JP2005192620A - Sewing machine cloth feed mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress pressing of a cloth by a cloth feed leg and a cloth presser foot.
SOLUTION: A cloth feed leg 30 for feeding a cloth, a cloth feed leg bar 48 for moving up and down while holding the feed leg at its lower end, a cloth presser foot 12 for pressing a cloth, and a cloth presser foot A cloth presser foot bar 49 that moves up and down, a swinging arm 44 that swings, and a swing driving force input from the swinging arm to one connecting portion 46c and the other two connections. And a bell crank member 46 for applying a vertical driving force to the cloth feed leg and the cloth presser foot almost alternately by the portions 46a and 46b, and for each of the cloth feed foot and the cloth presser foot to move downward. Stopping means 80 and 90 are provided for stopping in the middle of lowering and determining the lower position.
[Selection] Figure 7

Description

  The present invention relates to a cloth feed mechanism for a sewing machine in which a cloth feed foot and a cloth presser foot alternately move up and down.

  For example, in a conventional sewing machine, a cloth feed foot that feeds the cloth, a cloth feed foot bar that holds the feed leg at its lower end and is movable up and down with respect to the needle plate, and a cloth presser A cloth presser foot to be performed, a cloth presser foot provided with a cloth presser foot at the lower end thereof and movable up and down with respect to the needle plate, a swinging arm for swinging, and a first connecting portion A bell crank member that receives a swing driving force from the moving arm and applies a vertical driving force almost alternately to the cloth feed foot bar and the cloth presser foot bar respectively connected to the second and third connecting portions; A cloth feed mechanism including a pressure spring that urges each of the cloth feed foot bar and the cloth presser foot bar downward is mounted (for example, see Patent Document 1).

In the cloth feeding mechanism configured as described above, when the swing arm swings to one side and the swing driving force is input to the first connecting portion of the bell crank member, the link is located downstream in the swing direction. For example, the cloth feed foot bar connected to the second connecting part descends and comes into contact with the needle plate, and after the contact, the third connecting part side swings with the second connecting part as a fulcrum. , The fabric holding foot rises. The cloth feed leg is connected to the feed swing shaft, and swing driving force is input in the feed direction at the time of descending contact, and the cloth on the needle plate is fed by the swing.
When the swing arm swings to the other side and swing drive force is input to the first connecting portion of the bell crank member, the cloth connected to the third connecting portion located downstream in the swing direction The presser foot bar descends and abuts on the needle plate. After the abutment, the second coupling part side swings with the third coupling part as a fulcrum, and the cloth feed leg bar ascends. The cloth presser foot bar is substantially synchronized with the vertical movement of the needle bar, and presses and holds the cloth on the needle plate when the sewing needle is lowered.
JP 63-117790 A (Fig. 9)

However, in the conventional example, the fulcrum is determined by pressing either the cloth presser foot bar or the cloth feed foot bar against the cloth on the needle plate, and the cloth presser foot bar or the cloth feed foot is determined by the fulcrum. Since one of the bars is raised, the pressing pressure acts directly on the fabric. For this reason, there existed a problem that a fabric may produce a deformation | transformation and a damage by press.
In particular, in order to suppress jumping of the cloth feed mechanism, it is necessary to strengthen the spring pressure of each pressing spring. In such a case, the cloth is pressed more strongly, for example There is a higher possibility of deformation and damage, such as kinking of the tape caused by bias tape attachment in the process, and it is necessary to take measures to protect the fabric.
The object of the present invention is to protect the fabric and improve the quality of the sewn product.

  According to the first aspect of the present invention, there is provided a cloth feed foot that feeds the cloth, a cloth feed foot bar that holds the feed leg at its lower end and is movable up and down with respect to the needle plate, and a cloth that presses the cloth. A presser foot, a cloth presser foot provided at the lower end of the presser foot and provided so as to be movable up and down with respect to the needle plate, a swinging arm for swinging, and a swinging arm from one swinging part A bell crank member that receives a swing driving force and applies a vertical driving force almost alternately to the cloth feed foot bar and the cloth presser foot bar by the other two connecting portions, and the cloth feed foot and the cloth. For each presser foot, the lowering movement is stopped in the middle of lowering to provide a stopping means for determining the lower position.

In the above configuration, when the swing arm swings to one side and the swing driving force is input to the first connecting portion of the bell crank member, the connecting portion located on the downstream side in the swing direction, for example, The cloth feed leg connected to the second connecting part is lowered. At this time, the cloth feed leg bar is restrained from being lowered by the means for restraining the cloth feed leg bar at a preset lower position during the lowering operation.
Then, after stopping, the third connecting portion side swings with the second connecting portion as a fulcrum, and the cloth presser foot rises. At this time, the cloth feed leg performs the cloth feeding operation on the needle plate at the lower position. In this feeding operation, for example, similarly to the above-described conventional example, the cloth feeding foot bar may be swung to feed the cloth, or the cloth feeding foot is provided with a transporting means for transporting the fabric, You may feed cloth by the drive of the said conveyance means. Further, other known means may be used.

Further, when the swing arm swings to the other side and swing drive force is input to the first connecting portion of the bell crank member, the cloth connected to the third connecting portion located downstream in the swing direction The presser foot goes down. At this time, the cloth presser foot stick is restrained from being lowered by the restraining means of the cloth presser foot stick at a preset lower position during the lowering operation.
Then, after stopping, the second connecting part side swings with the third connecting part as a fulcrum, and the cloth feed leg rises. Thereby, the cloth presser foot holds the cloth in a state where it does not move on the needle plate. In such a state, for example, the sewing needle of the sewing machine causes the sewing thread to pass through the cloth.

The “lower position of the cloth feed leg” is the lowest position when the cloth feed leg is repeatedly moved up and down, and is determined by the stopping means of the cloth feed leg. It is desirable that the lower position is in contact with the fabric so that the fabric feed foot does not completely leave the fabric on the needle plate and does not interfere with the fabric feed operation.
Further, the “lower position of the cloth presser foot” is the lowest position when the cloth presser foot bar is repeatedly moved up and down, and is determined by the restraining means of the cloth presser foot bar. It is desirable that the lower position is in contact with the fabric so that the fabric presser foot is not completely separated from the fabric on the needle plate and the fabric does not cause a positional shift.

  The invention according to claim 2 has the same configuration as that of the invention according to claim 1, and the restraining means for the cloth feed foot projects into the guide body for guiding the vertical movement of the cloth feed foot bar and the cloth feed foot bar. The cloth presser foot restraining means has a guide body for guiding the vertical movement of the cloth presser foot bar and a stopper part provided in a state of protruding from the cloth presser foot bar. , Is adopted.

In the above configuration, the same operation as that of the first aspect of the invention is performed, the cloth feed leg is lowered while being guided by the guide body, and the stopper portion is in contact with the guide body during the lowering. The descent is stopped, and the stop position becomes the lower position of the cloth feed leg.
Similarly, the cloth presser foot bar is lowered while being guided by the guide body, and the lowering is stopped by the stopper part coming into contact with the guide body during the lowering, and the stop position is below the cloth presser foot. Position.

  The invention according to claim 3 has the same configuration as that of the invention according to claim 2, and each stopper portion is provided to be movable and adjustable along the vertical movement direction of each of the cloth feed foot and the cloth presser foot, For each of the cloth feed foot and the cloth presser foot, a lower position adjusting means for adjusting the lower position is provided, and the cloth feed foot lower position adjusting means is engaged with the main shaft portion and the fabric feed foot bar which are engaged with the stopper portion. And a feed adjusting shaft member having an eccentric shaft portion eccentric with respect to the main shaft portion, and the lower position adjusting means of the cloth presser foot engages with the main shaft portion engaging with the stopper portion and the cloth presser foot bar and the main shaft. The pressure adjusting shaft member provided with the eccentric shaft part eccentric with respect to the part is employed.

In the above configuration, when adjusting the lower position of the cloth feed leg, the feed adjusting shaft member is rotated around the main shaft portion. Since the eccentric shaft portion is eccentric with respect to the main shaft portion, the eccentric shaft portion rotates around the center line of the main shaft portion. The displacement in the predetermined radial direction due to the circular movement acts on the stopper portion with respect to the cloth feed foot bar, and the lower position is adjusted by the change in the position of the displacement.
Similarly, when adjusting the lower position of the cloth presser foot, the presser adjusting shaft member is rotated around the main shaft portion. Since the eccentric shaft portion is eccentric with respect to the main shaft portion, the eccentric shaft portion rotates around the center line of the main shaft portion. The displacement in the predetermined radial direction due to the circular movement acts on the stopper portion with respect to the cloth presser foot bar, and the lower position is adjusted by the change in the position of the displacement.

  The invention according to claim 4 has the same configuration as that of the invention according to claim 2, and each stopper portion is provided to be movable and adjustable along the vertical movement direction for each of the cloth feed foot and the cloth presser foot, Each of the cloth feed foot and the cloth presser foot is provided with a lower position adjusting means for adjusting the lower position. The cloth feed foot lower position adjusting means is rotatably held by the stopper portion or the cloth feed foot bar, A feed adjustment shaft member having a threaded portion that is screwed into the feed foot bar or the stopper portion is provided, and the lower position adjusting means of the cloth presser foot is rotatably held by the stopper portion or the cloth presser foot bar and A configuration is adopted in which a presser adjusting shaft member having a screw portion screwed to the foot bar or the stopper portion is provided.

In the above configuration, when adjusting the lower position of the cloth feed leg, the feed adjusting shaft member is rotated around the center line of the screw portion. Thereby, the structure which hold | maintains a feed adjustment shaft member and the structure currently screwed move relatively along the centerline of a screw part. Thereby, the lower position adjustment is performed by the position change of the movement.
Similarly, when adjusting the lower position of the cloth presser foot, the presser adjusting shaft member is rotated around the center line of the screw portion. Thereby, the structure which hold | maintains the holding | suppressing adjustment shaft member and the structure currently screwed move relatively along the centerline of a screw part. Thereby, the lower position adjustment is performed by the position change of the movement.
The feed adjusting shaft member may be rotatably held via a member that is interlocked with the stopper portion or the cloth feed leg, or may be screwed via a member that is interlocked with the cloth feed leg or the stopper portion. May be.
Similarly, the presser adjusting shaft member may be rotatably held via a member that is interlocked with the stopper portion or the cloth presser foot bar, or may be screwed via a member that is interlocked with the cloth presser foot bar or the stopper portion. May be combined.

  The invention according to claim 5 has the same configuration as that of the invention according to claim 3 or 4, and the cloth feed leg lower position adjusting means is supported by the feed adjusting shaft member so as to be able to contact and separate, and in the approaching direction. A feed adjustment knob that engages with the feed adjustment shaft member by moving and allows a rotation operation to be input to the feed adjustment shaft member; and a pressing spring that presses the feed adjustment knob in the separating direction. The lower position adjusting means is supported by the presser adjusting shaft member so as to be able to come into contact with and separated from the presser adjusting shaft member, and is engaged with the presser adjusting shaft member by moving in the approaching direction. A configuration is adopted in which a knob and a pressing spring that presses the pressing adjustment knob in the separating direction are provided.

In the above configuration, the same operation as that of the invention described in claim 3 or 4 is performed, and when the feed adjusting shaft member is rotated, in a normal state, it is separated from the feed adjusting shaft member by a pressing spring. The feed adjusting knob is pushed in to engage with the feed adjusting shaft member. In this state, the feed adjusting knob is rotated to input the rotational force to the feed adjusting shaft member. Thereby, the feed adjusting shaft member also rotates, and the position adjustment of the stopper portion and the lower position setting of the cloth feed leg are performed.
Similarly, during the rotation operation of the presser adjustment shaft member, in the normal state, the presser adjustment knob that is in a state of being separated from the presser adjustment shaft member by the pressing spring is pushed in by a pressing spring to engage with the presser adjustment shaft member. In this state, by rotating the presser adjustment knob, the rotational force is input to the presser adjustment shaft member. As a result, the presser adjustment shaft member also rotates, and the position adjustment of the stopper portion and the lower position setting of the cloth presser foot are performed.

Since the invention according to claim 1 is provided with restraining means for determining the respective lower positions of the cloth feed foot and the cloth presser foot, the pressing force that contacts the fabric when each of the cloth feed foot and the cloth presser foot is lowered. Can be appropriately reduced, and it becomes possible to appropriately avoid the deformation and damage of the fabric. For this reason, it becomes possible to protect the fabric and maintain the sewn product with high quality.
Furthermore, even if the spring pressure of the pressure spring of the cloth feed foot or cloth presser foot is strengthened to suppress jumping of the cloth feed mechanism, deformation and damage are avoided, and the fabric is effectively protected and sewn. The quality of the product can be improved.

In the invention according to claim 2, each stopping means of the cloth feed foot and the cloth presser foot is constituted by a guide body and a stopper portion, and the lower position of each of the cloth feed foot and the cloth presser foot is set by a simple configuration. It is possible to regulate and protect the fabric.
Further, when each guide body is used together with the support means for the cloth feed foot bar and the cloth presser foot bar, the configuration can be further simplified, and the productivity of the mechanism can be improved.

  The invention according to claim 3 is provided with a lower position adjusting means for each of the cloth feed foot and the cloth presser foot, and each lower position adjusting means is capable of adjusting the position of each stopper portion by rotating operation. Alternatively, since the presser adjusting shaft member is provided, the lower position adjustment of the cloth feed foot and the cloth presser foot can be performed only by rotating each adjusting shaft member, and the lower position setting operation can be performed quickly and easily. .

  According to a fourth aspect of the present invention, there is provided a lower position adjusting means for each of the cloth feed foot and the cloth presser foot, and each lower position adjusting means is capable of adjusting the position of each stopper portion by a rotating operation. Alternatively, since the presser adjusting shaft member is provided, the lower position adjustment of the cloth feed foot and the cloth presser foot can be performed only by rotating each adjusting shaft member, and the lower position setting operation can be performed quickly and easily. .

  According to a fifth aspect of the present invention, each of the lower position adjusting means is provided with an adjusting knob that is normally separated from each adjusting shaft member and can be adjusted only by being pushed in during adjustment work. For example, even when the adjustment shaft member is arranged in the frame of the sewing machine and cannot be operated from the outside of the frame, the adjustment knob can be operated from a remote position, and the adjustment shaft member and the adjustment shaft member are provided. The arrangement of the stopper portion and the like can be freely selected, and the degree of freedom in designing the mechanism can be expanded.

(Overall configuration of the embodiment)
An embodiment of the present invention will be described with reference to FIGS. This embodiment shows a cloth feed mechanism 100 mounted on a differential feed sewing machine 10. The differential feed sewing machine 10 is a sewing machine that performs sewing while performing squeezing by providing a difference in the respective feed speeds of the upper cloth and lower cloth to be sewn. For example, sewing of a sleeve and a body, etc. Used for.
It should be noted that the term “welding” means that a difference is provided in the sewing pitch width between the upper cloth and the lower cloth, and the sewing allowance can be made elastic by increasing the difference (wetting amount). Accordingly, when sewing the sleeve and the body, the shoulder side where the stretchability is required after the sewing can be given by making the shoulder side sewing allowance larger than the side side.
Here, the direction in which the sewing needle 11 described later moves up and down is defined as the Y-axis direction (vertical direction), and one direction orthogonal thereto is defined as the X-axis direction (front-rear direction), and both the Y-axis direction and the X-axis direction. The direction orthogonal to is defined as the Z-axis direction (left-right direction). Further, it is assumed that a mounting surface 15a described later is disposed in parallel to the XZ plane.

  Such a differential feed sewing machine 10 includes a needle plate 15 on which a placement surface 15a is formed for placing and sewing an upper cloth and a lower cloth, and a sewing needle 11 supported on the upper side of the placement face 15a so as to be movable up and down. A needle raising / lowering means 20 for driving the sewing needle 11 in the vertical direction, and a cloth feed mechanism for feeding the lower cloth and the upper cloth on the placement surface 15a of the needle plate 15 along the X-axis direction with individual pitch widths. 100.

(Needle plate)
The needle plate 15 is a plate-like member that is long in the cloth feeding direction. When the needle plate 15 is fixed below the sewing needle 11, a placement surface 15a that is a flat surface parallel to the XZ plane is provided in the middle in the longitudinal direction. Is formed. Further, the upstream side of the fabric feed direction from the placement surface 15a is formed with an upstream feed surface that sends the fabric slightly descending toward the upstream side, and the downstream side of the fabric feed direction from the placement surface 15a is A downstream feed surface is formed to feed the fabric with a slight downward gradient toward the downstream side.

(Sewing needle)
FIG. 2 is a perspective view showing a configuration located above the needle plate 15. The sewing needle 11 is reciprocated along the Y-axis direction by the needle lifting / lowering means 20 so as to pass through the upper cloth and the lower cloth on the placement surface 15a of the needle plate 15 and pass through the vicinity of the tip thereof. The thread is fed to the lower side of the throat plate 15 and engaged with the lower thread that the shuttle hook (not shown) engages to perform sewing.

(Needle lifting means)
The needle raising / lowering means 20 holds the sewing needle 11 at the lower end portion thereof, and is supported by a needle holding shaft 23 supported by an upper metal bearing 24 and a lower metal bearing 25 so as to reciprocate along the Y-axis direction, and a sewing machine motor (illustrated). And a main drive shaft 21 rotatably supported by a main body frame (not shown) in a state where the rotation center line is along the Z-axis direction, and is eccentric from the rotation center of the main drive shaft 21 An eccentric connecting rod 26 having one end connected to the position and the other end connected to the needle holding shaft 23 is provided.
The eccentric connecting rod 26 receives the rotational driving force of the main drive shaft 21 and performs a circumferential motion at one end portion along the XY plane, and only the driving force along the Y-axis direction is needled at the other end portion. This is transmitted to the holding shaft 23. As a result, the needle holding shaft 23 and the sewing needle 11 can reciprocate along the Y-axis direction (vertical direction).

(Overall configuration of cloth feed mechanism)
The cloth feed mechanism 100 is supported on the upper side of the placement surface 15a so as to be movable up and down, and is disposed adjacent to the cloth presser foot 12 to press the cloth when lowered, and on the placement surface 15a. An upper cloth feed leg 30 that feeds the upper cloth, a lower rotary feed section 70 that feeds the lower cloth on the placement surface 15a, and an upper feed driving means 60 that applies a driving force to the upper cloth feed leg 30 for feeding operation. Further, a lower feed driving means (not shown) for applying a driving force for the feeding operation to the lower rotation feeding portion 70 and a cloth presser foot 12 and an upper fabric feed foot 30 are alternately moved up and down in synchronization with the vertical movement of the sewing needle 11. And a vertical movement means 40 for vertically moving the cloth presser foot 12 together with the sewing needle 11.

(Cloth feed mechanism: Lower rotary feed part)
The lower side rotation feed part 70 is demonstrated based on FIG. FIG. 3 is an enlarged perspective view showing the configuration around the sewing needle 11. The lower rotational feed unit 70 is provided on the lower side of the needle plate 15 and above the hook (not shown), and the first and second lower belts conveyed to the lower feed driving means (not shown). 72, 73.

The belt guide 71 is formed with two guide grooves along the X-axis direction on the upper surface thereof, so that the sewing needle 11 is sent to the hook between the guide grooves and directly below the sewing needle 11. Through-holes are formed. Such a through hole is for performing sewing by inserting a lower thread fed by the hook into an annular part of an upper thread fed when the sewing needle 11 is inserted.
The lower belts 72 and 73 are conveyed along the guide grooves. At this time, the depth of the guide groove is set so that the upper surfaces of the lower belts 72 and 73 protrude upward from the placement surface 15 a of the needle plate 15. The first and second lower belts 72 and 73 are respectively provided corresponding to a first rotary feed portion 31 and a second rotary feed portion 32 of the upper cloth feed foot 30 described later. .
With this configuration, the lower cloth on the placement surface 15 a of the needle plate 15 contacts the upper surfaces of the first and second lower belts 72 and 73, and the lower cloth is moved along the X-axis direction by driving the belts 72 and 73. It is conveyed according to the belt conveyance speed. The lower feed drive seed means intermittently conveys the belts 72 and 73 at the timing when the sewing needle is pulled upward, avoiding the timing when the sewing needle 11 penetrates the lower cloth.

(Cloth feed mechanism: cloth presser foot)
As shown in FIG. 3, the overall shape of the presser foot 12 is substantially L-shaped, and the presser foot 49 of the vertical movement means 40, which will be described later, at the upper end of the portion corresponding to the L-shaped vertical bar. Is held in. Accordingly, the cloth presser foot 12 continuously moves up and down during sewing, and the upper cloth and the lower cloth are reciprocated every time when the lower surface of the portion corresponding to the L-shaped horizontal bar of the cloth presser foot 12 is in contact. Is pressed from above to the throat plate 15 side to press the cloth.

(Cloth feed mechanism: Upper cloth feed leg)
As shown in FIG. 3, the upper fabric feed foot 30 includes a first rotary feed portion 31 and a second rotary feed portion 32 provided side by side along the Z-axis direction with the fabric presser foot 12 interposed therebetween. And a connecting member 39 to be connected. Since the first and second rotary feed portions 31 and 32 are connected by the connecting member 39, they move integrally when the vertical movement means 40 performs the vertical movement.

The first rotary feed unit 31 is rotatable by a first upper belt 37 that is transported and driven by the upper feed drive means 60, a guide frame 33 that guides the first upper belt 37, and a tip portion of the guide frame 33. And a roller 35 that folds back the first upper belt 37.
The guide frame 33 is formed in a substantially J shape, and is held by the cloth feed leg bar 48 of the vertical movement mechanism 40 at its upper end. Then, the first upper belt 37 is folded back between a later-described upper feed motor 61a and the guide frame 33 via a roller 35 provided at the front end portion of the guide frame 33, and the bottom surface of the guide frame 33 is further moved along the X axis. It is stretched so as to pass along the direction. Thus, the conveyed first upper belt 37 can perform a feeding operation in the X-axis direction according to the conveyance speed with respect to the upper cloth positioned on the bottom surface side of the guide frame 33.

The second rotary feed section 32 is rotatable by a second upper belt 38 that is conveyed and driven by the upper feed drive means 60, a guide frame 34 that guides the second upper belt 38, and a tip end portion of the guide frame 34. A roller (not shown) that is supported and folds back the second upper belt 38 is provided.
The guide frame 34 is formed in a substantially J shape, and is held by the cloth feed leg 48 of the vertical movement mechanism 40 via the connecting member 39 and the guide frame 33 at the upper end portion thereof. Then, the second upper belt 38 is folded back via a roller provided at the tip of the guide frame 34 between an upper feed motor 61b (described later) and the guide frame 34, and the bottom surface of the guide frame 34 is further moved in the X-axis direction. It is stretched to pass along. Thereby, the second upper belt 38 to be transported can perform a feeding operation in the X-axis direction according to the transport speed with respect to the upper cloth positioned on the bottom surface side of the guide frame 34.

(Cloth feed mechanism: Top feed drive means)
The upper feed driving means 60 will be described with reference to FIGS. FIG. 4 is a view of the upper feed driving means 60 viewed from the Z-axis direction.
The upper feed driving means 60 includes a first upper feed motor 61a serving as a drive source for the feed operation of the first rotary feed portion 31 of the upper cloth feed leg 30, and a drive source for the feed operation of the second rotary feed portion 32. A second upper feed motor 61b, a motor bracket 62 which holds each upper feed motor 61a, 61b and is fixed to the main body frame, and an output shaft of the first upper feed motor 61a. A first pulley 63a provided with a belt groove around which the belt 37 is wound and an output shaft of the second upper feed motor 61b are provided, and a belt groove around which the second upper belt 38 is wound is provided. A second pulley 63b and a guide arm 64 having a plurality of pulleys for guiding the first and second upper belts 37 and 38 from the upper feed motors 61a and 61b to the upper cloth feed foot 30 are provided.

The first and second upper feed motors 61a and 61b are supported by the motor bracket 62 with their output shafts oriented in the Z-axis direction. Each of the upper feed motors 61a and 61b is a stepping motor capable of controlling the rotation angle amount.
The first upper belt 37 is wound around the first pulley 63a, and the second upper belt 38 is wound around the second pulley 63b. The upper feed motor 61a is individually provided for each belt 37, 38. And 61b are provided, it is possible to provide a difference in the amount of upper cloth feed between the first upper feed portion 31 and the second upper feed portion 32. Thereby, the followability with respect to the curved seam allowance can be enhanced, and the fabric can be sewn appropriately. Further, by making the upper feed portions 31 and 32 have the same feed amount, it is possible to easily cope with sewing in the straight direction.
The guide arm 64 is provided with tension pulleys everywhere in the longitudinal direction, and the first and second upper belts 37 and 38 are guided to the upper cloth feed leg 30 along the guide arm 64. The guide arm 64 is connected at its lower end to the upper cloth feed foot 30 that moves up and down, but in the middle of the guide arm 64, a rotation indirect is provided. The cloth feed leg 30 can be allowed to move up and down.

(Cloth feed mechanism: Vertical movement means)
The vertical movement means 40 will be described in detail with reference to FIGS. FIG. 5 is a perspective view of the vertical movement means 40 and the upper feed driving means 60.
The vertical movement means 40 is configured to support the upper fabric feed foot 30 so as to be movable in the vertical direction, to support the fabric presser foot 12 so as to be movable in the vertical direction, and to reciprocate the rotational driving force of the main drive shaft 21. Each of the structure for converting to a driving force for moving, the structure for alternately moving the upper cloth feed foot 30 and the cloth presser foot 12 up and down by the reciprocating swing driving force, and the upper cloth feed foot 30 and the cloth presser foot 12 respectively. Are provided with stopping means 80 and 90 for stopping the lowering movement in the middle of lowering and determining the lower position.

The upper cloth feed foot 30 is supported in such a manner that it can be moved up and down. The cloth feed foot bar 48 that holds the upper cloth feed foot 30 at its lower end and the body frame are fixed to the body frame. A first metal bearing 51 that is supported so as to be reciprocally movable along with a first pressing spring 55 that always presses the cloth feed leg 48 downward.
The structure for supporting the cloth presser foot 12 so as to be movable up and down includes a cloth presser foot bar 49 that holds the cloth presser foot 12 at its lower end and a body frame, and the fabric presser foot bar 49 is arranged along the vertical direction. It has a second metal bearing 52 that is supported so as to be able to reciprocate, and a second pressing spring 56 that always presses the cloth presser foot bar 49 downward via an X-axis displacement cancellation link body 47 described later.

  The structure for converting the rotational driving force of the main drive shaft 21 into a driving force for reciprocating swinging is rotatably supported by a motor bracket 62 (described later) fixedly mounted on the main body frame and swings along the Z-axis direction. One end of the shaft 41 is connected to one end of the swing shaft 41, the main drive swing link body 42 swinging around the swing shaft 41, and one end of the main drive shaft 21. In addition, the other end portion has an eccentric connecting rod 43 connected to the swing end portion of the main swing link body 42.

  The eccentric connecting rod 43 has an eccentric wheel that is rotatable at one end thereof, and is fixedly supported on the main drive shaft 21 at a position where the eccentric wheel is eccentric from the center thereof. Accordingly, since the eccentric wheel rotates together in an eccentric state by the rotational drive of the main drive shaft 21, one end of the eccentric connecting rod 43 performs a circular motion centering on the main drive shaft 21 and having an eccentric distance as a radius. On the other hand, the eccentric connecting rod 43 is connected to the swing end portion of the main swing link body 42 with the other end portion being rotatable about the Z-axis direction. As a result, if one end of the eccentric connecting rod 43 moves away from the main swing link 42, the swing end of the main swing link 42 is pulled in its own direction, and one end of the eccentric connecting rod 43 is the main end. If it moves to a position approaching the dynamic swing link body 42, the swing end portion of the main swing link body 42 is pushed back in the direction away from its own position. Therefore, the main swing link body 42 performs a reciprocating swing operation around the swing shaft 41. At this time, the swing shaft 41 also performs reciprocating swinging rotation within the same angle range as the swing range of the main swing link body 42.

  Further, the main swing link 42 is formed with a long hole at the swing end. The other end of the eccentric connecting rod 43 is connected to the elongated hole at a predetermined position of the elongated hole so as to be rotatable about the Z-axis direction. This is because by changing and adjusting the connecting position of the connecting rod 43 along the elongated hole, the swing radius of the main swing link 42 is changed, and thereby the swing angle is changed and adjusted. In other words, by making it possible to change and adjust the connection position of the main swing link body 42 having a long hole and the other end of the eccentric connecting rod 43 along the long hole, the cloth presser foot 12 and the upper cloth feed foot 30 constitutes an overall vertical stroke adjusting means.

  The configuration in which the upper fabric feed foot 30 and the fabric presser foot 12 are alternately moved up and down by the reciprocating swing driving force has a connection point at each vertex of the triangle and the first and second connection points therein. The swinging shaft 41 is fixedly connected to the bell crank member 46 for applying a vertical driving force to the cloth feeding foot bar 48 and the cloth pressing foot bar 49 by the respective 46a and 46b, and the other end portion of the swinging shaft 41 described above. And a transmission link body 45 for connecting the swinging end of the swinging arm 44 and the third connecting point 46c of the bell crank member 46. Yes.

The first connecting point 46a of the bell crank member 46 is connected to the cloth feed leg bar 48 via a cloth feed leg bar holding member 82 as a stopper portion of an upper cloth feed leg restraining means 80 described later, The second connection point 46b is connected to the cloth presser foot stick 49 via the X-axis displacement canceling link body 47 and a cloth presser foot bar holding member 92 as a stopper portion of a cloth presser foot restraining means 90 described later. .
Only the swing arm 44 and the swing shaft 41 are fixedly connected, and the other connection points of the swing arm 44, the link bodies 45 and 47, and the bell crank member 46 are all centered in the Z-axis direction. Are connected so as to be rotatable.

Further, the upper cloth feed leg restraining means 80 includes a guide body 81 slidably contacting the cloth feed leg bar 48 on the upper side of the first metal bearing 51 and allowing the vertical movement thereof, and a sliding surface of the cloth feed leg bar 48. And a cloth feed leg stick holding member 82 as a stopper portion mounted in a protruding state, and a lower position adjusting means 83 (see FIG. 6) for adjusting the lower position of the upper cloth feed leg 30.
Similar to the first metal bearing 51, the guide body 81 is fixed and held on the main body frame and is formed in a cylindrical shape. The cloth feed leg bar 48 is inserted into the inner side of the cloth feed leg bar 48 so as to be slidable in the vertical direction.

The cloth feed leg stick holding member 82 is mounted on the cloth feed leg stick 48 inserted in the guide body 81 above the guide body 81. The cloth feed leg stick holding member 82 includes an insertion portion for the cloth feed leg stick 48 and a fastening screw 82a (see FIG. 6A) for fastening the inserted cloth feed leg stick 48. The cloth feed leg holding member 82 can be fixed at an arbitrary position on the feed leg 48.
Further, as described above, the cloth feed leg stick holding member 82 is connected to the first connecting portion 46 a of the bell crank member 46.
Accordingly, when the cloth feed leg bar holding member 82 is fixed to the cloth feed leg bar 48, the vertical movement driving force is transmitted from the bell crank member 46 to the cloth feed leg bar 48. Further, at the position where the lower part of the cloth feed leg stick holding member 82 comes into contact with the upper part of the guide body 81, further lowering of the cloth feed leg stick 48 and the upper cloth feed leg 30 is stopped, and the stop position is set to the upper cloth feed leg. It has a function of determining the lower position of the foot 30.
The lower position adjusting means 83 of the upper cloth feed foot 30 has substantially the same configuration as the lower position adjusting means 93 of the cloth presser foot 12 provided in the cloth presser foot restraining means 90 described later. The details will be described later at the same time as the means 93.

The restraining means 90 for the cloth presser foot protrudes on the sliding contact surface of the cloth presser foot bar 49 and the guide body 91 that slides on the cloth presser foot bar 49 and allows the vertical movement thereof on the upper side of the second metal bearing 52. A cloth presser foot stick holding member 92 as a stopper portion mounted in a state and a lower position adjusting means 93 (see FIG. 6) for adjusting the lower position of the cloth presser foot 12 are provided.
Similar to the second metal bearing 52, the guide body 91 is fixed and held on the main body frame and is formed in a cylindrical shape. A cloth presser foot bar 49 is inserted into the inner side, and the cloth presser foot bar 49 is supported so as to be slidable in the vertical direction.

The cloth presser foot stick holding member 92 is mounted on the cloth presser foot stick 49 inserted in the guide body 91 above the guide body 91. The cloth feed leg stick holding member 92 includes an insertion portion for the cloth presser foot stick 49 and a fastening screw 92a (see FIG. 6A) for fastening the inserted cloth presser foot stick 49. The cloth feed leg bar holding member 92 can be fixed at an arbitrary position on the presser leg bar 49.
Further, as described above, the cloth presser foot stick holding member 92 is connected to the second connecting portion 46 b of the bell crank member 46.
Accordingly, when the cloth presser foot holding member 92 is fixed to the cloth presser foot stick 49, the vertical movement driving force is transmitted from the bell crank member 46 to the cloth presser foot stick 49. Further, at the position where the lower part of the cloth presser foot holding member 92 is in contact with the upper part of the guide body 91, further lowering of the cloth presser foot stick 49 and the cloth presser foot 12 is stopped, and the stop position is set to the cloth presser foot 12. Has a function of determining the lower position.

6A is an exploded perspective view of the lower position adjusting means 83 (93), and FIG. 6B is a cross-sectional view of the lower position adjusting means 83 (93) along a cross section along the vertical direction. Since the lower position adjusting means 83 of the upper cloth feed foot and the lower position adjusting means 93 of the cloth presser foot adopt the same configuration, the configuration of the lower position adjusting means 83 of the upper cloth feed foot corresponds in parentheses. The reference numeral of the structure of the lower position adjusting means 93 of the cloth presser foot is attached and will be described at the same time.
The lower position adjusting means 83 (93) includes a main shaft portion 84a (94a) that engages with the cloth feeding foot bar holding member 82 (cloth holding foot bar holding member 92) and a cloth feeding foot bar 48 (cloth holding foot bar 49). A feed eccentric pin 84 (pressing eccentric pin 94) as a feed adjusting shaft member (pressing adjusting shaft member) including an eccentric shaft portion 84b (94b) that is engaged with the main shaft portion 84a and eccentric with respect to the main shaft portion 84a (94a); The feed eccentric pin 84 (pressing eccentric pin 94) is supported so as to be able to come into contact with and separated from the feed eccentric pin 84 and moves in the approaching direction to engage with the feed eccentric pin 84 (pressing eccentric pin 94). ) And a pressing spring 86 (96) for pressing the feeding adjusting knob 85 (pressing adjustment knob 95) in the separating direction. Eteiru.

The cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) has a through hole 82b (92b) into which the main shaft portion 84a (94a) of the feed eccentric pin 84 (press eccentric pin 94) can be inserted. It is formed from the outside to the insertion portion of the cloth feed foot bar 48 (cloth holding foot bar 49).
The cloth feed leg stick 48 is located on the outer peripheral surface of the cloth feed leg stick 48 (cloth presser leg stick 49) at a position where the cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) is attached. A long hole 48a (49a) having a width in the longitudinal direction of 48 (cloth holding foot rod 49) is formed.

On the other hand, the main shaft portion 84a (94a) of the feed eccentric pin 84 (pressing eccentric pin 94) is set to have a larger diameter than the eccentric shaft portion 84b (94b), and the feed eccentricity with respect to the main shaft portion 84a (94a). An eccentric shaft portion 84b (94b) is integrally provided on the distal end side in the insertion direction of the pin 84 (pressing eccentric pin 94).
Further, the main shaft portion 84a (94a) and the eccentric shaft portion 84b (94b) are set so that their center line directions are parallel to each other and their center lines are eccentric. Therefore, when the rotation operation is applied to the main shaft portion 84a (94a), the eccentric shaft portion 84b (94b) moves around. The eccentric shaft portion 84b (94b) has a diameter approximately equal to the width in the direction perpendicular to the longitudinal direction of the long hole 48a (49a) formed in the cloth feed foot rod 48 (cloth holding foot rod 49) described above. It is set to a size that matches and can be inserted.

  Then, when the cloth feed foot bar holding member 82 (cloth holding foot bar holding member 92) is attached to the cloth feed foot bar 48 (cloth holding foot bar 49) and the fastening screw 82a (92a) is not tightened, the above-mentioned feed The eccentric pin 84 (pressing eccentric pin 94) is inserted with the eccentric shaft portion 84b (94b) facing the distal end, and the eccentric shaft portion 84b (94b) is also inserted into the elongated hole 48a (49a). As a result, when a rotation operation is applied to the main shaft portion 84a (94a), the eccentric shaft portion 84b (94b) moves around, so that the cloth feed foot bar holding member 82 (cloth holding foot bar holding member 92) is moved to the cloth feed foot. The position can be adjusted by moving the bar 48 (cloth holding foot bar 49) up and down.

Further, the feed eccentric pin 84 (pressing eccentric pin 94) has a slit 84c (94c) for engagement with the feed adjusting knob 85 (pressing adjusting knob 95) at the end opposite to the insertion direction. ing.
The feed adjustment knob 85 (pressing adjustment knob 95) is for engaging the shaft portion 85a (95a), a head portion 85b (95b) formed at one end thereof, and a slit portion 84c (94c) formed at the other end portion. Claws 85c (95c).
The head portion 85b (95b) is set to have a larger diameter than the shaft portion 85a (95a), and the head 85b (95b) is manually rotated. On the other hand, the engaging claw portion 85c (95c) can be inserted into the slit portion 84c (94c) of the feed eccentric pin 84 (pressing eccentric pin 94). An input of the rotation operation can be applied to the feed eccentric pin 84 (pressing eccentric pin 94).

The feed adjustment knob 85 (pressing adjustment knob 95) has an engaging claw portion 85c (95c) in the through hole 17 provided in the outer case of the differential feed sewing machine 10 having substantially the same diameter as the shaft portion 85a (95a). Inserted from the side. At the time of such insertion, the shaft portion 85a (95a) is inserted in advance into the pressing spring 86 (96) having a smaller diameter than the head portion 85b (95b), and the outer wall surface of the outer case and the head portion 85b (95b). With the pressing spring 86 (96) interposed therebetween in a compressed state, an E-ring 87 (97) for preventing removal is attached to the tip of the shaft portion 85a (95a) inside the outer case.
Accordingly, the head 85b (95b) of the feed adjustment knob 85 (pressing adjustment knob 95) is pressed by the pressing spring 86 (96), and the engaging claw portion 85c (95c) is fed by the feed eccentric pin 84 (pressing eccentricity). In a state of being separated from the pin 94), the E-ring 87 (97) protrudes to the outside of the outer case to the extent that it does not fall off.

When adjusting the lower position, the feed adjustment knob 85 (press adjustment knob 95) is pushed in, and the claw portion 85c (95c) for engagement is inserted into the slit portion 84c (94c) while maintaining the head 85b. (95b) is rotated, and the feed eccentric pin 84 (pressing eccentric pin 94) is rotated. Thus, the vertical position of the cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) with respect to the cloth feed leg stick 48 (cloth presser leg stick 49) is appropriately adjusted.
Then, by adjusting the vertical position of the cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) with respect to the cloth feed leg stick 48 (cloth presser leg stick 49), the upper cloth feed leg 30 (cloth presser leg). 12) The lower position (stop position) is adjusted.

(Description of differential feed sewing machine operation)
Regarding the operation of the differential feed sewing machine having the above-described configuration, the operation of the cloth feed mechanism 100 will be mainly described. 7 and 8 are explanatory views of the operation of the cloth feed mechanism 100. FIG.
When the main drive shaft 21 is rotationally driven by the sewing machine motor, the needle raising / lowering means 20 moves the sewing needle 11 up and down according to the rotational speed of the main drive shaft. On the other hand, the rotational driving force of the main drive shaft 21 is converted into a swing operation having the same period as the vertical movement of the sewing needle 11 via the eccentric connecting rod 43 and the main swing link body 42, and the swing arm 44 swings. Perform dynamic movement.

FIG. 7 described above shows a state where the swing arm 44 swings counterclockwise about the swing shaft 41, and FIG. 8 shows a state where the swing arm 44 swings clockwise. As shown in FIG. 7, when the swing arm 44 swings counterclockwise, the driving force is input to the third connection point 46 c of the bell crank member 46 via the transmission link body 45. In the bell crank member 46, when the swing driving force is input to the third connection point 46c, the whole is rotated around the first connection point 46a, and the second connection point 46b is lowered. As a result, a downward movement is imparted to the cloth presser foot bar 49 via the X-axis displacement cancellation link body 47 and the cloth presser foot bar holding member 92.
Since the cloth presser foot 49 is supported by the second metal bearing 52, it can move only along the Y-axis direction. However, the second connection point 46b is connected to the Y-axis direction and the X-axis direction. Displacement occurs in both. Therefore, the X-axis displacement cancellation link body 47 rotates to allow the displacement in the X-axis direction and transmit only the displacement in the Y-axis direction. The X-axis displacement cancellation link body 47 may be provided between the first connection point 46 a of the bell crank member 46 and the cloth feed leg stick holding member 82.

Then, when the cloth presser foot bar 49 is lowered, the lower surface of the cloth presser foot bar holding member 92 is brought into contact with the upper surface of the guide body 91 according to the position set in advance by the lower position adjusting means 93, and is further lowered. Operation is restricted. That is, the cloth presser foot 12 stops at a lower position having a predetermined height corresponding to the cloth thickness, and further lowering is restricted.
Thereby, in the bell crank 46, it switches to rocking | fluctuation centering on the 2nd connection point 46b, and the 1st connection point 46a raises. As a result, the upward movement is imparted to the upper cloth feed leg 30 via the cloth feed leg holding member 82 and the cloth feed leg 48.

Next, as shown in FIG. 8, when the swing arm 44 swings clockwise, the driving force is input to the third connection point 46 c of the bell crank member 46 via the transmission link body 45. In the bell crank member 46, when the swing driving force is input to the third connection point 46c, the whole is rotated around the second connection point 46b, and the first connection point 46b is lowered. As a result, the lowering operation is applied to the cloth feed leg bar 48 via the cloth feed leg bar holding member 82.
Since the cloth feed leg 48 is supported by the first metal bearing 51, it can move only along the Y-axis direction. In this case, however, the first connecting point 46a in the X-axis direction can be moved. The displacement is eliminated by the X-axis displacement elimination link body 47 described above moving the second connecting portion 46b in the X-axis direction.

Then, when the cloth feed leg bar 49 is lowered, the lower surface of the cloth feed leg bar holding member 82 is brought into contact with the upper surface of the guide body 81 according to the position set in advance by the lower position adjusting means 83, and further descends. Operation is restricted. That is, the upper cloth feed foot 30 stops at a lower position that is a predetermined height corresponding to the cloth thickness, and further lowering is restricted.
Thereby, in the bell crank 46, it switches to the rocking | swiveling centering on the 1st connection point 46a, and the 2nd connection point 46b raises. Thereby, the raising operation is given to the cloth presser foot 12 via the X-axis displacement canceling link body 47, the cloth presser foot bar holding member 92 and the cloth presser foot bar 49.

  As a result, the cloth presser foot 12 and the upper cloth feed foot 30 alternately move up and down, and the cloth presser foot 12 is substantially synchronized with the vertical movement of the sewing needle, so that the sewing needle 11 is on the needle plate 15. When the upper cloth and the lower cloth are inserted, cloth pressing is performed. Further, the upper cloth feed foot 30 descends at the timing when the sewing needle 11 is above the cloth, and the cow other cloth and the upper cloth are fed by the respective feed amounts in cooperation with the lower rotation feed section 70.

(Effect of embodiment)
The cloth feed mechanism 100 of the differential feed sewing machine 10 is provided with restraining means 80 and 90 for determining the lower positions of the upper cloth feed leg 30 and the cloth presser foot 12, respectively. At the time of each descent of the twelve, it can be set so as to appropriately reduce the pressing force in contact with the fabric, and it becomes possible to appropriately avoid the deformation and damage of the fabric. For this reason, it becomes possible to protect the fabric and maintain the sewn product with high quality.
Moreover, it is possible to select an appropriate pressing force for various different thicknesses of fabric, and from this viewpoint, it is possible to protect the fabric and maintain the sewing product with high quality.

Furthermore, in the cloth feed mechanism 100, the restraining means 80 (90) of the upper cloth feed foot 30 (cloth presser foot 12) includes a guide body 81 (91) and a cloth feed foot bar holding member 82 (cloth presser foot bar holding member 92). With a simple configuration, it is possible to define the lower position of each of the cloth upper feed leg 30 and the cloth presser foot 12 and protect the fabric.
In the cloth feed mechanism 100 described above, the first metal bearing 51 (second metal bearing 52) and the guide body 81 (91) are formed as separate bodies, but these can be formed as one member. It is. In other words, the configuration can be further simplified, and the productivity of the cloth feed mechanism 100 can be improved.

In the cloth feed mechanism 100, a lower position adjusting means 83 (93) is provided for the upper cloth feed leg 30 (cloth presser foot 12), and the position can be adjusted by rotating the feed eccentric pin 84 (presser eccentric pin 94). Therefore, the lower position adjustment of the upper cloth feed foot 30 (cloth presser foot 12) can be performed quickly and easily.
Furthermore, since the lower position adjusting means 83 (93) includes an adjusting knob 85 (95) that can be adjusted only by pushing it in during adjustment work, for example, the eccentric pin 84 (94) is disposed in the frame of the sewing machine. Even if the arrangement is such that it cannot be operated from outside the frame, the adjustment knob 85 (95) can be operated from a remote position, and the eccentric pin 84 (94) and the cloth feed leg holding member on which the eccentric pin 84 (94) is provided. It is possible to freely select the arrangement of 82 (cloth holding foot stick holding member 92) and the like, and to increase the degree of freedom in designing the mechanism.

(Other examples of lower position adjusting means)
The lower position adjusting means 83 (93) is not limited to the above configuration. For example, the lower position adjusting means 83 </ b> A of the upper cloth feed foot having the configuration shown in FIG. 9 may be mounted on the cloth feed mechanism 100. Since the same configuration may be adopted for the lower position adjusting means of the cloth presser foot, the structure number of the lower position adjusting means 83A of the upper cloth feed foot is attached with the reference numeral corresponding to the structure written in parentheses, It will be explained at the same time.

  The lower position adjusting means 83A (93A) includes a screw shaft 84A (94A) as a feed adjusting shaft member (pressing adjusting shaft member) that engages with the cloth feeding foot rod holding member 82 (cloth holding foot rod holding member 92). A cylindrical body 87A (97A) that rotatably supports the screw shaft 84A (94A), and a screw shaft 84A (94A) that is supported so as to be able to contact and separate from the screw shaft 84A (94A) and moves in the approaching direction. A feed adjustment knob 85A (pressing adjustment knob 95A) that engages with the screw shaft 84 (94A) and allows the rotation operation to be input, and a pressing spring that presses the feed adjustment knob 85A (pressing adjustment knob 95A) in the separating direction. 86 (96).

A screw hole 48a (49a) parallel to the longitudinal direction is formed in the upper end portion of the cloth feed foot bar 48 (cloth holding foot bar 49). The above-described screw shaft 84A (94A) has a male screw formed at one end thereof and an engagement groove with the feed adjustment knob 85A (press adjustment knob 95A) at the other end.
One end portion of the screw shaft 84A (94A) is screwed into the screw hole 48a (49a) of the cloth feed foot rod 48 (cloth holding foot rod 49), and the other end portion thereof is a cylindrical body 87A (97A). ) Is supported to be rotatable inside.

Cylindrical body 87A (97A) has both ends opened, and a partition is provided in the middle in the longitudinal direction. The screw shaft 84A (94A) is rotatably supported by a through hole provided in the partition wall and is held so as not to move in the center line direction.
The cylindrical body 87A (97A) is fixedly connected to the cloth feed leg stick hugging member 82 (cloth pressing leg stick hugging member 92) at the opened one end side, and the cloth feed leg stick hugging member 82 ( The upper end portion of the cloth feeding foot rod 48 (cloth pressing foot rod 49) inserted through the cloth pressing foot rod holding member 92) is inserted to the inside thereof. Thereby, the cloth feed foot bar 48 (cloth holding foot bar 49) is connected to the screw shaft 84A (94A).
Accordingly, when a rotation operation is applied to the screw shaft 84A (94A), the cloth feed foot bar 48 (cloth presser foot bar 49) becomes the cylindrical body 87A (97A) and the cloth feed foot bar hanger member 82 (cloth presser foot bar hug member). 92), the lower position of the upper cloth feed foot 30 (cloth presser foot 12) can be adjusted.
Further, the first pressing spring 55 (second pressing spring 56) is inserted into the other end of the cylindrical body 87A (97A) that is opened, and the cylindrical body 87A (97A) and the cloth feed leg stick hug. Through the member 82 (cloth holding foot stick holding member 92), the cloth feeding foot stick holding member 82 (cloth holding foot stick holding member 92) is always pressed downward.

The feed adjustment knob 85A (pressing adjustment knob 95A) has a large-diameter head at one end, and a wedge-shaped protrusion that engages with the engagement groove of the screw shaft 84A (94A) at the other end. Is formed.
The feed adjustment knob 85A (pressing adjustment knob 95A) is an outer case of the differential feed sewing machine 10 and is a penetrating hole provided at a position directly above the cloth feeding foot bar holding member 82 (cloth holding foot bar holding member 92). The hole 18 is inserted from the protruding portion side. At the time of such insertion, the pressure spring 86A (96A) having a smaller diameter than the head is inserted in advance, and the pressure spring 86A (96A) is interposed between the outer wall surface of the outer case and the head in a compressed state. An E-ring (not shown) for preventing removal is attached inside the outer case.
As a result, the feed adjustment knob 85A (pressing adjustment knob 95A) has its head pressed against the pressing spring 86A (96A), and the protruding portion is separated from the feed screw shaft 87A (97A) by the E-ring. It will be in the state which protruded outside the outer case to such an extent.

When the lower position is adjusted, the feed adjustment knob 85A (pressing adjustment knob 95A) is pushed downward, and the protruding portion is inserted into the engagement groove of the screw shaft 84A (94A), while maintaining the state of the head. A rotation operation is applied to rotate the screw shaft 84A (94A). Thus, the vertical position of the cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) with respect to the cloth feed leg stick 48 (cloth presser leg stick 49) is appropriately adjusted.
Then, by adjusting the vertical position of the cloth feed leg stick holding member 82 (cloth presser leg stick holding member 92) with respect to the cloth feed leg stick 48 (cloth presser leg stick 49), the upper cloth feed leg 30 (cloth presser leg). 12) The lower position (stop position) is adjusted.
Thus, even with the above configuration, it is possible to function in the same manner as the above-described lower position adjusting means 83 (93).

It is a perspective view which shows the schematic structure of the whole differential feed sewing machine. It is an expansion perspective view of the principal part of the cloth feeding mechanism disclosed in FIG. It is an expansion perspective view which shows the surrounding structure of a sewing needle. It is the figure which looked at the upper feed drive means from the Z-axis direction. It is a perspective view of a vertical movement means and an upper feed drive means. 6A is an exploded perspective view of the lower position adjusting means, and FIG. 6B is a cross-sectional view of the lower position adjusting means by a cross section along the vertical direction. It is operation | movement explanatory drawing of a cloth feed mechanism which shows the state which the rocking | swiveling arm rock | fluctuated counterclockwise centering on the rocking | fluctuation axis | shaft. It is operation | movement explanatory drawing of a cloth feed mechanism which shows the state which the rocking | swiveling arm rock | fluctuated clockwise centering on the rocking | fluctuation axis | shaft. It is sectional drawing which shows the other example of a lower position adjustment means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Differential feed sewing machine 11 Sewing needle 15 Needle plate 12 Cloth presser foot 30 Upper cloth feed foot 40 Vertical movement means 44 Swing arm 46 Bell crank member 46a First connection point 46b Second connection point 46c Third connection point 48 Cloth feed foot bar 49 Cloth presser foot bar 51 First metal bearing 52 Second metal bearing 80 Upper cloth feed foot restraining means 81 Guide body 82 Cloth feed foot bar holding member (stopper part)
83 Lower position adjusting means 84 Feed eccentric pin (adjustment shaft member)
85 Feed adjusting knob 86 Pressing spring 90 Cloth holding foot restraining means 91 Guide body 92 Cloth holding foot bar holding member 93 Lower position adjusting means 94 Holding eccentric pin (adjustment shaft member)
95 Pressing adjustment knob 96 Pressing spring 100 Cloth feed mechanism

Claims (5)

A cloth feed foot for performing cloth feed,
A cloth feed foot bar that holds the feed foot at its lower end and is movable up and down with respect to the needle plate;
A cloth presser foot for holding the cloth,
The cloth presser foot provided with the cloth presser foot at the lower end portion thereof and capable of moving up and down with respect to the needle plate,
A swing arm that swings;
A bell crank member in which a swing driving force is input to the one connecting portion from the swing arm and a vertical driving force is applied almost alternately to the cloth feed foot bar and the cloth presser foot bar by the other two connecting portions. And
A cloth feed mechanism for a sewing machine, comprising a restraining means for restraining the lowering movement of each of the cloth feed foot and the cloth presser foot in the middle of lowering and determining a lower position. The cloth feed leg restraining means has a guide body for guiding the vertical movement of the cloth feed leg, and a stopper portion provided in a state protruding from the cloth feed leg.
2. The cloth presser foot restraining means includes a guide body that guides the vertical movement of the cloth presser foot bar, and a stopper provided in a state of protruding from the cloth presser foot bar. Sewing machine cloth feed mechanism. For each of the cloth feed foot and the cloth presser foot, the stopper portions are provided so as to be movable and adjustable along the vertical movement direction.
For each of the cloth feed foot and the cloth presser foot, a lower position adjusting means for adjusting the lower position is provided,
The cloth feed foot lower position adjusting means includes a feed adjusting shaft member including a main shaft portion that engages with the stopper portion and an eccentric shaft portion that is engaged with the cloth feed foot bar and eccentric with respect to the main shaft portion. Prepared,
The cloth presser foot lower position adjusting means includes a presser adjusting shaft member including a main shaft portion that engages with the stopper portion and an eccentric shaft portion that is engaged with the cloth presser foot bar and is eccentric with respect to the main shaft portion. The cloth feed mechanism for a sewing machine according to claim 2, further comprising: For each of the cloth feed foot and the cloth presser foot, the stopper portions are provided so as to be movable and adjustable along the vertical movement direction.
For each of the cloth feed foot and the cloth presser foot, a lower position adjusting means for adjusting the lower position is provided,
The cloth feed leg lower position adjusting means is rotatably held by the stopper part or the cloth feed leg bar, and has a screw part screwed into the cloth feed leg bar or the stopper part. With
The lower position adjusting means of the cloth presser foot is rotatably held by the stopper part or the cloth presser foot bar, and a presser adjusting shaft member provided with a screw part screwed into the cloth presser foot bar or the stopper part. The cloth feed mechanism for a sewing machine according to claim 2, further comprising: The cloth feed leg lower position adjusting means is supported by the feed adjusting shaft member so as to be able to come into contact with and separated from the feed adjusting shaft member, and is moved in the approaching direction to engage with the feed adjusting shaft member to rotate the feed adjusting shaft member. A feed adjustment knob that enables input, and a pressing spring that presses the feed adjustment knob in the separating direction;
The cloth presser foot lower position adjusting means is supported by the presser adjusting shaft member so as to be able to come into contact with and separated from the presser foot and engages with the presser adjusting shaft member by moving in an approaching direction. 5. The sewing machine cloth feed mechanism according to claim 3, further comprising: a presser adjustment knob that can input the presser and a pressing spring that presses the presser adjustment knob in the separating direction.

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