KR20090031278A - Sewing machine - Google Patents

Abstract

A sewing machine is provided to improve work efficiency without separate adjustment operation by controlling an eccentric cam installed in a gear box. A sewing machine includes the followings: a vertical moving device of a needle moving the needle up and down; an upper shaft(10) delivering power to the needle vertical device; a shuttle rotating unit rotating the shuttle in predetermined timing; a lower shaft(4) delivering the power to the shuttle rotating unit; a motor connected to the upper shaft; an upper shaft sprocket(1); a lower shaft sprocket(3); a timing belt(2); a positioning pin; and a pin hole(33) inserting the positioning pin.

Description

Sewing machine {SEWING MACHINE}

The present invention relates to a sewing machine having a mechanism for matching the phase of the needle and the kiln of the sewing machine.

In a conventional sewing machine using a semi-rotary kiln, the needle of the sewing machine is moved by the rotational motion of the motor and the sewing machine can be sewn by reciprocating the kiln provided under the base part at a predetermined timing. One).

7 is a configuration example of the upper and lower shaft mechanisms of the sewing machine in the above-mentioned document.

The sewing machine includes an upper shaft, an upper shaft sprocket 101, a timing belt 102, a lower shaft sprocket 103, a lower shaft 104, a gear box 105, an eccentric cam 106, and a crank (not shown). A rod 107, a large pendulum shaft 108, a large pendulum gear 109, various bearings, washers, screws, and the like.

In addition, the description of the prior art described herein describes only the matters necessary to minimize the phase of the upper and lower shafts for driving the needle and the kiln of the sewing machine.

In addition, the direction in which the upper shaft and the lower shaft are fixed to the upper shaft sprocket 101 and the lower shaft sprocket 103 is orthogonal to the Z axis direction, the X axis and the Z axis to the direction in which the timing belt connects the upper shaft sprocket and the lower shaft sprocket. The direction to make is the Y-axis direction.

The upper shaft sprocket 101 is fixed by screws 101a and 101a with respect to the upper shaft, which is not shown, to which rotation driving force is applied from the sewing machine motor, and the lower shaft sprocket 103 is screwed 103a and 103a relative to the lower shaft 104. The rotational motion of the motor (not shown) connected to the upper shaft and fixed to the upper shaft is transmitted to the lower shaft by a timing belt 102 connecting the upper shaft sprocket 101 and the lower shaft sprocket 103.

Moreover, the eccentric cam 106 assembled to the gearbox 105 is being fixed to the lower shaft 104 by the screw 106a. The eccentric cam 106 imparts a circumferential motion about the lower shaft 104 with respect to one end of the crank rod 107 sliding to the eccentric cam 106 by the rotational movement of the lower shaft 104. As for the crank rod 107, the other end part 107a is connected with the pin part 109b of the large pendulum gear 109 fixed to the large pendulum shaft 108 by the screw 109a, and of the crank rod 107 By oscillation, the pendulum gear 109 reciprocates about the pendulum shaft 108. The gear portion 109c of the large pendulum gear 109 is connected to a lower shaft gear (not shown), and the lower shaft gear is connected to a mechanism for driving a kiln (not shown), and the kiln is reciprocated by the reciprocating motion of the large pendulum gear 109. Reciprocates.

That is, when the upper shaft is rotated by the motor, as is well known, the needle of the sewing machine moves up and down, and the rotational movement of the upper shaft sprocket is transmitted to the lower shaft sprocket through the timing belt 102, and the rotational movement of the lower shaft is the eccentric cam ( 106 and the crank rod 107 to oscillate and swing the pin portion 109b of the large pendulum gear to reciprocate the large pendulum gear 109, the reciprocating motion being connected to the lower pendulum gear 109 By reciprocating the kiln by the gear at a predetermined timing, the needle and the kiln are followed in a predetermined phase, so that sewing by the sewing machine is possible.

[Patent Document 1] Japanese Patent Laid-Open No. 2003-236280

By the way, in a sewing machine using a kiln, when the sewing needle is at a predetermined position (a position which has started to rise slightly through the bottom dead center), the state of attachment of the kiln is adjusted so that the cutting edge of the kiln crosses the shanghai path of the needle. So-called tailoring work is necessary. In the semi-rotary kiln, the thread loop formed when the needle rises from the bottom dead center to a predetermined height is captured by forward swinging the tip of the semi-rotary kiln, so it is necessary to align the tip of the needle and the kiln at this timing. However, in the semi-rotating kiln oscillating in this way, when the phases of the upper and lower shafts are out of phase, the anti-rotation kiln starts the retraction oscillation at the timing of capturing the real loop by the tip of the kiln, or the catch timing. It becomes impossible to make the tip of the knife in the catching position, and the fitting work becomes difficult.

That is, in the semi-rotary kiln, phase matching between the upper and lower shafts is mandatory. Therefore, if the upper and lower shafts are out of phase, the upper and lower shafts must be phase-aligned before the upper and lower shafts. Occurred.

In the prior art, when the phase alignment operation is performed, the upper shaft sprocket 101 and the lower shaft sprocket 103 have screws 101a, 101a, and 103a with respect to the flat portions provided on the upper shaft and the lower shaft 104, which are not shown. Each screw and the sprocket are fixed so that the angle does not deviate with respect to the rotational direction by pressing 103a). On the other hand, the eccentric cam 106 is fixed to the lower shaft by providing the pressing screw 106a pressed against the circumferential surface of the lower shaft 104 to the lower shaft, so that the flat portion is not formed on the lower shaft side, thereby pressing the screw ( Phase alignment is performed by releasing 106a) to adjust the angle of the eccentric cam 106.

However, when a sudden load is applied to each of the rotating and reciprocating parts due to the sudden stop of the sewing machine during the sewing operation for some reason, the eccentric cam 106 fixed by the push screw 106a is lowered. There was a problem that the phases of the needle and the hook were shifted as the angle was unintentionally shifted toward the 104 in the rotational direction.

In addition, in order to adjust the phase shift, the shift between the eccentric cam 106 and the lower shaft 104 assembled in the gearbox 105 provided at the core of the sewing machine foundation is to be adjusted. Although the parts of the box 105 have to be removed several times and the upper shaft is fixed during the adjustment, there is no method for fixing the upper shaft, such as poor workability and easy assembly errors. There was a problem.

In addition, the phase shift of the upper and lower shafts is caused by the fact that the timing belt changes as the solution changes. In this case, the operation of maintaining the tension of the timing belt by shifting the position of the timing belt pulley is performed. It is necessary. BACKGROUND ART As a sewing machine using a semi-rotary kiln, many cycle sewing machines form a special sewing shape while conveying a base cloth in a planar free direction. Since such a cycle sewing machine has many parts such as cloth moving mechanisms built into the sewing machine main body, the sewing machine main body becomes heavy and the work of tilting the sewing machine main body in adjusting the belt pulley is difficult, and at the same time, the worker feels tired. Is given.

Further, in the cycle sewing machine, since the cloth moving mechanism and the like are arranged in the sewing machine bed, such a device interferes with the phase adjusting operation, thereby significantly reducing the work efficiency.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems so that phase adjustment of needles and kilns can be easily and surely performed, thereby improving work efficiency and preventing occurrence of problems due to work.

The invention according to claim 1 is a sewing machine body comprising an arm portion, a standing body portion, and a bed portion, a needle capable of moving up and down, an upper shaft connected to move the needle up and down, and rotatably supported, and a shanghai diameter of the needle. Semi-rotary kilns having a knife point intersecting with the furnace, Rotationally supported lower shaft and kiln oscillation connecting between the semi-rotary kiln and the lower shaft so as to swing the semi-rotary kiln at a predetermined timing in accordance with the rotation of the lower shaft. A mechanism, a motor connected to either the upper or lower shaft, a first timing pulley fixed to the upper shaft, a second timing pulley fixed to the lower shaft, and both timing pulleys, A sewing machine having a timing belt for transmitting one rotation to the other, wherein the position and the holding for maintaining the rotation of the lower shaft at a predetermined angle A rotation holding member that is movable to a release position and operable outside the bed portion in one position, an opening opening to the arm portion upper surface from above the standing body portion, a removable cover covering the opening, and the first In order to be able to fix the timing pulley at any angle with respect to the rotational direction of the upper shaft and to release the fixing, a fixing member connected to the first timing pulley is operable to be operated outside the arm part frame. ,

The fixing member can be fixed or released in a state where the lower shaft is fixed at a predetermined angle by the rotation holding member.

Invention of Claim 2 is equipped with the indicator means for adjusting an upper axis to a predetermined angle at the time of angle adjustment of the said upper axis and a lower axis. It is characterized by the above-mentioned.

According to the invention of claim 1, in the sewing machine having a semi-rotary kiln, the attachment to the upper shaft can be adjusted by operating the first timing pulley on the outer side of the arm with respect to the upper shaft while the lower shaft is held by the rotation holding member. Therefore, by simply removing the top cover of the sewing machine without removing several parts of the sewing machine base part, the fixing member is operated from the outside to assemble the timing pulley with respect to the upper axis, or the readjustment due to the phase shift is very easy and reliable. Can be done. Therefore, it is possible to adjust the eccentric cam disposed in the gearbox as in the prior art, there is no need to adjust the work is improved work efficiency. In addition, since there is no need to lift the sewing machine body, the work becomes easy and the worker's fatigue can be prevented.

In addition, since the rotation holding member keeps the rotation of the lower shaft at a predetermined angle by operation outside the bed, the transmission wheel of the upper shaft is assembled with respect to the upper shaft as described above, or the readjustment is performed according to the phase shift. In this case, since the lower shaft does not rotate, workability is improved and assembly error of phase alignment is reduced.

According to the invention as set forth in claim 2, in order to adjust the upper and lower shafts at an angle, an indicator means for fitting the upper shaft to a predetermined angle is provided, so that in addition to the effect of the invention as set forth in claim 1, the lower shaft is held by the rotation holding member. By holding and holding the upper and upper transmission wheels at a predetermined angle according to the position indicated by the indicator means, the phases of the needle and the hook can be easily matched, resulting in better workability and reducing assembly errors in phase alignment. do.

(Overall Configuration of Embodiments of the Invention)

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, the main body frame 50 of the sewing machine includes a bed portion 51, a standing body portion 52 that stands up from one end of the bed portion 51, and a bed portion from an upper end portion of the standing body portion 52. The arm part 53 provided in the same direction as 51 is provided.

Here, the Z axis | shaft and the direction orthogonal to a Y-axis, a Z-axis, and a Y-axis are made into the direction which the standing body part 52 stands up, and the X-axis is a direction in which the arm part 53 is installed.

The arm part 53 is provided with the opening part 53a in the part located above the standing body part 52, and is provided with the upper surface cover 54 which covers the opening part 53a. The upper cover 54 is fixed to the arm portion 53 by screwing four corners.

In addition, the main body frame 50 is connected to the upper shaft 10 and has a pulley 55 to allow the operator to manually adjust the rotation angle of the upper shaft 10.

Since the features related to the sewing operation by the sewing machine of each part shown in FIG. 2 are the same as in the prior art, only the features related to the phase adjustment will be described here.

In addition, since the gearbox 105, the crank rod 107, the large pendulum shaft 108, the large pendulum gear 109, and the accessories thereof are the same as in the prior art, the description and the same reference numerals as those in the prior art are duplicated. The description will be omitted.

In FIG. 2, the upper shaft 10 is provided in the Y-axis direction inside the arm portion 53, and is connected to a motor and a needle moving mechanism not shown. The motor is rotated by the control of the sewing machine controller not shown, and imparts a rotational movement to the upper shaft (10). The needle shank-dong mechanism in which the rotational motion of the upper shaft 10 is transmitted converts the rotational motion into the shank-dong motion and transmits it to the needle 56 to make sewing.

The lower shaft 4 penetrates the bed 51 and is installed in the Y-axis direction, and likewise supports the eccentric cam 6 assembled to the gearbox 105 installed inside the bed 51. The flat part 4b is provided in the predetermined position of the lower shaft 4 which supports the eccentric cam 6, and the eccentric cam 6 is the lower shaft 4 by pressing the screw 6a to the flat part 4b. The angle is fixed so as not to shift the angle with respect to. When the lower shaft 4 rotates, the eccentric cam 6 fixed to the lower shaft 4 is a circumference centering on the lower shaft 104 with respect to one end of the crank rod 107 sliding with the eccentric cam 6. By imparting a motion, a reciprocating motion is imparted to the kiln as is well known. In addition, the structure which the lower shaft 4 rotates is mentioned later.

(Transmission wheel and power transmission means)

The upper shaft sprocket 1 is provided with a hole through which the upper shaft 10 penetrates, and flange portions 1b and 1b for holding and fixing the upper shaft 10 at both ends thereof. The upper shaft sprocket 1 is held and fixed to the upper shaft 10 by the screw 1a, and the screw 1a can be loosened to adjust the angle. As described above, when the upper shaft 10 rotates, the upper shaft sprocket 1 also rotates, and the lower shaft sprocket passes through an endless timing belt 2 that spans between the upper shaft sprocket 1 and the lower shaft sprocket 3. Rotational motion is transmitted to (3).

The lower shaft sprocket 3 is fixed so as not to shift the angle with respect to the lower shaft 4 by pressing one of the screws 3a against the flat portion 4a provided on the lower shaft 4, and through the timing belt 2. The lower shaft sprocket 3 and the lower shaft 4 also rotate by the rotational movement of the transmitted upper shaft 10 and upper shaft sprocket 1. In addition, the lower shaft 4 is provided with a flat portion 4a so that the lower shaft sprocket 3 is fixed at a predetermined angle with respect to the lower shaft 4, but the upper shaft 10 is not provided with a flat portion, whereby the upper shaft The upper shaft sprocket 1 can be adjusted at any angle with respect to (10). Due to such a difference in structure, when the sewing machine in sewing operation suddenly stops for some reason, and a sudden load is applied to each part performing the rotational motion and the reciprocating motion, the lower shaft sprocket 3 is connected to the lower shaft 4. Although the deviation of the angle with respect to the upper shaft is more firmly prevented, the upper shaft sprocket 1 is held fixed with respect to the upper shaft 10, so that sufficient strength can be obtained to maintain the angle after adjustment. Thus, the upper shaft sprocket 1 functions as the first transmission wheel, the lower shaft sprocket 3 as the second transmission wheel, and the timing belt 2 functions as the power transmission means.

In addition, the diameter and the number of gears of the upper shaft sprocket 1 and the lower shaft sprocket 3 are the same. Accordingly, if the upper shaft rotates once, the lower shaft also rotates once.

In addition, the upper shaft sprocket 1 is fixed to a position located below the opening portion 53a in the upper shaft 10 provided in the arm portion 53. That is, when the upper cover 54 is peeled off by the operator, the upper shaft sprocket 1 fixed to the upper shaft 10 is seen through the opening 53a to adjust the angle.

(Phase of needle and semi-rotary kiln)

Next, the phase adjustment of the sewing machine will be described in detail with reference to FIGS. 2 and 3.

3 is a side view showing the phase relationship between the needle 56 and the semi-rotary kiln 61 of the sewing machine.

The needle 56 is connected to the above-described needle shank-dong mechanism, and when the upper shaft 10 rotates, the rotary motion is converted to shanghai-dong movement by the needle shang-dong mechanism, and the shank-dong movement is transmitted to the needle 56. The needle 56 is known as the shanghai-dong during sewing.

The anti-rotation kiln 61 installed in the kiln part 60 is provided to the counter pendulum 109 assembled to the gearbox 105 as in the prior art by a lower shaft gear (not shown) connected to the kiln part 60. As the reciprocating motion of the magnetic gear 109c is transmitted, the half rotary kiln 61 connected to the large pendulum shaft 108 makes a reciprocating rotation (swinging) motion. That is, each part assembled in the gearbox 105 including the lower shaft gear and the large pendulum 109 not shown functions as a "kiln swing mechanism".

In the well-known sewing operation, the needle 56 is lowered by the above-mentioned shanghai copper mechanism and ascends through the sewing material not shown and lowered to a predetermined position. At this time, the sewing thread (T) forms a loop (L) in accordance with the vertical movement of the needle 56, the needle rotation is formed as is known by the rotating semi-rotary kiln (61) to capture the loop (L).

That is, in order to accurately obtain the timing at which the semi-rotary kiln 61 catches the loop L formed by the sewing thread T according to the shangdong of the needle 56, the shanghai-dong and the semi-rotary kiln ( Correct needle stitch is formed only by performing phase adjustment to adjust the timing of the reciprocating rotational motion of 61).

In addition, when the upper shaft 10 rotates once, the shankdong movement of the needle 56 is reciprocated one time, and when the lower shaft 4 rotates once, the reciprocating rotational movement of the half rotary kiln 61 is configured to be reciprocated. That is, as the upper shaft 10 rotates once, the lower shaft 4 also rotates once, thereby reciprocating the reciprocating rotational movement of the semi-rotary kiln 61 while reciprocating the Shanghai-dong movement of the needle 56.

(Rotation holding means)

4 is a perspective view showing the structure around the portion where the bed portion 51 and the standing body portion 52 of the body frame 50 are joined.

As shown in FIG. 4, the pin hole 32 as a circular hole is formed in the predetermined position of the side of the bed part 51. As shown in FIG. Moreover, the pin hole 33 which is a circular hole is formed in the lower shaft 4 in the part located in the extension line with respect to the X-axis direction from the pin hole 32 formed in the bed part 51. As shown in FIG. At this time, the inside diameters of the pin hole 32 and the pin hole 33 are substantially the same. In addition, the positioning pin 31 is provided as a separate component. The positioning pin 31 is a cylindrical pin having a diameter insertable into the pin hole 32 and the circular hole of the pin hole 33.

The pin hole 32 penetrates the side surface of the bed part 51, and the rotation of the lower shaft 4 as the positioning pin 31 inserted into the pin hole 32 is further inserted into the pin hole 33 of the lower shaft. Fix it. At this time, the lower shaft 4 maintains a predetermined angle with respect to the bed portion 51 by the positioning pin 31, whereby the positioning pin 31 is a pin hole 32 of the bed portion 51 The pin hole 33 of the lower shaft 4 functions as a "rotation holding means."

That is, the above-mentioned "predetermined angle" is the position just before the knife tip of the half-turn kiln 61 captures the loop L in the above-described phase adjustment (state where the tip of the knife tip becomes the best position (position in FIG. 3)). Is set to

Moreover, the pin hole 33 of the lower shaft 4 is formed in the part located on the extension line with respect to the X-axis direction from the pin hole 32 formed in the bed part 51, In addition, the rotating shaft of the lower shaft 4 It is preferable that the center of the pinhole 33 is located in the position which overlaps with.

In addition, it is desirable that the clearance generated between the positioning pin 31 and each of the pin holes 32 and 33 be extremely small.

In addition, although the pin hole 33 does not penetrate the lower shaft 4 in an Example, it may penetrate. In this case, the positioning pin 31 is fixed by contacting the positioning pin 31 with the lower surface portion of the bed 51.

In addition, the pin hole 32 and the pin hole 33 are circular holes to correspond to the cylindrical positioning pin 31, but the pin hole 32 and the pin hole in the shape of the positioning pin 31. If (33) is matched, the shape is not limited to that.

In addition, when the lower shaft 4 is held at a predetermined angle by the rotation holding means, the lower shaft sprocket 3 is also held, and the upper shaft sprocket 1 is also held by the timing belt 2. At this time, it is preferable to set so that the screw head of the screw 1a of the upper shaft sprocket 1 may be located upwards with respect to a Z-axis direction. This facilitates the tightening and loosening of the screw 1a of the upper shaft sprocket 1 after the lower shaft is fixed by the rotation holding means.

(Means of indicator)

5 is a perspective view showing the opening 53a of the upper body with the top cover 54 removed.

The indicator means 20 is provided in the side frame provided inside the opening 53a, in which the upper shaft 10 of the side frame close to the side where the pulley 55 is provided among the side surfaces through which the upper shaft 10 passes. The indicator mark 21 provided on the circumference of a hole part, and the indicator mark 22 which are provided in the upper shaft 10 and are closest to the indicator mark 21 by a predetermined angle are comprised.

At this time, the above-mentioned "predetermined angle", the sewing thread in which the position of the needle 56 for performing the shank movement in conjunction with the rotational movement of the upper shaft 10 passes through the needle 56 in the above-described phase adjustment ( It is set so that T) may become the position (position of FIG. 3) which forms the loop L. FIG.

That is, by holding the lower shaft 4 by the rotation holding means, the semi-rotary kiln 61 is held in the position of FIG. 3, and as the screw 1a of the upper shaft sprocket 1 becomes loose, the upper shaft sprocket 1 and The needle 56 is adjusted to the position of FIG. 3 by coinciding the indicator mark 21 with the indicator mark 22 while the upper shaft 10 is not fixed. Then, the screw 1a is tightened to tighten the upper shaft sprocket 1. By fixing the upper shaft 10 to the upper shaft 10, the phases of the needle 56 and the semi-rotary kiln 61 can be easily adjusted.

In addition, the side frame inside the opening 53a in which the indicator mark 21 is provided may be a side frame near the side where the needle 56 is provided among the side surfaces through which the upper shaft 10 penetrates.

In addition, although the position of the indicator mark 21 can be anywhere in the circumference | surroundings of the hole part which can be matched with the indicator mark 22 provided in the upper axis, in the state which removed the upper cover 54, an operator can easily confirm. It is preferable that it is provided in the position.

In addition, in the above-described embodiment, both the indicator mark 21 and the indicator mark 22 are point marks, but the shape of the mark is irrelevant as long as it becomes an indicator for adjusting the upper axis 10 at a predetermined angle. For example, the vertices of the facing arrows may be aligned.

Furthermore, in the installation of the indicator means 20, since the sewing machine may be shifted according to the machining accuracy or the assembly error, the phase is accurately adjusted once before installing the indicator means 20 for each machine body of the sewing machine. It is then preferable to provide the indicator means 20 on the upper shaft 10 and the side frame. This enables accurate phase adjustment that is not dependent on part machining accuracy or assembly error.

(Order of phase adjustment)

Next, the procedure for adjusting phase is demonstrated.

When it is confirmed by the operator that the phases of the needle 56 and the semi-rotary kiln 61 are out of phase, the operator removes the upper cover 54 so that the upper shaft sprocket 1 is visible from the opening 53a.

Then, the operator operates the pulley 55 to rotate the upper shaft 10, and adjusts the lower shaft 4 to rotate at an angle at which the positioning pin 31 can be inserted into the pin hole 33 of the lower shaft 4. do.

Next, the positioning pin 31 is inserted into the pin hole 32 of the bed portion 51, and the pin hole 33 and the positioning pin 31 of the lower shaft 4 are engaged with each other to make a semi-rotation kiln. 61 holds the lower shaft 4 at a predetermined rotational angle held in the position of FIG. At this time, the screw head of the screw 1a of the upper shaft sprocket 1 is located above.

Next, the worker unscrews the screw 1a of the upper shaft sprocket 1, whereby the upper shaft sprocket 1 is in a state where it is not fixed to the upper shaft 10. Thereafter, the pulley 55 is operated by the operator so that the position of the indicator mark 22 provided on the upper shaft 10 and the indicator mark 21 provided on the side frame are adjusted so that the angle of the upper shaft 10 is adjusted. . The screw 1a of the upper shaft sprocket 1 is tightened by an operator at an angle at which the indicator mark 21 and the indicator mark 22 coincide with each other, and the upper shaft sprocket 1 is fixed to the upper shaft 10 by holding.

In this case, the phases of the needle and the hook may be visually checked and further finely adjusted by manipulating the pulley 55. Accordingly, the phase shift between the needle 56 and the semi-rotary kiln 61 is eliminated, so that accurate sewing can be performed. Therefore, the upper shaft sprocket 1 which can adjust the angle fixed with respect to the upper shaft 10 functions as an adjustment means.

(Effect)

According to the above embodiment, since the upper shaft sprocket 1 is held and fixed at an angle with respect to the rotation direction of the upper shaft 10, the eccentric cam 6 disposed in the gear box 105 can be adjusted as in the prior art. It is not necessary to perform the adjustment work, and the upper shaft sprocket 1 is attached to the upper shaft 10 by simply removing the upper cover 54 of the sewing machine without removing some of the parts of the bed 51 of the sewing machine. Can be adjusted, and readjustment according to the phase shift can be performed.

Moreover, since the necessity of fixing the eccentric cam 6 with the screw pressed against the peripheral surface of the lower shaft 4 is eliminated, the eccentric cam 6 and the lower shaft 4 are provided by providing the flat part 4b in the lower shaft 4. It can also be fixed so that the angle does not shift, and there is no phase error due to the slip.

Furthermore, since the upper shaft sprocket 1 is fixed to the upper shaft 10 in a holding manner, the tightening force is improved as compared to the push screw fixing according to the prior art, and the phase shift due to the load is less likely to occur.

Moreover, since the positioning pin 31, the pin hole 32, and the pin hole 33 which hold | maintain the rotation of the lower shaft 4 at a predetermined angle is provided, the upper shaft sprocket 1 is made into the upper shaft ( When holding is fixed to 10) or when readjusting due to phase shift is performed, the lower shaft 4 does not rotate, so that workability is good and assembly error of phase alignment is reduced.

In addition, the indicator mark 21 and the indicator mark 22 which serve as indicator means in the angle adjustment of the side frame inside the opening part 53a and the upper shaft 10 at the time of phase adjustment are provided, In addition, with respect to the lower shaft 4 held by the positioning pin 31 so that the anti-rotation kiln 61 is in a predetermined position, the angle of the upper shaft in accordance with the position indicated by the indicator mark 21 and the indicator mark 22. By holding the upper shaft sprocket 1 with respect to the upper shaft 10 by adjusting the pressure, the phase of the needle 56 and the kiln 61 can be easily matched, and the workability is further improved and the assembly error of phase alignment is improved. Is reduced.

(Other embodiment)

Another embodiment of the rotation holding means will be described with reference to FIG. 6. The same configuration as the previous embodiment will be denoted by the same reference numerals and redundant description thereof will be omitted.

In another embodiment, as shown in Fig. 6A, the bed portion 51 is provided with a lower shaft fixed switch 30A. The lower shaft fixed switch 30A is a cylindrical pin hole 31A capable of engaging with the pin hole 33 of the lower shaft 4 and a cylindrical through hole formed in the upper surface portion of the bed 51, and the lower shaft fixed switch 30A. As the 30A is fitted, the lower shaft fixed switch 30A is provided in the switch hole 32A capable of reciprocating in the Z-axis direction, and inside the bed portion 51A, and the lower shaft fixed switch 30A is provided. It is comprised by the control part 34A which switches the position of the lower axis | shaft fixed switch 30A in the Z-axis direction every time it presses downward, and the spring 35A which is an elastic member which pushes up the lower axis fixed switch 30A upwards. .

When the lower shaft fixing switch 30A is pushed downward, as shown in FIG. 6B, the control section 34A maintains the spring 35A in a reduced state, and the pin portion 31A holds the pin of the lower shaft 4. By engaging with the hole 33, the rotation angle of the lower shaft 4 is maintained. In addition, by installing the well-known return mechanism applied to the knock-type ballpoint pen or the like to the switch 30A, when the lower shaft fixed switch 30A is pressed again, the state of FIG. Not maintained.

In such a configuration, in addition to the same effects as in the previous embodiment, since the need for installing the positioning pin 31 as a separate component is eliminated, the lower shaft 4 is lost due to the loss of the positioning pin 31 by mistake. It does not happen that it cannot be fixed, and the convenience is further improved.

(Etc)

In addition, the pin holes 32 and 33 formed in the bed part 51 and the lower shaft 4 are not limited to a hole, and a structure or a means does not matter if a lower shaft is maintained at a predetermined angle. It may be any releasable fitting structure, such as a groove, by artificial manipulation.

In addition, the positioning pin 31 for engaging the lower shaft 4 and the bed part 51 is not limited to the above-mentioned example, For example, a screw etc. may be sufficient.

Moreover, the rotation holding means should just be able to hold | maintain the lower shaft 4 at a predetermined angle, for example, you may provide the dedicated component, and may hold | maintain the lower shaft 4.

In addition, the rotation holding means is not limited to the lower shaft 4, and any operation or member from the upper shaft sprocket 1 to the kiln may be regulated for the kiln.

Further, in the above embodiment, the motor is connected to the upper shaft, but may be connected to the lower shaft.

In addition, in the above-mentioned example, although the sprocket is used as a transmission wheel and the timing belt is used as a power transmission means, if embodiment rotation is transmitted to the other side, it does not matter.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which showed the side view of the sewing machine which is embodiment of this invention.

2 is a perspective view of each part interlocked with the upper shaft 10, the lower shaft 4 and the rotational movement of the upper shaft 10 and the lower shaft 4 of the sewing machine installed in the main frame 50.

3 is a side view showing the positional relationship between the needle 56 and the semi-rotary kiln 61 of the sewing machine.

4 is a perspective view showing a configuration around a portion where the bed portion 51 and the standing body portion 52 of the main body frame 50 are joined.

5 is a perspective view showing the opening 53a of the upper body with the upper cover 54 removed.

6 is a perspective view showing a lower shaft fixed switch 30A, which is another embodiment of the rotation holding means.

Figure 7 is a perspective view of each part in conjunction with the upper shaft 10, the lower shaft 4 and the rotary motion of the upper shaft 10 and the lower shaft 4 of the conventional sewing machine.

Explanation of symbols on the main parts of the drawings

1: upper shaft sprocket 2: timing belt

3: lower shaft sprocket 4: lower shaft

6: eccentric cam 10: upper shaft

21, 22: Indicator mark 31: Positioning pin

32, 33: pin hole 54: top cover

56 needle 61: half-turn

Claims (2)

A sewing machine body comprising an arm part and a standing body part and a bed part, a needle capable of moving up and down, an upper shaft connected to move the needle up and down, and rotatably supported, and a knife tip crossable with respect to the shanghai path of the needle; A semi-rotating kiln having a rotatable kiln, a lower shaft supported rotatably, and a kiln oscillating mechanism for connecting the half-rotating kiln and the lower shaft to oscillate the semi-rotary kiln at a predetermined timing in accordance with the rotation of the lower shaft; Alternatively, the motor connected to any one of the lower shafts, the first timing pulley fixed to the upper shaft, the second timing pulley fixed to the lower shaft, and the two timing pulleys are different from each other to rotate the upper shaft or the lower shaft. A sewing machine having a timing belt for transmitting to the side, A rotation holding member which is movable to a position for maintaining the rotation of the lower shaft at a predetermined angle and a position for releasing the holding and operable at an outside of the bed portion to one position; An opening opening from the upper portion of the standing body portion to an upper surface of the arm portion; A removable cover covering the opening; In order to be able to fix the first timing pulley at an angle with respect to the rotational direction of the upper shaft and to release the fixing, a fixing member connected to the first timing pulley to be operable outside the arm unit frame is provided. Equipped, Sewing machine characterized in that the fixing member can be fixed or released in a state in which the lower shaft is fixed at a predetermined angle by the rotation holding member. The method of claim 1, And an indicator means for adjusting the upper shaft to a predetermined angle at the time of adjusting the angle between the upper shaft and the lower shaft.

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