JP4769543B2 - Cloth cutting knife device for sewing machine - Google Patents

Description

  The present invention relates to a cloth cutting knife device for a sewing machine.

  Conventionally, a flat stitching sewing machine has a fixed knife having a cutting edge at the upper end, a moving knife that cuts into and out of the needle plate surface from the lower side and meshes with the fixed knife, and interlocks with the sewing machine drive. The sewing machine is equipped with a transmission mechanism that applies a swinging force to the moving knife, and is equipped with a sewing machine cloth cutting knife device that sequentially cuts the workpieces conveyed on the needle plate (see, for example, Patent Document 1).

The transmission mechanism includes a link mechanism having a swing shaft and a rotation shaft that transmits power to the moving knife in synchronization with the vertical movement of the needle, and almost all of the transmission mechanism is stored in a housing that surrounds the outside of the transmission mechanism. It is arranged near the needle plate of the sewing machine bed.
Further, the link mechanism includes a moving knife driving shaft that has one end fixed to the base end portion of the moving knife and applies a swinging force to the moving knife, and a link member that applies rotational force to the moving knife drive shaft. Yes. The moving knife drive shaft is rotatably supported by the housing along the longitudinal direction of the sewing machine bed. On the other hand, the link member is configured to apply rotational force to the moving knife drive shaft by swinging the other end portion around the moving knife drive shaft fixed to one end thereof. The other end of the link member is rotatably connected to another link member via a thrust pin.
A thrust receiver that urges the link members in a direction in close contact with each other is in contact with the connecting portion at the other end of the link member along the axial direction of the thrust pin.
Japanese Utility Model Publication No. 63-177477

By the way, the thrust receiver in the above-described conventional sewing machine cloth cutting knife device is arranged to be fitted to the inner wall of the housing from the inside of the housing. For this reason, when assembling the transmission mechanism in the housing, first, the thrust receivers are fitted to the inner walls facing both ends of the thrust pin in the housing, and then the link members are inserted between the thrust receivers. Assembly was performed.
Since the housing has a sealed structure so that the lubricating oil that lubricates the transmission mechanism does not leak to the outside, each internal configuration can be adjusted from the outside of the housing after the housing is attached to the sewing machine. There was a problem that workability was not good.

  An object of the present invention is to easily assemble a cloth cutting knife device of a sewing machine.

  In order to solve the above-mentioned problem, the invention according to claim 1 is provided with a fixed knife fixedly installed in the vicinity of a needle drop position, and provided to be able to cut a sewing object by swinging and slidingly contacting the fixed knife. A moving knife, a moving knife drive shaft that supports the moving knife so as to be swingable, first and second links that impart a rotating motion to the moving knife drive shaft, the first and second links, In a cloth cutting knife device for a sewing machine having a housing surrounding the moving knife drive shaft and a pair of receiving members slidably contacted from both axial sides of the connecting shaft of the first and second links, The housing includes fitting portions into which the pair of receiving members are respectively fitted, and at least one fitting portion opens to the outside of the housing and is fitted into the opening fitting portion. The receiving member is detachable from the outside of the housing A cloth cutting knife device of the sewing machine, characterized in that there.

  According to a second aspect of the present invention, in the cloth cutting knife device of the sewing machine according to the first aspect, the sewing machine includes a fixing means for fixing the receiving member to the opening, and the opening is provided so that the receiving member can be inserted therethrough. It is characterized by being.

  According to invention of Claim 1, a pair of receiving member is each fitted by the fitting part provided in the housing. Further, at least one receiving member is freely attached to and detached from the outside of the housing to a fitting portion opened to the outside of the housing. Accordingly, for example, when the first and second links and the moving knife drive shaft are assembled to the housing, the area of the receiving member occupying the housing can be reduced, and sufficient work for performing the assembly in the housing. Space can be secured. Therefore, the workability of the assembly work can be improved. Further, the visibility inside the housing from the outside of the housing by the operator can be improved. This facilitates the assembly work of the first and second links and the moving knife drive shaft housed in the housing as compared with a conventional sewing machine cloth cutting knife device in which the inside of the housing could not be visually confirmed. The work efficiency can be improved.

  According to the second aspect of the present invention, the same effect as that of the first aspect of the invention can be obtained, and in particular, the cloth cutting knife device of the sewing machine includes the fixing means so that the receiving member can be opened. Can be fixed to. Thereby, an opening part can be made into the magnitude | size which can receive a receiving member, ie, a larger opening part. Therefore, workability when assembling each component in the housing and visibility inside the housing from the outside of the housing can be further improved.

  Hereinafter, the best mode of a cloth cutting knife device 1 (hereinafter simply referred to as a cloth cutting knife device 1) according to the present invention will be described in detail with reference to FIGS. In the present embodiment, a right knife device that cuts the cloth on the right side of the sewing needle 4 in the cloth feeding direction will be described as an example. In addition, the direction in which the sewing needle 4 moves up and down with respect to a needle plate 3 to be described later and performs needle drop is defined as the Z-axis direction (vertical direction), and the cloth feed direction orthogonal to the Z-axis direction is defined as the X-axis direction (front-rear direction). The direction orthogonal to both the X-axis direction and the Z-axis direction will be described as the Y-axis direction (left-right direction).

(Overall configuration of the embodiment)
As shown in FIG. 1, the cloth cutting knife device 1 is disposed in the vicinity of a needle plate 3 provided on a bed portion 2 of a sewing machine frame. In FIG. 1, the front side of the paper is the upstream side in the cloth feeding direction, that is, the operator's work position, and the needle plate 3 has an upper surface parallel to the XY plane. Further, the needle plate 3 is formed with an opening in the vicinity of a needle hole H where the sewing needle 4 drops in the vertical direction, and a cutting edge 21 formed at the tip of the moving knife 20 which will be described later is interlocked with the sewing machine operation. Thus, it is possible to appear at the upper side of the needle plate 3.
The cloth cutting knife device 1 includes a fixed knife 10 fixedly provided near the needle drop position, and a moving knife 20 provided so as to be able to cut a cloth as a sewing object by swinging and slidingly contacting the fixed knife 10. And a moving knife drive mechanism 30 that imparts a swinging motion to the moving knife 20 and a housing 40 that surrounds the moving knife drive mechanism 30 constitute a main part. Hereinafter, each part will be described in detail.

(Fixed knife)
As shown in FIGS. 2 and 3, the fixed knife 10 is a long plate-like member, and the one end in the longitudinal direction (the upper end in FIGS. 2 and 3) is the cutting edge 11. The fixed knife 10 is arranged so that the blade edge 11 is substantially parallel to the cloth conveyance direction, that is, the X-axis direction, and the cutting position with the moving knife 20 described later is substantially the same height as the upper surface of the needle plate 3. In this way, the fixed knife mounting base 12 is fixed.

(Moving knife and moving knife drive mechanism)
As shown in FIG. 2, the moving knife 20 is fixed to one end (right end) of a moving knife drive shaft 31 of a moving knife drive mechanism 30 described later in an insertion hole 22 formed in the base end portion thereof. Further, a hook-shaped portion that is curved in a bowl shape is formed at the tip of the moving knife 20, and the upper side of the hook-shaped portion is a cutting edge 21.
The moving knife 20 is swung around the base end side by a moving knife driving mechanism 30 to be described later, and the cutting edge 21 at the distal end is reciprocated substantially vertically. When the blade 21 descends in the swinging motion, the blade 21 comes into sliding contact with the blade 11 of the fixed knife 10 described above, so that the fabric conveyed on the needle plate 3 is cut by a conveyance mechanism (not shown). Yes.

The moving knife drive mechanism 30 holds the moving knife 20 and supports a moving knife drive shaft 31 that is rotatably supported with respect to the housing 40, and a rotating operation that interlocks with the sewing machine operation with respect to the moving knife drive shaft 31. And a link mechanism 32 to be provided.
The moving knife drive shaft 31 is a round bar-shaped shaft member, and its longitudinal direction is arranged in parallel with the Y-axis direction. The moving knife drive shaft 31 penetrates a side wall of a housing 40, which will be described later, in the vicinity of both ends in the longitudinal direction in the Y-axis direction, and is supported so as to be able to rotate and slide in a thrust direction by a bearing (not shown) in the through-hole portion. ing.

The link mechanism 32 is provided as a transmission mechanism that transmits the power of a sewing machine motor (not shown) to the moving knife drive shaft 31.
As shown in FIGS. 3 and 4, the link mechanism 32 includes a drive arm 34 as a first link that applies a turning force in a direction around the axis to the moving knife drive shaft 31. One end of the drive arm 34 is fixedly connected to a substantially central portion in the longitudinal direction of the moving knife drive shaft 31, and the other end is connected to one end of a link 36 as a second link via a link pin 35. It is connected freely. A link pin 37 is rotatably connected to the other end of the link 36.
The link pin 37 is connected to a swinging end portion of a swinging arm fixedly connected to a rotating shaft that reciprocally rotates using a sewing machine motor as a drive source.
When a sewing motor (not shown) is driven, the link pin 37 is swung back and forth substantially along the X-axis direction. This swing is transmitted to the lower end of the drive arm 34 via the link 36 and the link pin 35, and the lower end portion swings. As a result, reciprocating rotational force is applied to the moving knife drive shaft 31 connected to the upper end of the drive arm 34.

As shown in FIG. 3, the thrust receivers 39a and 39b are slidably abutted on both sides of the connecting portion from the axial direction (thrust direction) of the link pin 35 in the connecting portion, that is, the Y-axis direction. Yes. That is, the thrust receiver 39a is in contact with the link 36 from the right side (left side in FIG. 3), and the thrust receiver 39b is in contact with the lower end of the drive arm 34 from the left side (right side in FIG. 3). .
These thrust receivers 39 a and 39 b have a function of preventing the shake in the Y-axis direction at the connecting portion between the drive shaft 34 and the link 36 accompanying the driving of the moving knife 20.
The thrust receiver 39a has a cylindrical shape that is substantially the same diameter as the contact surface, that is, a substantially cylindrical shape, and the thrust receiver 39b has a shape having a large diameter contact portion and a small diameter shaft portion.

(housing)
The housing 40 surrounds almost the entire transmission mechanism and supports the fixed knife mounting base 12, the moving knife drive shaft 31 and the thrust receivers 39a and 39b described above, and is disposed on the operator side of the bed portion 2. (See Figure 1).
The housing 40 in this embodiment is a fitting portion in which the thrust receivers 39a and 39b are fitted on the inner side wall of the housing 40 in the thrust direction of the link pin 35 that connects the drive arm 34 and the link 36 described above. The fitting portion into which one of the thrust receivers 39 a is fitted is an opening 41 that penetrates to the outside of the housing 40.

The opening 41 is formed on the right side surface of the housing 40, and has the same diameter as the contact surface on which the thrust receiver 39 a described above contacts the link 36. In other words, the opening 41 detachably supports the thrust receiver 39 a from the outside of the housing 40 and allows the thrust receiver 39 a to be inserted from the outside of the housing 40 to the inside.
Furthermore, the housing 40 in this embodiment is provided with fixing screws 42a and 42b for fixing the thrust receivers 39a and 39b to the openings 41a and 41b (not shown).
The fixing screws 42a and 42b are screwed through screw holes formed on the side surface of the housing 40 on the operator side, and are brought into contact with the peripheral surfaces of the thrust receivers 39a and 39b so that the thrust receivers 39a and 39b are opened to the openings 41a and 39a. It is provided as a fixing means for fixing to 41b. That is, the fixing screws 42a and 42b are provided to restrict and release the movement of the thrust receivers 39a and 39b in the Y-axis direction, that is, in the thrust direction.

Next, operation | movement of the cloth cutting knife apparatus 1 which is this embodiment is demonstrated.
First, the link pin 37 is swung back and forth by driving a sewing machine motor (not shown). In response to this, the lower end of the drive arm 34 is swung back and forth via the link pin 35 connected to one end of the link 36. By such swinging, the moving knife drive shaft 31 fixed to the upper end of the drive arm 34 reciprocates around the axis. Furthermore, the moving knife 20 connected to one end of the moving knife drive shaft 31 is swung, and the blade edge 21 provided at the tip thereof reciprocates substantially in the vertical direction.
When the cutting edge 21 is lowered during the swinging movement of the moving knife 20, the cutting edge 21 is brought into sliding contact with the cutting edge 11 of the fixed knife 10, so that the cloth conveyed on the needle plate 3 by the conveyance mechanism (not shown) is cut. Done.

Next, an operation when the moving knife drive mechanism 30 is assembled to the housing 40 will be described.
In the cloth cutting knife device 1 according to the present embodiment, the moving knife drive mechanism 30 is assembled with the thrust receiver 39a removed. In other words, the thrust receiver 39 a is finally attached from the outside of the housing 40 in the assembly work of the moving knife drive mechanism 30 to the housing 40. Thereby, a sufficient working space for assembling the moving knife drive mechanism 30 is secured in the housing 40.
In particular, when assembling the connecting portion between the lower end of the drive arm 34 and the link 36 as compared with the conventional cloth cutting knife device, since there is a margin in the thrust direction, the assembly can be easily performed.
In addition, as shown in FIG. 5, the operator can work while visually confirming the inside of the housing 40 through the opening 41 from the outside of the housing 40.

As described above, according to the cloth cutting knife device 1 for a sewing machine according to the present embodiment, when the moving knife driving mechanism 30 is assembled to the housing 40, the area of the thrust receiver 39a in the housing 40 can be reduced. It is possible to secure a sufficient working space for the assembly inside the housing 40. Therefore, the workability of assembling work of the moving knife drive mechanism 30 can be improved.
In addition, the operator can visually recognize the inside of the housing 40 from the outside of the housing 40 through the opening 41a by removing the thrust receiver 39a. As a result, the moving knife drive mechanism 30 can be easily assembled as compared with the conventional sewing machine cloth cutting knife device in which the inside of the housing 40 cannot be visually recognized from the thrust direction, and the working efficiency can be improved. Figured.
Further, since the fixing screw 42a is provided as a fixing means and the thrust receiver 39a can be fixed to the opening 41, the opening 41 can be sized to allow the thrust receiver 39a to be inserted, and a larger opening. It is also possible to. Therefore, the visibility inside the housing 40 from the outside of the housing 40 can be further improved, and the moving knife drive mechanism 30 can be easily assembled.
Further, since the thrust receiver 39 a is a cylinder, the position can be easily adjusted from the outside of the housing 40.

In the present embodiment, only one thrust receiver 39a can be removed from one side of the housing 40 to the outside of the housing 40. However, the other thrust receiver 39b can be removed from the side of the housing 40 to the outside. It is good also as a structure. Moreover, it is also possible to make it the structure which can be removed from the both sides | surfaces of the housing 40 located in the axial direction of the link pin 35. FIG. In other words, the diameter of the front and rear ends of the link pin 35 and the diameter of the opening formed in the side wall of the housing are configured such that the diameter of the opening is large and the link pin can be removed from either the front or rear opening. Is also possible.
Further, in the present embodiment, an example is shown in which the present invention is applied to a right knife device that cuts the fabric on the right side of the sewing needle 4 in the cloth feeding direction, but the fabric is on the left side of the sewing needle 4 in the cloth feeding direction. Needless to say, the present invention can also be applied to a left female device that performs the above cutting.

It is a perspective view which shows the principal part structure of the cloth cutting knife apparatus of the sewing machine which concerns on this invention. It is a perspective view which shows the cloth cutting knife apparatus of the sewing machine which concerns on this invention. It is a perspective view which shows the moving knife drive mechanism in this invention. It is the schematic which shows the connection part of the link mechanism in this invention. It is explanatory drawing which shows the visibility in the housing in this invention.

Explanation of symbols

1 Cloth cutting knife device 2 Bed (sewing machine frame)
3 Needle plate 4 Sewing needle 10 Fixed knife 11, 21 Cutting edge 12 Fixed knife mounting base 20 Moving knife 22 Insertion hole 23 Screw 30 Moving knife drive mechanism 31 Moving knife drive shaft 32 Link mechanism 33 Coil spring 34 Drive arm (first link)
35, 37 Link pin 36 Link (second link)
39a, 39b Thrust receiver (receiving member)
40 Housing 41a, 41b Opening (fitting part)
42a, 42b Fixing screw H Needle hole (needle entry position)

Claims (2)

A fixed knife installed fixed near the needle entry position,
A moving knife provided so as to be able to cut the workpiece by swinging and slidingly contacting the fixed knife;
A moving knife drive shaft for swingably supporting the moving knife;
First and second links for imparting a rotational motion to the moving knife drive shaft;
A housing surrounding the first and second links and the moving knife drive shaft;
In a cloth cutting knife device for a sewing machine having a pair of receiving members slidably contacted from both axial sides of the connecting shaft of the first and second links,
The housing has fitting portions into which the pair of receiving members are fitted,
A sewing machine cloth characterized in that at least one fitting portion opens to the outside of the housing and one receiving member fitted to the opening fitting portion is detachable from the outside of the housing. Cutting knife device. A fixing means for fixing the receiving member to the opening;
The sewing machine cloth cutting knife device according to claim 1, wherein the opening is provided so that the receiving member can be inserted therethrough.

Images