JPH0513367U - Differential feed sewing machine differential amount setting device - Google Patents

Abstract

(57) [Summary] [Purpose] An operator can adjust the initial value and the changed value of the differential amount while keeping his or her hand at a certain position, and the operability does not cause the set value to shift carelessly. An object of the present invention is to provide a differential amount setting device for a differential feed sewing machine which is excellent in operation. According to the present invention, a knob 26 for setting an initial value and a knob 22 for setting a changed value are provided at one end of an inner shaft 25 and an outer shaft 21 having a double shaft structure, and an initial value is set for each shaft. The stopper 29 for adjusting and the stopper 28 for setting the changed value are screwed together so that the respective stoppers advance and retreat by the respective knobs, while being fixed to the feed amount changing shaft 30 which determines the differential amount by the rotational position. The differential adjustment arm 32 is always urged to come into contact with the initial value setting stopper, and when the initial value is set, the wire 39 is released to bring the differential adjustment arm into contact with the initial value setting stopper. Then, when the change value is set, the wire is pulled so that the differential adjustment arm is brought into direct or indirect contact with the change value setting stopper.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an operation amount setting device for setting the difference between the front and rear feed amounts of a cloth placed on a needle plate in an operation feed sewing machine that performs pleat stitching or stretch stitching.

[0002]

[Prior Art]

 Generally, an operation feed sewing machine is provided with a main feed mechanism consisting of feed teeth and the like and a sub feed mechanism in the front and rear along the cloth feed direction. By making the size of the mechanism different from that of the mechanism, pleats or stretch stitches are performed. That is, in a sewing machine in which the cloth feed amount by the sub feed mechanism is larger than that by the main feed mechanism, the sewing operation is performed while forming the folds on the flat cloth, and conversely the feed amount by the sub feed mechanism is increased. With a sewing machine that is smaller than the main feed mechanism, the sewing operation is performed while stretching the cloth back and forth.

In addition, in any of the above sewing forms (pleat stitching, stretch stitching), the difference in the cloth feed amount between the main feeding mechanism and the sub feeding mechanism (actuation amount) may need to be changed. That is, in the pleats, the size of the pleats may have to be made larger or smaller than the initial size, and in the sewn stitches, the amount of stretch of the cloth may have to be increased or caused. In such a case, the working amount is changed by adjusting the rotational position of the feed amount adjusting shaft that is linked to the sub-feed mechanism, but when the working amount needs to be changed during one sewing operation. Therefore, it is necessary to instantaneously adjust the rotational position of the feed amount changing shaft. Therefore, conventionally, an operation amount setting device as shown in FIG. 5 has been proposed.

In the figure, reference numeral 1 is an operation adjusting table, which is fixed in a sewing machine arm M (not shown), and shaft screws 2 are rotatably supported at both ends thereof. One end of the shaft screw 2 projects from the front surface of the sewing machine arm, and the knob 3 is fixed to this projecting portion. A stopper 4 is screwed into the threaded portion 2a of the shaft screw 2, and its upper end is movably fitted in a long hole 1a formed in the upper surface of the operation adjusting base 1. Therefore, when the shaft screw 2 is rotated from the outside of the sewing machine arm M by the knob 3, the stopper 4 is moved back and forth along the longitudinal direction of the shaft screw 2.

Reference numeral 5 denotes a feed amount changing shaft rotatably supported in the sewing machine arm M. This feed amount changing shaft is interlocked with the cloth feeding mechanism (not shown) as described above, and by rotating this, the cloth feeding amount in the sub feeding mechanism is changed. .. Reference numeral 6 is an L-shaped actuating lever, the middle portion of which is fixed to the feed amount changing shaft. The actuating lever 6 is biased together with the feed amount changing shaft 5 by a coil spring 7 inserted into the feed amount changing shaft 5 in the direction of rotation about the feed amount changing axis (direction A). The contact portion 6a protruding from one end is always brought into contact with the stopper 4 by the force. The other end 6b of the actuating lever 6 is sharply formed and is inserted into a long hole 8a of a scale plate 8 fixed to the front surface of the sewing machine arm, and this portion indicates the scale of the scale plate 5. Use it as a guide.

Reference numeral 9 denotes an actuating wire stretched between the actuating lever 6 and an operation pedal (not shown), and the actuating lever 6 is moved together with the feed amount changing shaft 5 in accordance with the pressing and releasing operation of the operation pedal. It can be rotated. Further, 10 is a stopper composed of a screw 10a and a 10b, and the screw 10a inserted into the elongated hole 8a of the scale plate 8 is fixed by a nut 10b. The amount of rotation of the operating lever 6 when pressure is applied, that is, the amount of downward movement of the operating lever 6 can be regulated.

In the operation amount setting device configured as described above, the positions of the stoppers 4 and 10 are set in advance according to the initial value and the changed value of the required operation amount when starting the sewing operation. Keep it. That is, with the stopper 4 and the contact portion 6a of the operating lever 6 in contact with each other, the stopper 4 is set in advance so that the operation amount set by the feed amount changing shaft 6 reaches a desired initial value, and the stopper 10 And the other end of the operating lever 6 are in contact with each other, the position of the stopper 10 is set so that the operating amount set by the feed amount changing shaft 6 becomes a desired changed value. Thus, even during the sewing operation, the operation amount can be instantly switched from the desired initial value to the changed value by pressing and releasing the operation pedal.

[0008]

[Problems to be solved by the device]

 However, in the above-mentioned conventional operation amount setting device, when the positions of the stoppers 4 and 10 are set, the knob 3 and the bolt 10a provided at positions separated from each other must be operated respectively, and the setting work However, there is a problem in that good workability cannot be obtained. Further, the stopper 10 is fixed to the scale plate 8 by a fastening structure composed of a screw 10a and a nut 10b. When the fastening state is slow, the operating lever 6 is contacted. The stopper 10 may be displaced along the long hole 8a of the scale plate 8 due to the impact of the impact. For this reason, the tightening of the screw 10a and the nut 10b needs to be performed firmly to prevent deviation, but when tightened firmly, it is difficult to change the position of the stopper 10, which is a conflict. A problem has occurred.

The present invention has been made in view of the above-mentioned problems of the prior art, and an operation amount setting that can easily set an initial value and a changed value of an operation amount in an operation feed machine to desired values. The purpose is to provide a device.

[0010]

[Means for Solving the Problems]

 This invention is provided with an initial value setting mechanism for setting the initial position of the feed amount changing axis and a change value setting mechanism for changing the changing position of the feed amount changing axis, and the initial value setting mechanism is rotatable on the sewing machine arm. Is supported by the outer shaft and has a screw portion and a shaft portion on the outer periphery, and one end of which is protruded from the front surface of the sewing machine arm, an initial value setting knob fixed to one end of the outer shaft, and the screw portion of the outer shaft. A stopper for initial value setting that moves forward and backward along a predetermined guide member by screwing with the outer shaft and a fixed rotation so that one end is fixed to the feed amount changing shaft and presses against the stopper for initial value setting. The differential adjustment arm and the actuating adjustment arm that is biased in the direction, and the initial value setting pointer that is fixed to the feed amount change shaft and that moves according to the rotational position of the feed amount change shaft. Change the feed amount against the applied urging force Rotate around the axis The change value setting mechanism has a cylindrical shape that is rotatably fitted to the outer circumference of the shaft portion of the center shaft, and a threaded portion is formed on the outer circumference to form one end portion. The outer shaft projecting to the front of the sewing machine arm, the change value setting knob fixed to one end of the outer shaft, and the screw part of the outer shaft are screwed together, and a predetermined guide member is rotated by the rotation of the outer shaft. It is configured to include a change value setting stopper that can move back and forth along with and can contact one end of the operation adjusting arm. The change value setting is rotatably supported, and one end thereof faces the pointer for setting the initial value, and the other end is always biased so as to be pressed against the one end of the change value setting stopper. A guideline may be provided.

[0011]

[Action]

 In this invention, the rotational position of the feed amount changing shaft, which determines the operating amount of the sewing machine, is determined by the rotational position of the operating arm fixed thereto, and further, the initial position and the changing position of this operating arm, that is, The initial value and the changed value of the operation amount are set by an initial value setting stopper and a changed value setting stopper that control the rotation range of the operating arm. Therefore, by adjusting the position of each stopper, the initial position and the changed value of the operation amount can be set to desired values, and each setting can be performed by rotating the center shaft and the outer shaft. The center shaft and the outer shaft have a double shaft structure in which they can be rotatably fitted to each other, and when setting the positions of the initial position setting stopper and the change value setting stopper, the operator must Since it suffices to operate the knobs that are fixed to the tip of the and are located at substantially the same position, the work can be performed easily and extremely good operability can be obtained. Further, since all the stoppers are in screw relation with the respective shafts, they do not move unless the knobs are rotated, and they do not shift due to impact when the operating arm abuts.

[0012]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the figure, reference numeral 20 is an operation adjusting base fixed to the sewing machine arm M, and bearing parts 20a, 20b, 20c protruding laterally are formed at both ends and an intermediate part thereof. Further, of these bearings, the bearing 20a located at the forefront is exposed on the front surface of the sewing machine arm M, and a scale m is engraved on the front surface.

Reference numeral 21 denotes a cylindrical outer shaft having an annular change value setting knob 22 fixed to one end thereof. The outer shaft 21 has a shaft portion 21a and a screw portion 21b. The shaft portion 21a is rotatably inserted into the shaft insertion holes 20a1 and 20b1 of the bearing portions 20a and 20b of the operation adjusting base 20, and the movement in the longitudinal direction is locked by the locking ring 23. Has been done. The reference numeral 24 designates a spring interposed between the locking ring 23 and the bearing portion 20b so that the outer shaft 21 can be prevented from inadvertently rotating.

Reference numeral 25 denotes a center shaft that is rotatably inserted into the outer shaft 21, and the center shaft 25 includes a shaft portion 25 a and a screw portion 25 b, and the screw portion 25 b projects from one end portion of the outer shaft 21. The end portion is rotatably inserted into the insertion hole 20b1 of the bearing portion 20c and is locked by the locking ring 27 so as to be movable in the longitudinal direction. Reference numeral 26 is a knob for setting an initial value, which is fixed to one end of the center shaft. Reference numeral 28 denotes a change value setting stopper that is screwed into the threaded portion 21b of the outer shaft 21, and 29 is an initial value setting stopper that is screwed into the threaded portion 25b of the center shaft 25. These stoppers 28 and 29 are both One side surface thereof is in contact with one side surface of the operation adjusting base 20, and the rotation value of the outer shaft 21 is a stopper 28 for setting a change value, and the rotation of the center shaft 25 is a stopper 29 for setting an initial value. It is adapted to move in the longitudinal direction of each axis along one side surface of 20.

Reference numeral 30 denotes a feed amount changing shaft rotatably supported on the sewing machine frame M by a bearing 31, and the changing shaft 30 is interlocked with a sub-feed mechanism 41, which will be described later, and its rotating position. By this, the amount of cloth feed by the sub-feed mechanism is changed. That is, the difference (differential amount) between the cloth feed amount by the sub-feed mechanism 40 and the cloth feed amount by the main feed mechanism (not shown) is changed.

Reference numeral 32 denotes an operation adjusting arm having an intermediate portion fixed to one end of the feed amount changing shaft 30, and an initial value setting pointer 33 is fixed to the side surface thereof. A sharpened support portion 33a is bent and formed at the tip of the pointer 33. The support portion 33a moves up and down together with the operation adjusting arm 32, and the scale m of the operation adjusting base 20 is pointed. It is supposed to be shown. The scale m represents the above-mentioned differential amount, and the above-mentioned pointer 33 indicates what differential amount can be obtained by the rotational position of the feed amount changing shaft 30 which is currently set. Is becoming The reference numeral 35 designates a coil spring inserted through the feed amount changing shaft 30 so as to urge one end portion of the operation adjusting arm 32 in the rotational direction in which 32a is constantly brought into pressure contact with the initial value setting stopper 29. ing. Reference numeral 39 denotes a wire whose one end is connected to the differential adjustment arm 32, and an operation pedal (not shown) is connected to the other end thereof, and the operation pedal and the wire 39 constitute a changing operation means.

Reference numeral 36 denotes an indicator for changing value setting, which is bent in an L-shape, whose middle portion is rotatably supported by the feed amount changing shaft 30, and has one end abutted against the changing value setting stopper 28. The contact portion 36b is provided so as to project, and the contact portion 36b is always urged by the pulling spring 37 so as to contact the change value setting stopper 28. Further, a sharpened support portion 36a is bent and formed at the other end of the change value setting pointer, and the support portion 36a supports the scale m of the operation adjusting table 20. .. Reference numeral 38 is a screw for preventing the change value setting pointer 36 from falling off.

Next, the sub-feed mechanism 40 applied to this embodiment will be described with reference to FIG. In the figure, the sub-feed mechanism 40 includes a vertical feed mechanism 40A that moves a sub-feed tooth 41, which is provided behind the main feed tooth (not shown) in the cloth feeding direction, in the vertical direction, and the feed tooth 41 in the horizontal direction. And a horizontal feed mechanism 40B for swinging, and a feed adjusting mechanism 40C for adjusting the cloth feed amount by the feed dog 41. Of these, the vertical feed mechanism 40A converts the rotation of the sewing machine main shaft M1 into the rotary swing motion of the feed amount changing shaft 45 via the swing rod 42, the connecting link 43, and the connecting arm 44, and this rotary swing motion is performed. Thus, the bifurcated swing arm 46 is swung up and down, and the up and down swing motion is transmitted to the feed dog 41 via a link 47 fitted to the swing arm 46.

The horizontal feed mechanism 40 B has a swing arm 49 rotatably supported by a feed amount changing shaft 48, and a connecting link 50 connecting the swing arm 49 and the feed dog 41. The connecting link 50 is horizontally swung by the swing motion of the swing rod 42, and the swing motion is transmitted to the feed dog 41. Therefore, the horizontal feed mechanism 40B and the vertical feed mechanism 40A perform four well-known movements by the auxiliary feed teeth 41.

Further, the feed adjusting mechanism 40C includes a feed changing arm 51 fixed to one end of the feed amount changing shaft 30, an arm body 53 fixed to the feed amount changing shaft 48, and the both arms. The connecting link 52 connects 51 and 53, and the connecting link 54 connects the arm 53 and the connecting arm 44. Then, when the rotational position of the feed amount changing shaft 30 is changed, the feed changing arm 51 rotates accordingly, and the arm body 53 rotates together with the feed amount changing shaft 48 via the connecting link 52. As a result, in the vertical feed mechanism, the connecting arm 44 rotates together with the feed amount changing shaft 45 via the connecting link 54, and the swing arm 46 rotationally moves. Therefore, the swing phase range of the swing arm 46 at the time of sewing changes, and the vertical movement amount of the auxiliary feed dog 41 accompanying the swing motion increases or decreases. Further, in the horizontal feed mechanism, the swing arm 49 is rotated by the rotation of the feed amount changing shaft 48, and the swing phase range is changed. Therefore, the horizontal swing amount of the auxiliary feed tooth 41 at the time of sewing is increased. Or decrease.

As described above, in the sub feed mechanism 40, the four movement loci of the sub feed dog 41 can be converted by rotating the feed amount changing shaft 30, and the feed amount of the cloth can be adjusted accordingly. In addition, the difference between the cloth feed amount by the main feed dog and the cloth feed amount by the auxiliary feed tooth 41, that is, the operation amount can be adjusted.

Further, the rotational position of the feed amount changing shaft 30 can be selectively retained and set at the initial position and a predetermined changing position by the operation amount setting device having the above-described configuration. That is, when the feed amount changing shaft 30 is kept at the initial position and the actuating amounts of the main feed dog and the auxiliary feed tooth 41 are set to the initial values and the pleat stitch or stretch stitch is performed, an operation pedal not shown in the figure is used. Is released. As a result, one end of the operation adjusting arm 32 is always in contact with the initial value setting stopper 29 by the action of the coil spring 35, and the rotation position of the feed amount changing shaft 30 is set to the initial position preset by the stopper 29. It is held and the required differential amount is obtained by the sub-feed mechanism.

Here, when the sewing operation reaches a portion for changing the differential amount, that is, a portion for changing the size of the pleats in the pleat stitching and a portion for changing the stretching amount in the extended stitches. Step on the operation pedal. As a result, the initial value setting pointer 33 and the operation adjusting arm 32 rotate against the coil spring 35, and come into contact with the contact portion 36b of the changed value setting stopper 28. As a result, the feed amount changing shaft 30 fixed to the operation adjusting arm 32 is rotationally moved from the initial position to a predetermined changing position, and the auxiliary feeding mechanism feeds the cloth at the feed amount according to the changing position, and the necessary amount is obtained. Sewing is performed with a differential amount of At this time, the indicator 33a of the pointer 33 for initial value setting indicates the same scale as the indicator 36a of the pointer 36 for changing value setting.

By the way, the initial position and the changed position of the feed amount changing shaft 30 set as described above are to be set by operating the initial value setting knob 26 and the changed value setting knob 22. Various adjustments can be made according to the initial value and the changed value of the differential amount. That is, when adjusting the initial position of the feed amount changing shaft 30, the initial value setting knob 26 is rotated in a predetermined direction and the center shaft 25 is rotated. Then, the stopper 29 for setting the initial value moves in parallel along the longitudinal direction of the center shaft, so that the operation adjusting arm 32, which is in contact with this stopper 29, resists or follows the urging force of the winding spring 35 and changes the feed amount. Rotate with 30. Then, the rotation of the knob 26 may be stopped at the time when the instruction portion 33a of the pointer 33 which rotates together with the operation adjusting arm 32 indicates the initial value of the operation amount to be set.

When adjusting the change position of the feed amount change shaft 30, the change value setting knob 22 is rotated to rotate the outer shaft 21, and the change value setting stopper 28 is moved in the longitudinal direction of the outer shaft 21. Move along. Then, the change value setting pointer 36 rotates around the outer circumference of the feed amount changing shaft 30 against or following the urging force of the pulling spring 37, and the position of the contact portion 36a changes. As a result, the rotational position of the operation adjusting arm 32 when the operation pedal is depressed, that is, the changing position of the feed amount changing shaft 30 changes. Then, the rotation of the knob 22 may be stopped at the time when the instruction portion 36a of the change value setting pointer 36 indicates the change value of the operation amount to be set.

As described above, the adjustment work of the initial value and the changed value is performed by using the adjustment knobs provided at the respective ends of the outer shaft 22 and the center shaft 26 having the double shaft structure and located at substantially the same position. As a result, the worker can work while keeping his or her hand in a fixed position, and the operability is greatly improved. Further, in this adjustment work, the pointer 33 for the initial value setting and the pointer 36 for the changed value setting are designed to indicate the differential amount set by the knobs 22 and 26, so that the operator can very easily perform it. Can set up.

In the above embodiment, the change value setting pointer 36 is provided in order to facilitate the setting of the change value that is currently set. However, without providing this, the differential adjustment arm 32 is directly changed to the change value. You may make it contact | abut with the stopper 28 for a further value setting. In this case, the change value may be set by depressing the operation pedal and reading the value indicated by the initial value setting pointer 33, and the present invention is not particularly limited to the above embodiment.

[0028]

[Effect of the device]

 As described above, the differential amount adjusting device for the differential feed sewing machine according to the present invention has the initial value of the differential amount which is the difference between the cloth feed amount by the main feed mechanism and the cloth feed amount by the sub feed mechanism. Since the change value can be set by rotating the outer shaft and the middle shaft, each of which has a dual-axis structure, the knobs for rotating each shaft can be placed close to each other at almost the same position. When setting the initial value and the changed value, the operator can set the initial value and the changed value of the differential amount with each knob while keeping his or her hand at a fixed position, and the workability is significantly improved compared to the conventional method. To improve.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment according to the present invention.

FIG. 2 is a perspective view of what is shown in FIG.

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

FIG. 4 is a side view showing the configuration of a sub-feed mechanism applied to the embodiment.

FIG. 5 is a perspective view showing a differential amount adjusting device in a conventional differential feed sewing machine.

[Explanation of symbols]

 20 Differential Adjusting Base (Guide Member) 21 Outer Shaft 21a Shaft Part 21b Screw Part 22 Change Value Setting Knob 25 Middle Shaft 25a Shaft Part 25b Screw Part 26 Initial Value Setting Knob 28 Change Value Setting Stopper 29 Initial Value Setting Stopper 32 differential adjusting arm 33 pointer for initial value setting 36 pointer for changing value setting M sewing machine arm

Claims (2)

[Scope of utility model registration request] 1. A main and sub cloth feed mechanism provided in front of and behind the cloth feed direction to feed cloth at different feed amounts, and a rotational position of a feed amount changing shaft provided on a sewing machine arm. In an operation feed sewing machine configured to selectively set the cloth feed amount by the sub-feed mechanism to a predetermined initial value and a changed value by selectively setting a predetermined initial position and a changed position, An initial value setting mechanism for setting an initial position of the feed amount changing shaft and a changing value setting mechanism for changing the feed amount changing shaft are provided, and the initial value setting mechanism is rotatably supported by the sewing machine arm. Along with this, the outer peripheral portion has a screw portion and a shaft portion, one end portion of which protrudes from the front surface of the sewing machine arm, a center shaft, an initial value setting knob fixed to one end portion of this outer shaft, and the outer screw portion By screwing and rotating the outer shaft A stopper for initial value setting that moves back and forth along a constant guide member, and a differential adjustment that is fixed to the feed amount changing shaft and is urged in a constant rotational direction so that one end of the stopper is pressed against the stopper for initial value setting. An arm, a pointer for setting an initial value that is fixed to the feed amount changing shaft, and moves according to the rotational position of the feed amount changing shaft, and the feed amount of the differential adjusting arm against the biasing force applied thereto as appropriate. And a change operation means for rotating the change shaft around the change shaft. Is formed, one end of the outer shaft protruding toward the front surface of the sewing machine arm, a change value setting knob fixed to one end of the outer shaft, and screwed to the threaded portion of the outer shaft, By moving forward and backward along a predetermined guide member by rotation, Differential amount setting device in the differential feed sewing machine for one end portion contactable change value setting stopper dynamic conditioner arm, by being configured by said. 2. The change value setting mechanism according to claim 1, which is rotatably supported by the feed amount changing shaft, has one end facing the pointer for setting the initial value, and one end always 2. The differential amount setting device in the differential feed sewing machine according to claim 1, further comprising: a change value setting pointer that is urged to come into pressure contact with one end of the change value setting stopper.