JPH0238698Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a differential amount adjustment mechanism in a lower differential feed sewing machine.

[Prior Art] An example of a conventional sewing machine differential amount (differential ratio) adjusting mechanism of this type is shown in FIG. 2 as a schematic perspective view.

(Structure) Since this mechanism is well known, only the main points will be explained. 20 is the main shaft (upper shaft) of the sewing machine, 21 is the vertical feed shaft, 22 is the main (horizontal) feed shaft, 1 is the sub (horizontal)
A feed shaft, 3 is a main feed adjustment body, 2 is its connecting rod, 4 is a sub-feed arm fixed to the sub-feed shaft 1, 5
6 is a differential adjustment rod; 7 is a differential ratio adjustment arm fixed to a differential lever shaft (auxiliary feed adjustment shaft) 8; 23 and 24 are feed dog drive rods 2, respectively.
The main feed dog and the sub feed dog fixed at 5 and 26 are shown. 27 and 28 are horizontal and vertical feed eccentric cams for the connecting rods 29 and 30 disposed on the main shaft 20, respectively, 31 is a main feed adjustment screw, 32 is a forward and reverse cam, and 33 is a forward and reverse cam. / Connecting rod for reverse feed. Further, 34 is a reverse feed lever, 34a is a shaft of the reverse feed lever, 9 is a differential lever (sub-feed adjustment lever) fixed to the differential lever shaft 8, and 10 is a reverse feed lever that connects the lever 9 to a differential lever base 11. It is a locking nut for fixing it. Reference numeral 12 denotes a stopper which is screwed along an elongated hole drilled in the lever base 11 so that its position can be adjusted, and is used for local shirring (gearing).

(Operation) In the above mechanism, by sliding the sub-feed angle piece 5 in the groove of the sub-feed arm 4, the fulcrum distance (arm length) of the sub-feed arm 4 from the sub-feed shaft 1 is controlled. By changing the amount of differential (differential ratio,
(sub-feed amount). To change the sliding position of the sub feed angle piece 5, the differential lever 9 is moved and the differential lever shaft 8 is rotated, and the sub feed angle piece 5 is moved via the differential ratio adjusting arm 7 and the connecting rod 6. , and the amount of feed of the sub-feed dog 26 was changed.

[Problems to be Solved by the Invention] However, in the conventional example as described above, the differential lever 9, lock nut 10, differential lever base 11, etc. that should be directly adjusted by the operator of the sewing machine are As shown schematically in Figure 3, on the bosom side (sewn fabric side) of the sewing machine (head) arm A,
Opposite side from the operator (sewing cloth feed direction W rear side)
The following problems arose due to the fact that the That is, 1. Due to oil leakage/seepage from the part where the operating lever shaft 8 passes through the bosom side of the arm A,
There was a possibility of staining the work cloth.

2 Lock nut 10 and differential lever 9 to be operated
Since the differential lever base 11 to which the differential lever base 11, etc. is attached is located on the opposite side of the operator from the rising part of arm A, when adjusting it, the operator moves in the opposite direction, or is in a position where he or she is looking into the arm from the base of arm A. It was necessary to carry out adjustment operations using the machine, which resulted in extremely poor workability.

3. Due to the reason stated in item 1) above, there was a possibility that the work cloth could be caught during sewing work.

4 The stopper 12 used during local shirring is
As described, since the differential lever base 11 is screwed along the elongated hole, it is necessary to loosen the screw each time to adjust its position.

5. Since the adjustment is performed by directly moving the differential lever 9, it is difficult to make minute adjustments.

The present invention was devised in view of the problems of the conventional example as described above, and allows all of this type of differential adjustment operation to be performed from the front on the operator side.
The object of the present invention is to provide a lower differential feed adjustment mechanism that allows for minute adjustments and is free from oil contamination.

[Means for solving the problem] Therefore, in the present invention, the reverse feed lever shaft in the conventional example is formed into a hollow shaft, and the differential lever shaft is connected to the sewing machine pulley side in the hollow part (see Fig. 3 P).
A differential lever is fixed to the end of the differential lever, and the lever is moved using two adjustment screws and a movable body, each of which has a knob at its tip facing the operator side. By configuring the system to do so, the above object is achieved.

[Function] With the above configuration, the differential amount adjustment and the position adjustment of the local shirring stopper can all be finely adjusted from the front side of the operator.
Further, it is possible to eliminate the risk of staining the workpiece cloth due to oil leakage or the like.

[Examples] The present invention will be described below based on Examples. FIG. 1 shows an explanatory view of the correspondence between an embodiment of the lower differential feed adjustment mechanism according to the present invention and FIG. 2 of the conventional example. Components that are the same (equivalent) as in FIG. 2 are indicated by the same symbols and overlap. Explanation will be omitted.

(Structure) In this embodiment, the shaft 34a of the reverse feed lever 34, which was a solid shaft in the conventional example, is formed into a hollow shaft (reverse feed lever 40), and the differential lever shaft 41 is passed through the hollow part. One end is pivotally supported on the machine frame, and a differential lever 43 is fixed perpendicularly to the axis at the other end in the direction of the pulley of the sewing machine. Differential lever shaft 41
Similarly to the conventional side, the sub-feeding arm 4 is connected via an arm fixed near the shaft support end of the
The feed amount of the sub-feed dog 24 is changed by moving the sub-feed piece 5 that slides within the groove.

On the other hand, two adjustment screws 44 and 45 as adjustment rods having head knobs located in the front direction of the operator, which are a short distance away from the main body of the differential lever 43 and substantially perpendicular to the main body, are attached to the machine frame. The adjusting screws 44 and 45 are arranged so as to be rotatable, and each of the male threaded portions of both adjustment screws 44 and 45 has a mechanism having the differential lever 43 and each engaging pin portion, which sandwich the differential lever 43 in the front-rear direction on the operator side. Each moving body 46, 47 in the form of a threaded modified nut is provided and threadedly engaged with each external thread. The screw 44 is connected to the differential lever 4
engages with a moving body 46 that adjusts the rotation angle of No. 3;
Used as a differential adjustment screw (sub feed double adjustment screw). Further, the screw 45 is engaged with a movable body 47 that functions as a stopper used during local shirring, and is used as a position adjusting screw for this stopper. The differential lever 43 is always biased toward the operator's side by a tension coil spring 48 whose one end is fixed to the machine frame, and is always in elastic contact with the movable body 46. The two movable bodies 46, 47 are supported to prevent co-rotation due to rotation of each adjustment screw (means not shown).

(Operation) Next, the operation in the above configuration will be explained. The final drive mechanism/operation of the main feed dog 23 and the sub feed dog 24 by the main feed adjuster 3 and the sub feed arm 4 is exactly the same as that in the conventional case shown in FIG. 2.

First, in order to adjust the differential amount (ratio) by adjusting the sub-feed amount, turn the differential adjustment screw 44 on the front side of the operator
When the knob is rotated to the left or right (large or small), the movable body 46 moves in the direction of the widening screw axis, and the bias spring 48 keeps the differential lever 43 in constant contact with the pin portion of the movable body 46. By touching and swinging in a predetermined direction and rotating the differential lever 41, a desired amount of sub-feed can be easily adjusted from the front of the operator using a screw.

Further, the position of the stopper 47 during local shirring can be easily and finely adjusted to a desired position by rotating the G knob of the stopper adjusting screw 45 in either the left or right (larger or smaller) direction. be able to.

In addition, the differential adjustment screw 44 and the stopper adjustment screw 4
5, and the threaded portions of the movable bodies 46 and 47 that engage with these, depending on the degree of fine adjustment required.
A thread (2 threads) or a single thread (single thread) may be used.

[Effect of the invention] As explained above based on the examples,
According to the present invention, in response to each of the problems of the conventional example described above, 1. Since the operating lever is disposed on the pulley side of the sewing machine arm, there is no risk of oil leakage to the bosom side of the sewing machine that processes the workpiece cloth. There is no longer any risk of soiling the fabric.

2. Because the adjustment mechanism is placed in front of the operator, workability is extremely improved.

3. Also, due to the reason mentioned in item 1) above, the fear of the work cloth being caught is also eliminated.

4, 5 Not only the position of the stopper for local shirring can be adjusted, but also the differential ratio can be adjusted easily and finely because the screws are used to adjust the differential ratio.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of an embodiment of the lower differential feed adjustment mechanism according to the present invention, FIG. 2 is a diagram corresponding to FIG. 1 of a conventional example, and FIG. 3 is a diagram corresponding to FIG. 2. FIG. 2 is an explanatory diagram of the arrangement of a conventional mechanism in a sewing machine. 1...Sub feed shaft, 3...Main feed adjustment body, 4...Sub feed arm, 5...Sub feed piece, 22...Main feed shaft, 23...Main feed dog, 24...Sub feed dog, 34...Reverse feed lever,
40... Reverse feed lever shaft, 41... Differential lever shaft, 4
2...Differential adjustment rod, 43...Differential lever, 44...
Differential adjustment rod, 45...Stopper adjustment rod, 46, 47
...Adjustment body, A...Sewing machine (head) arm, P...Pulley.

Claims (1)

[Scope of utility model registration request] A reverse feed lever shaft disposed inside the head arm of the sewing machine in the shape of a hollow shaft in the arm length direction, a differential lever shaft passing through the hollow part of the lever shaft, and a sewing machine pulley side of the differential lever shaft. A differential lever fixed to the end, a differential adjustment screw and a stopper adjustment screw rotatably supported on the sewing machine frame and having a knob at the tip, one end supported by the differential adjustment screw, and the other end supported by the differential adjustment screw. a movable body disposed opposite to the differential lever and moved in the axial direction by rotation of the differential adjustment screw; and one end supported on the stopper adjustment screw and the other end opposite to the movable body of the differential lever. A lower differential feed adjustment mechanism for a sewing machine, comprising: a stopper disposed opposite to the stopper and moved in the axial direction by rotation of a stopper adjustment screw.