JPH0874Y2 - Fixed blade adjusting device in rotary thread trimming device - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a rotary thread trimming device in which a movable blade is moved in an arcuate path to shear the thread between the movable blade and a fixed blade fixed in the sewing machine bed. The present invention relates to a fixed blade adjusting device capable of adjusting a joining state between a fixed blade and a movable blade.

[0002]

2. Description of the Related Art FIGS. 5 to 8 are views showing a movable blade and a fixed blade of a conventional rotary thread cutting device.
In the figure, 1 is a sewing machine bed, and a needle plate (not shown) is openably and closably attached to the opening 1 a of the sewing machine bed 1. A fixed blade mounting base 2 is fixed to the lower surface of the sewing machine bed 1 with screws 3 and 3, and a fixed blade 4 is also fixed to the lower surface thereof with screws 3 and 3. The fixed blade 4 is made of a flexible plate-shaped member, and has a curved portion 4a and a flat surface portion 4b as shown in FIG. 6, and a blade portion 4a1 is formed at the tip of the curved portion. There is. The blade portion 4a1 is located slightly lateral to the ascending / descending path L of the sewing needle N between the sewing machine hook and the needle plate (not shown).

Reference numeral 5 is a fixed blade adjusting screw screwed into one end of the fixed blade mounting base 2. The fixed blade adjusting screw 5 is located on the flat surface 4b of the fixed blade 4, and the head of the screw is arranged to be exposed from the opening 1a of the sewing machine bed 1 by opening the needle plate.

On the other hand, 7 is a movable blade made of a curved and flexible member, and a yarn dividing portion 7a and a yarn guiding groove 7b are formed at the front end thereof as shown in FIG. At the rear end portion of the groove 7b, there is formed a blade portion 7c slightly protruding upward as shown in FIG. The movable blade 7 is adapted to reciprocate along a circular movement path from a side of the sewing machine hook to a thread cutting position set near the top position of the sewing machine by a thread cutting drive mechanism (not shown). The yarn is located between the needle plate and the sewing machine hook by the forward movement and is cut with the fixed blade 4. That is, when a predetermined thread trimming command is input, the movable blade 7 starts to move forward by the thread trimming drive mechanism and cuts from the thread located between the sewing machine hook and the needle plate by the thread dividing section 7a. The yarn guided to the yarn guide groove 7b is fixed to the blade portion 7c of the movable blade 7 by separating the yarn to be cut into the yarn guide groove 7b and further moving forward by separating the yarn to be cut from the yarn to be cut. Shear between the blade 4 and the blade portion.

In the thread cutting device as described above, in order to properly cut the thread, the blade portion 7 of the movable blade 7 is used.
It is an important condition to make sure that c and the blade portion 4a of the fixed blade 4 are brought into contact with each other. That is, if there is a gap between the blade portion 4a of the fixed blade 4 and the blade portion 7c of the movable blade 7, the yarn cannot be completely cut. Therefore, an adjusting mechanism is required to maintain the relative position between the fixed blade 4 and the movable blade 7 properly, but the movable blade 7 executes the subtle operations such as separating and catching the yarn as described above. It is necessary to adjust the position of the fixed blade 4 because its mounting position is inevitably determined.

Conventionally, the position adjustment of the fixed blade 4 is performed by the adjustment screw 5. That is, during assembly, if there is a gap between the fixed blade 4 and the movable blade 7 or if sufficient contact pressure is not obtained, the screw 5 is screwed downward and fixed at its lower end. Adjustments were made such that the blade 4 is pressed to bend the fixed blade 4 downward as shown by the alternate long and short dash line in FIG.

[0007]

However, there are cases where the movable blade 4 and the fixed blade 7 cannot be properly brought into contact with each other only by the adjustment performed by the screw 6 as described above. That is, with the screw 6, the blade portion 4a of the fixed blade 4 can be moved downward, but the blade portion 4a of the movable blade 4 is moved by the movable blade 7.
When it is attached to the blade portion 7c of the blade in a tilted manner as shown in FIG. 8, this cannot be corrected, and a gap is generated between the blade portions 4a and 7c, or the contact pressure becomes uneven. Inconveniences such as the occurrence of abrasion occurred, and good cutting performance could not be obtained.

For this reason, when the fixed blade 7 is tilted as shown in FIG. 8, an operator twists the fixed blade 7,
Although a method of forcibly correcting the inclination has been adopted, it is extremely difficult to make an accurate correction by such a method in a working environment where the sewing machine bed is narrow, and the blade portion of the fixed blade 4 is also used. There is also a risk of injury. Therefore, in the related art, in order to accurately attach the fixed blade 7 to the movable blade 4, the fixed member 2 and the fixed knife 4 are required to have high precision, resulting in an increase in cost.

This invention was made in view of the above-mentioned problems of the prior art. Even if a tilt occurs between the movable blade and the fixed blade at the time of mounting, the tilt is easily corrected. It is an object of the present invention to provide a fixed blade adjusting device capable of achieving a proper contact state.

[0010]

The present invention reciprocates in an arcuate movement path from a side of the sewing machine hook to a predetermined thread cutting position set near the top position of the sewing machine hook by a predetermined thread cutting command. And a movable blade fixed to the sewing machine bed via a predetermined fixing member, and a fixed blade in which a blade portion formed at one end is in overlapping contact with the blade portion of the movable blade at the thread cutting position. In the thread trimming device, the fixing member has a fixed blade holding base fixed in the sewing machine bed, and a support shaft rotatably inserted in an insertion hole formed in an end surface of the fixed blade holding base. A fixed blade mounting member having a fixed blade mounting portion at one end of the support shaft, and a fastening for fixing the fixed blade mounting member at an arbitrary rotation angle position around the support shaft with respect to the fixed blade holding base. The fixed blade mounting It is intended to integrally fix the fixed blade in wood.

[0011]

In this invention, if the fixed state of the fixed blade mounting member and the fixed blade mounting base by the fastening member is released, the fixed blade is moved in the rotational direction about the support shaft of the fixed blade mounting member. You can Therefore, if there is a tilt between the movable blade and the fixed blade during mounting, first,
After moving the movable blade to the thread cutting position and releasing the fixed state by the fastening member, adjust the position of the fixed blade according to the blade portion of the movable blade, and fix the fixed blade mounting member again with the fastening member. By performing such an extremely simple operation, the fixed blade can be held at an appropriate position.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
It will be explained based on. In addition, in the same part as the above-mentioned conventional example,
The same reference numerals are given and detailed description thereof is omitted. In the figure,
Reference numeral 10 is a fixed blade holding base fixed to the lower surface of the sewing machine bed 1 with screws 9, 9, and a circular shaft insertion hole 10a is formed in the front end surface thereof. Reference numeral 11 is a fixed blade mounting member. The fixed blade mounting member 11 is composed of a plate body 11a and a support shaft 11b vertically projecting from the rear surface of the plate body 11a. The support shaft 11b is a shaft insertion hole 10a formed in the fixed blade holding base 10. It is adapted to be rotatably fitted to. Further, the plate 11a is formed with an arc-shaped elongated hole 11a1 at a position deviated from the center of the support shaft 11b.
A fixing screw 12 that is screwed into a screw hole 10b formed in the front end surface of the fixed blade holding base 10 is inserted into the elongated hole 11a1, and the fixed blade mounting member 11 is inserted by the screw 12. It can be fixed on a fixed blade holder. Therefore, the fixed position of the fixed blade mounting member 11 with respect to the fixed blade holding base 10 is within the range of the elongated hole,
The rotation direction around the support shaft 11b can be appropriately changed.

Reference numeral 13 denotes a fixed blade fixed to the front surface of the fixed blade mounting base. The fixed blade in this embodiment has a curved portion 13b formed by bending a plate-shaped flexible member and forming a blade portion 13a1 at its tip, and a flat surface portion 13b continuous with this, as in the conventional case. , Having a mounting portion 13c that is bent vertically from the flat surface portion 13b,
The mounting portion 13c is firmly fixed to the front surface of the fixed blade mounting base 11 by a fixing screw (fastening member) 14. The fixed blade holder 10 and the fixed blade mounting member 11 constitute a fixed knife mounting member.

Reference numeral 15 is a screw holding plate having one end fixed to the lower surface of the sewing machine bed 1, and a vertical position adjusting screw 16 is screwed to the other end. Like the conventional adjusting screw 5, the vertical position adjusting screw 16 is exposed from the opening of the sewing machine bed, and by moving this downward, the flat surface portion 13b of the fixed blade 13 is pressed downward. The blade portion 13a1 of the fixed blade 13 moves downward. The movable blade 7 shown in FIG. 1 is the same as the conventional one, and its operation is also the same.

Next, the operation will be described based on the above configuration. When the thread cutting operation command is input, the movable blade 7 starts the forward movement along a circular arc path from the side of the sewing machine (not shown) to the vicinity of the top of the sewing machine as in the conventional case, and selects and captures the threads. For example, the captured thread is cut at the thread cutting position where the blade portion 13a of the fixed blade 13 and the blade portion 7a of the movable blade 7 come into contact with each other.

At this time, when the blade portion 13a1 of the fixed blade 13 is not set in an appropriate contact state with the blade portion 7c of the movable blade 7 and is in a tilted state as shown in FIG. Can be corrected for its slope as follows. First, the fixing screw 12 is loosened to release the fixed state of the fixed blade mounting base 11 from the fixed blade holding base 10. After this,
The movable blade 7 is moved to the thread cutting position, the blade portion 7a of the movable blade 7 is overlaid with the blade portion 13a1 of the fixed blade 13, and both blade portions 7
The contact angle of c and 13a1 is maintained appropriately. That is, the fixed blade 1 is arranged so that the gap between the fixed blade 13 and the movable blade 7 becomes uniform.
Position 3. This adjustment can be easily performed by rotating the fixed blade 13 together with the fixed blade mounting member 11 about the support shaft 11b in the X or Y direction (see FIG. 4). After that, the fixing screw 12 is tightened to fix the fixed blade attachment member 11 to the fixed blade holder 10.

As described above, the fixed blade 13 is held at an appropriate angle with respect to the movable blade 7 to obtain a uniform contact pressure. However, if the contact pressure is excessive or insufficient, the vertical position is further increased. The vertical position of the fixed blade may be adjusted by the adjusting screw 16.

In the above embodiment, the support shaft 11b of the fixed blade mounting member 11 is not directly fixed with screws,
Since the plate body 11a is fixed to the fixed blade holding base 10, the support shaft 11b can be smoothly rotated with respect to the fixed blade holding base 10, and the adjustment work can be smoothly performed. , The support shaft 11b to the fixed blade holder 10
It is also possible to directly fix it with a screw or the like that is screwed into the case. Even in that case, the initial object of the present invention can be achieved.

[0019]

As described above, in the present invention, since the position of the fixed blade can be adjusted in the rotational direction with respect to the movable blade of the rotary thread trimmer, the blade portion of the movable blade can be easily adjusted. The state of contact with the blade portion of the fixed blade can be appropriately maintained, and good cutting performance can be obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional side view of a main part of the one shown in FIG.

FIG. 3 is an exploded perspective view of what is shown in FIG.

FIG. 4 is an explanatory front view showing the operation of the fixed blade when adjusting the fixed blade in the embodiment.

FIG. 5 is a perspective view showing a movable blade and a fixed blade of a conventional rotary thread cutting device.

6 is a vertical cross-sectional side view showing a fixed blade adjustment state of the one shown in FIG.

FIG. 7 is a plan view showing a movable blade of the rotary thread cutting device.

FIG. 8 is a partially longitudinal explanatory front view showing a state in which the fixed blade is attached to the movable blade in an inclined state.

[Explanation of symbols]

 7 Movable Blade 7c Blade 10 Fixed Blade Holding 11 Fixed Blade Mounting Member 13 Fixed Blade 13a Blade 14 Fixing Screw (Tightening Member)

Claims (1)

[Scope of utility model registration request] 1. A movable blade reciprocating along an arcuate movement path from a side of the sewing machine hook to a predetermined thread cutting position set near the top position of the sewing machine hook by a predetermined thread cutting command, and inside a sewing machine bed. Is fixed via a predetermined fixing member, and the blade portion formed at one end is provided with the blade portion of the movable blade and a fixed blade that makes overlapping contact at the thread cutting position, and is located between the needle plate and the sewing machine hook. In the rotary thread trimming device, the yarn to be caught by the forward movement of the movable blade, and the captured yarn is sheared by both the fixed blade and the movable blade.
The fixed member, a fixed blade holding base fixed in the sewing machine bed, and a fixed blade mounting member pivotally supported on the end surface of the fixed blade holding base and having a fixed blade mounting portion at one end thereof, And a fastening member for fixing the fixed blade mounting member to an arbitrary rotation angle position with respect to the fixed blade holding base, wherein the fixed blade is integrally fixed to the fixed blade mounting member. Fixed blade adjusting device for rotating type thread trimming device.