JPH041903Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a sewn product feeding device as defined in the generic concept of claim 1 of the utility model registration claim.

(Prior art) The sewing machine feed device described in the generic concept of claim 1 of the utility model registration claim is known (West German Patent Publication No. 3404530), in which the roller is mounted on a fixed support plate. It is held by a supported carriage which is movable directly - and oriented obliquely relative to the upper surface of the base of the sewing machine - by means of a compressed air cylinder. This device has rollers approximately 25~
After being lifted 30 mm, the roller immediately behind the sewing foot of the sewing machine is brought to a high position of inactivity. Due to the lifting movement directed obliquely to the sewing machine baseplate, the lowered roller approaches the trailing edge of the sewing foot shoe, so that the sewing part is directed towards the rear of the sewing foot shoe when lifting the roll. Once moved to the waveform. The known device thereby has the disadvantage that the pleats caused by the movement of the sewing part must be eliminated before the rollers can carry out an additional feed movement over the sewing part. On the other hand, the first
During the sewing stitches carried out after the start of sewing, the smooth sewing that should be possible by the cooperation of the step-like fabric feed and the shaft of the material feed device is not achieved.

(Problems of the invention) An object of the present invention is to create a sewn product feeding device whose sinking, and thus the roller resting on the sewn part, performs an additional feeding action on the sewn part immediately after the start of sewing.

(Means for solving the problem) This problem is solved by the features stated in the claims for utility model registration.

(Effect of the invention) With the sewing material feeding device according to the invention, the roller performs a rotational movement in the clockwise direction when descending from an inactive high position, and the roller can be seen on the head cover of the sewing machine. . This rotational movement causes the roller to rest on the sewing part, tensioning the area between the roller and the sewing part and exerting an additional feed on the sewing item. As a result, the product feed device is activated immediately after the start of the product to be sewn.

(Embodiment) In FIG. 2, reference numeral 1 denotes an industrial sewing machine of conventional construction, which has a sewing product feeding device 3 on the back side 2 of one arm. The arm shaft 4 is supported by an arm 5 of the sewing machine 1 in a known manner and drives a liftable needle bar and a link take-up. Since the needle bar and link take-up and their functions are well known, there is no need to describe them here.

An eccentric 6 is fixed on the arm shaft 4 and is surrounded by a bearing ring 7 of a tension rod 8. At the end point 9, the tension rod 8 is supported on a shaft 10, which accommodates a lever 11 and a connecting rod 12 in a pivotable manner. Axial movements of the tension rod 8, lever 11 and connecting rod 12 on the shaft 10 are avoided by means of commercially available adjustment rings or shaft fixing rings, which are not shown in FIG.

A further lever 13 is supported inside the arm 5, and this lever 13 is connected to an eccentrically arranged crankshaft 14.
has. The other end of the lever 11 is supported in a split bearing point in a known manner at a joint point 15, so that the pivotable bearing of the lever 11 is mounted on the crankshaft 1.
It is also possible on 4. According to FIG. 1, the crankshaft 14 is pressed around a crank disk 17 by the spring force of a tension spring 16. The crank disk is fixed on an axle 18, which is supported in the arm 5 and passes through it. Arm 5
Outside the rotary knob 19 is provided with a numerical mark for an indication of the degree of feed effect obtained by the roller 49, and the rotary knob is fixed to the shaft 18.

A shaft 20 is supported on the back side 2 of the arm by two bearing blocks 21. A one-way clutch 23 is arranged on the axis 20 in a manner known per se, the one-way clutch consisting of two interconnected freewheels 24 and 25. The structure and operation of the one-way clutch 23 for generating the stitch feed movement has been known for some time from German Patent Specification 2718607 and therefore will not be described further here. A pivot point 22 is provided on the underside of the freewheel 24, at which the free end of the connecting rod 12 is pivotably supported.

Furthermore, an adjustable brake 26 is provided on the shaft 20. As is clear from FIG. 4, the brake consists of a bush 27 fixedly disposed on the frame, and the bush has a commercially available key 31, for example.
accommodates a brake disc 28 which is non-rotatably mounted on the shaft 20. On the flange 29 belonging to the brake disc, two friction linings 30' rest against the end faces of the disc 32, according to FIG. The disk has a projecting nose 33 which engages in a groove 34 in the bush 27, thereby setting the disk 32 in a non-rotatable position. A commercially available ring screw is screwed into a screw hole 35 provided in the bush 27.
A compression spring 37 between the ring screw and the disk 32
is provided, and the spring force is applied to the ring screw 36.
It can be adjusted by rotating. As a result, the rotational movement of shaft 20 is more or less significantly damped.

In the other part of the shaft 20 there is a drive member 3 on the shaft.
8 is pivotably mounted, and the drive member is mounted by known means, for example on two adjusting rings or two
It is axially immovably disposed on the shaft 20 by two shaft fixing rings. The handle 71 is fixed to the drive member 38 and has a ball end 39 at its free end. Two locking holders 40, 40' are provided near the back side 2 of the arm, which can be switched into two lockable positions of the drive member 38. The drive member 38 belongs to a four-joint rotating chain 41, the support point of which is fixed to the second frame is formed by a joint point 42 provided on the back side 2 of the arm. A drive lever 43 is attached to the joint.
is mounted for pivoting movement. Drive member 38
a first point 44 of the drive lever 43 and a second point 45 of the drive lever 43
A connecting rod 46 is pivotally mounted on , by means of which connecting rod 46 connects drive member 38 and drive lever 43 to one another. Connecting rod 46 projects beyond point 45 and has a joint point 47 at its end. At this joint point, a lever 48 is rotatably mounted, and at its free end a roller 49 is rotatably mounted. As shown in FIG. 1, a stopper screw 75 is provided in the portion of the lever 48 that extends beyond the joint point 47, and there is a gap between the tip of the stopper screw 75 and the connecting rod.

Between the points 44 and 45, a further rotation point 50 is provided on the connecting rod 46, which is fixed to the connecting rod 46 in a manner known per se and is integrated with a projecting shaft, not shown here. ing. A two-armed lever 51 is rotatably supported on the shaft. The first arm is provided with a stopper screw 52, the end of which rests on a pressing surface provided on the connecting rod 46. A commercially available single-acting pneumatic cylinder 54 is suspended in a joint 53 at the free end of the second arm of the lever 51 with a spring return.
The pinton rod 55, which is accessible during the application of air pressure, has a bearing ring at its free end, which ring is accommodated by a joint point 56 provided on the lever 48.

The first toothed disc 57 is fixed to the shaft 20. The pivot connection of the drive member 38 to the connecting rod 46 at point 44 is held in place by an intermediate shaft 62. An intermediate shaft 62 and a second
A toothed disk 58 is fixed. The first winding transmission device 59 is formed by toothed disks 57, 58 and a toothed belt 60 surrounding them, which is tensioned by a tension roller 61 in a known manner. Can be hung. Third
A toothed disk 63 is fixed to the other end of the intermediate shaft 62. According to FIG. 1, a shaft 67 supported by a lever 48 has a roller 49 and a fourth toothed disc 6.
4 is fixed. The second winding transmission 65 is formed by toothed disks 63, 64 and a surrounding toothed belt 66, which is tensioned by means of tension rollers 68 in a known manner. The pivot connection between lever 48 and connecting rod 46 at point 47 is held in place by a shaft 69, at its free end a deflecting roller 70 for deflecting toothed belt 66 is rotatably supported. ing.

Next, the operation of the sewing product feeding device will be described.

By means of the eccentric 6 which rotates with the arm shaft 4, a vibratory movement is transmitted via the tension rod 8 and the connecting rod 12 onto the one-way clutch 24 according to FIG. The one-way clutch 24 allows a clockwise step angular movement of the shaft 20 during a leftward pivoting movement of the connecting rod 12, while the one-way clutch 25
acts in a known manner during a pivoting movement of the connecting rod 46 directed to the right so that the shaft 20 is not moved during this phase of movement of the connecting rod 46.

The crank transmission device, which consists of an eccentric body 6, a tension rod 8, a connecting rod 12 and a lever 11, and which has long been known as a sewing machine structure and a stitch length adjustment transmission device, has the structure shown in FIG. This makes it possible for the shaft 20 to carry out variable angular steps from almost zero to a maximum value. In the position shown in FIG. 1, in which the lever 11 and the connecting rod 12 are in the extended position, the shaft 20 performs no stepping movement. When the rotary knob 19 and therefore the cam disk 17 are rotated starting from the position shown in FIG. The angle between is reduced. The shaft 20 thereby performs a larger angular step via the one-way clutch 24. The crank transmission already described is shaft 2
0 rotates clockwise, making it possible to perform angular steps of different magnitudes. By the cooperation of the connected one-way clutches 24 and 25, the shaft 20
A completely intermittent rotational movement is guaranteed. A brake 26, which is likewise arranged on the shaft 20, has an adjustable braking force so that even when the sewing machine 1 is operated at high speeds, excessive vibrations of the shaft 20 due to the masses involved in the movement are avoided. taken into account, resulting in axis 20
The preselected step angle is maintained. This step angle is transmitted onto the roller 49 without slippage via the winding transmissions 59, 65.

Since the handle 71 is locked in the position of the locking holder 40' as shown in FIG. occupies a high position. The tip of the stop screw 75 now rests against the surface of the connecting rod 46 provided for this purpose. In applications where an additional intermittent roller top feed is not required, the rear area of the sewing foot 72 is thereby not compromised by other structural parts.

For particularly smooth sewing, the cooperation of the fabric step feed 73 with the roller 49, which rests directly behind the sewing foot 72 on the sewing part, is rational, the teeth of which can be temporarily removed in a known manner. protrudes above the upper surface of the throat plate 74. For this purpose, the handle 71 is lifted out of the locking holder 40' and pivoted up to the locking holder 40 and then locked. As a result, the four-bar rotation chain 41 is swiveled into the lower position that can be seen in FIGS. 1 and 2. The state of the winding angle of the toothed belt 60 on the toothed disc 57, which momentarily stops when the handle is turned in a preselected manner, is such that the toothed disc 58 passes through the toothed disc 65 to the roller 49.
Above the roller 49 is turned to perform a clockwise rotational movement. As a result of this rotational movement, the roller 49 exerts a tensioning effect on the area of the sewing part as soon as it comes into contact with the sewing part during its lowering, so that the sewing part projects on the back side of the shoe of the sewing foot 72.
This ensures that shaft 49 carries out an additional feeding action on the sewn part immediately after the start of sewing.

With the roller 49 resting on the sewing part, the roller is slightly raised when the compressed air cylinder 54 is energized with compressed air via the supply conduit 76 in a known manner. In this case, the piston rod 55 moves into the compressed air cylinder 54 by a specified path.
The lever 48 is moved in against the action of the compression spring located therein, whereby the lever 48 is pivoted slightly counterclockwise. The lifting of the rollers 49 thereby achieved makes it possible, for example, to backstitch for a sewing lock or to modify the sewing direction or to sew non-straight seams. Immediately after the air discharge of the compressed air cylinder 54, the compression spring located therein is relaxed, whereby the roller 49 is again compressed onto the support. The supporting pressure of the roller 49 is variable within preset limits by adjusting the stopper screw 13.

[Brief explanation of the drawing]

Figure 1 is a diagram of the kinematic principle of the sewing material feeding device.
Figure 2 is a front view of the arm head of the sewing machine with the product feed device, its rollers in the lowered position, and Figure 3 is the front view of the arm head of the sewing machine with the product feed device, its rollers in the inactive, rigid position. , a front view of the arm head of the sewing machine, FIG. 4 is a sectional view of a brake with variable braking force, and FIG. 5 is a perspective view of the back side of the sewing machine. Code in the figure: 20...shaft, 49...roller, 5
9,65... Wrap transmission device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A sewing product feeding device of a sewing machine, the sewing material feeding device is fixed to the back side 2 of the arm of the sewing machine 1 and above the sewing machine board, and at that time, the sewing material feeding device 3 is rotatable. It has a supported lever 48, on the free end of which a roller 49, which is arranged behind the needle in the sewing direction, is supported, the circumferential surface of the driven roller 49 being temporarily In the above-mentioned sewing product feeding device that presses a partial area located at the rear of the sewing foot portion 72 of the sewing machine 1 for the sewing product, the sewing material feeding device 3 has a drive link 38 that is attached to a shaft that is disposed in an upper range of the arm back side 2. a four-joint rotating chain 41 rotatably supported on 20;
A lever 48 is connected to the four-bar rotation chain 41 and rotatably supports the roller 49 via a shaft 67, and a compressed air cylinder 54 is disposed between the lever and the four-bar rotation chain 41. 48 and the drive link 3
The shaft 20 is mounted on an intermediate shaft 62 supported on the free end of the shaft 8.
a first wrap transmission device 59 that transmits the rotational motion of
and a second winding transmission device 65 for transmitting the rotational motion of the intermediate shaft 62 onto the shaft 67. 2. A four-bar rotational chain 41 has a drive link 38, a connecting rod 46 which is pivotally connected to the drive link 38 at a first point 44, and one end of which is pivotally mounted to the connecting rod 46 at a second point 45; 2. The sewing material feeding device according to claim 1, further comprising a driven lever (43) whose other end is rotatably supported at a joint point (42) provided on the back side of the arm. 3. The connecting rod 46 extends beyond the second point 45 to a joint point 47, at which the compressed air cylinder 54 is pivotally mounted on the connecting rod 46.
3. The sewing material feed device according to claim 2, further comprising a lever (48) mounted thereon which is pivotable via the lever (48), and a shaft (67) mounted on the free end of the lever (48). 4. A toothed disc 57 on which the first wrapped transmission device 59 is fixed to the shaft 20, and a second toothed disc 58 fixed to the intermediate shaft 62 provided at the first point 44. , and a toothed belt 60.
The described sewing material feeding device. 5. A claim in which the second wrapped transmission device 65 comprises a third toothed disc 63 fixed to the intermediate shaft 62, a toothed disc 64 fixed to the shaft 67 in the same way as the roller 49, and a toothed belt 66. Item 1: The sewing product feeding device according to item 1. 6. The sewing material feeding device according to claim 4 or 5, wherein the tension of the toothed belts 60, 66 is adjustable by tension rollers 61, 68 whose positions are variable. 7 Locking holder 40 or 4 to drive link 38
2. A device as claimed in claim 1, characterized in that the handle lever (71) lockable at 0' is fixed to the drive link (38). 8 The servo element grips the handle lever 71 and the servo element grips the handle lever 4
8. The sewing material feeding device according to claim 7, wherein the sewing material feeding device is pivoted after being released from 0 or 40'.