position of this connection link 4 can be adjusted along the groove cam 5a.

  A swing arm 9 is fixed to the other end of the swing shaft 6. One end of the link 10 is connected to the swing arm 9 by a step screw 11, and the upper portion of the swing body 12 forming an inverted L-shaped link is connected to the other end of the link 10. The left end portion of the sliding body 12 is connected to the upper portion of the link 13, and the central swing center C <b> 1 is connected to the right end portion of the link 14 by a step screw 20. The other end of the link 14 is connected to a sewing machine arm (not shown) and a step screw 15, and the other end of the link 13 is connected to the intermediate presser bar holder 16 by a step screw 17. The intermediate presser bar holder 16 holds an intermediate presser bar 18 extending downward. An intermediate presser 19 is attached to the lower end portion of the intermediate presser bar 18 to press the cloth against the needle plate during sewing. The swing center C1 of the swing body 12 is held at a fixed position by an intermediate presser lowering position adjusting mechanism M2 described later.

  With the above configuration, when the upper shaft 2 rotates, the connection link 4 connected to the eccentric cam 3 performs a peristaltic motion. This peristaltic movement of the connecting link 4 is transmitted to the peristaltic shaft holder 5, and at the same time, the peristaltic arm 9 is also perturbed. This motion is transmitted to the link 10, and the peristaltic body 12 perturbs about the peristaltic center C1, and the link 13 moves up and down. By the movement of the link 13 in the vertical direction, the presser bar clamp 16, the presser bar 18, and the intermediate presser 19 connected to the link 13 move in the D1 direction.

Next, the configuration of the intermediate presser lowering position adjusting mechanism M2 will be described.
<Configuration of intermediate presser lowering position adjustment mechanism>
The intermediate presser lowering position adjusting mechanism M2 adjusts the intermediate presser lowering position by moving the sliding center C1 of the sliding body 12 in the vertical direction according to the thickness of the cloth. The intermediate presser shaft 28 is rotatably supported by a sewing machine arm (not shown). An intermediate presser lifting lever 22 is fixed to the end of the intermediate presser shaft 28, and the intermediate presser lever 23 is fitted to the intermediate presser shaft 28 so as to be rotatable in the vicinity thereof. On the intermediate presser lifting lever 22, a spring hook 24 is rotatably installed by a step screw 25 and is arranged so that its angle can be adjusted by an adjusting screw 26. In addition, a spring 27 as an urging means for the intermediate presser 19 is installed at the tip of the spring hook 24 and the intermediate presser lever 23. The square piece 21 is clamped by the spring 27, and the biasing force of the spring 27 is adjusted by an adjustment screw 26. Thus, the intermediate presser lowering position adjusting mechanism M2 and the spring 27 are integrally configured.

  The step screw 20 connects the swing center C <b> 1 of the swing body 12 and the square piece 21. The square piece 21 is sandwiched between an intermediate presser lifting lever 22 and an intermediate presser lever 23. On the other hand, a fan gear 29 is fixed to the other end of the intermediate presser shaft 28. A small gear 31 fixed to the shaft of the motor 30 is engaged with the fan gear 29.

  The motor 30 employs a pulse motor, and can be rotated in forward and reverse directions, and the amount of rotation and drive timing can be controlled by a control unit (not shown). By arbitrarily controlling the angle of the intermediate presser lifting lever 22 by the motor 30, the square piece 21, that is, the rotation center C1 of the sliding body 12, can be freely moved up and down, and the intermediate presser lowering position can be adjusted.

  The intermediate presser of the sewing machine according to the first embodiment is configured as described above, and when the intermediate presser 19 moves up and down during normal sewing, the square piece 21 is held by the elastic force of the spring 27. Maintain state. Since the attachment length of the spring 27 is constant regardless of the intermediate presser lowered position, that is, the position of the square piece 21, the urging force to the intermediate presser 19 does not change and the pressure on the cloth does not change. Then, when the intermediate presser 19 is pressed against an obstacle that cannot be lowered to the planned bottom dead center position, for example, against a cloth step, the square piece 21 resists the elastic force of the spring 27. By moving away from the intermediate presser lifting lever 22 along the rotation of the link 14, the intermediate presser 19 can be released upward. Thereby, damage to the intermediate presser 19 is prevented.

  Further, since the intermediate presser can be retracted by the same operation as changing the lowered position, a special mechanism for retracting the intermediate presser is not required. At this time, since the attachment length of the spring 27 does not change, it is not necessary to apply a force against the spring 27.

  As described above, the intermediate presser of the sewing machine according to the first embodiment can be used even when the intermediate presser 19 is pressed against a cloth step or the like, for example, when the thickness of the cloth changes during sewing. Further, the pressure of the intermediate presser 19 against the cloth is not changed, and the breakage of the intermediate presser 19 can be prevented.

Embodiment 2. FIG.
Next, Embodiment 2 will be described with reference to FIG.
As shown in FIG. 3, the movement of the peristaltic center C1 of the peristaltic body 12 shown in FIG. 1 may be replaced with vertical movement by rack and pinion instead of rotational movement by the arm. In the second embodiment, the square piece 21 is sandwiched between the moving body moving base 32 and the moving body presser 33. The movable body presser 33 is movable up and down along a shaft 34 fixed to the movable body moving base 32, and the square piece 21 is moved to the movable body moving base 32 by a spring 35 installed around the shaft 34. Pressed.

  A rack 36 is fixed to the movable body moving base 32, and a pinion 37 is engaged therewith. The pinion 37 can be controlled in rotation amount and drive timing by a pulse motor, and can move the swing center C1 in the vertical direction. Other configurations are the same as those in the first embodiment, and a description thereof will be omitted.

  With the configuration as described above, the intermediate presser device of the sewing machine according to the second embodiment also has the same effect as the intermediate presser device of the sewing machine according to the first embodiment.

  INDUSTRIAL APPLICABILITY The intermediate presser device of the sewing machine according to the present invention can be used for a sewing machine that sews sewn products having different thicknesses at a sewing position.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an intermediate presser for a sewing machine for explaining Embodiment 1 of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of an intermediate presser for a sewing machine for explaining Embodiment 1 of the present invention. It is a front view of the intermediate presser of the sewing machine explaining Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intermediate presser device 2 Upper shaft 3 Eccentric cam 4 Connection link 5 Peristaltic shaft holding 6 Peristaltic shaft 7 Adjustment nut 8 Step screw 9 Peristaltic arm 10 Link 11 Step screw 12 Peristaltic body 13 Link 14 Link 15 Step screw 16 Presser rod holding 17 step Screw 18 Intermediate presser bar 19 Intermediate presser 20 Step screw 21 Square piece 22 Intermediate presser lifting lever 23 Intermediate presser lever 24 Spring hook 25 Step screw 26 Adjustment screw 27 Spring 28 Intermediate presser shaft 29 Fan gear 30 Motor 31 Small gear 32 Moving body movement Base 33 Rotating body presser 34 Shaft 35 Spring 36 Rack 37 Pinion C1 Rotating center D1 of oscillating body 12 Intermediate presser vertical direction M1 Intermediate presser vertical movement mechanism M2 Intermediate presser lowering position adjusting mechanism

Claims (3)

An intermediate presser that presses the sewing product against the needle plate by the urging force of the urging means during sewing, an intermediate presser vertical movement mechanism that moves the intermediate presser up and down according to the needle that moves up and down by the rotation of the spindle, and lowering of the intermediate presser In the intermediate presser device of the sewing machine having the intermediate presser lowering position adjusting mechanism that moves the position in the vertical direction according to the thickness of the cloth and adjusts the intermediate presser lowering position,
An intermediate presser device for a sewing machine, wherein the urging means is formed integrally with the intermediate presser lowering position adjusting mechanism. The intermediate presser lowering position adjusting mechanism is disposed adjacent to the intermediate presser shaft rotatably supported by the sewing machine arm, an intermediate presser lifting lever fixed to the end of the intermediate presser shaft, and the intermediate presser lifting lever. An intermediate presser lever that is rotatably fitted to the intermediate presser shaft, and a spring hook that is rotatably provided on the intermediate presser lifting lever.
2. The intermediate presser device of the sewing machine according to claim 1, wherein the biasing means is disposed between the spring hook and the intermediate presser lever.   The intermediate presser device of the sewing machine according to claim 2, wherein an adjustment screw is provided on the intermediate presser lifting lever to adjust a rotation angle of the spring hook.

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