JP2000005472A - Differential feeder of sewing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use common principal component elements for a mechanism adapted for the horizontal feed of a main feed bar fitted with a main feed dog as well as for a mechanism adapted for the horizontal feed of an auxiliary feed bar fitted with an auxiliary feed dog. SOLUTION: In a differential feeder of a sewing machine, having a main feed bar 11 fitted with a main feed dog 12 at its end portion, an auxiliary feed bar 14 arranged in parallel with the main feed bar 1 and fitted with an auxiliary feed dog 15 at its end portion, a first mechanism for imparting reciprocating horizontal movement to the main feed bar 11, a second mechanism for imparting reciprocating horizontal movement different from that of the main feed bar to the auxiliary feed bar 14, and a third mechanism for imparting common reciprocating vertical movement to the main and auxiliary feed bars, the first mechanism has a rocking shaft 8 rocking in synchronism with a main spindle 1 and a connecting element 9 secured to the rocking shaft 8 and the main feed bar 11 while having an arcuate groove cut therein, and the second mechanism has a pin element 22 slidable within the arcuate groove in the connecting element 9, a holding element 10 pivotally attached to the auxiliary feed bar 14 at one end and holding the pin element 22 at the other, and an adjustment means 20 for rotating and displacing the holding element 10 relatively to the auxiliary feed bar 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a differential feed device for a sewing machine.

[0002]

2. Description of the Related Art As is well known, a sewing machine is provided with a differential device for making a horizontal feed amount of a main feed dog and a horizontal feed amount of a sub feed dog different from each other in order to expand and contract a material to be sewn. There is. An example is disclosed in Japanese Utility Model Publication No. Sho 61-2535. Thus, in this differential device, a first link mechanism that converts the rotation of the main shaft into a swing and applies the reciprocating horizontal movement to the main feed base that supports the main feed dog, and a rotation of the main shaft. A second link mechanism that converts the swing into a different amount of swing from the swing on the main feed base and applies the reciprocating horizontal movement to the auxiliary feed that supports the auxiliary feed dog; At the same time, an up-down link mechanism for reciprocating up-down movement is provided.

[0003]

However, in the above-described differential device, the first link mechanism and the second link mechanism are different from each other, even though the main feeder and the sub feeder are arranged side by side. , And are completely separate and independent. As a result, not only is the structure of the entire differential device complicated, but also the number of components is increased.

[0004] Therefore, in view of such a problem, the present invention, in a differential device of a sewing machine, includes a main component and a sub-feed dog of a mechanism that controls horizontal feed of a main feed bar on which a main feed dog is mounted. The technical problem is to make the main components of the mechanism for controlling the horizontal feed of the mounted sub-feed stand common.

[0005]

In order to solve the above-mentioned problems, the means taken in claim 1 is a main feeder provided with a main feed dog mounted at a distal end thereof, and a main feeder which is juxtaposed to the main feeder and has a distal end. And a first mechanism for applying reciprocating horizontal movement to the main feeder, and applying a reciprocating horizontal movement to the sub-feeder different from the reciprocating horizontal movement of the main feeder. In a differential feed device for a sewing machine including a second mechanism and a third mechanism that imparts a common reciprocating vertical movement to the main feeder and the sub-feeder, the first mechanism swings in synchronization with a main shaft. A swinging shaft and a connecting body provided with an arc-shaped groove and fixed to the swinging shaft and the main feed base, wherein the second mechanism is slidable in the arc-shaped groove of the connecting body; Pin body,
A sewing machine comprising: a holding member having one end pivotally connected to the sub-feeding stand and the other end holding the pin body; and adjusting means for rotating and moving the holding body with respect to the sub-feeding stand. That is, a moving feed device is configured.

[0006]

In the configuration (first technical means) according to the first aspect of the present invention, the first mechanism and the second mechanism are connected to each other to transmit a rocking motion transmitted from the rotation of the main shaft. As a common component, both mechanisms can be simplified as compared with the related art.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the accompanying drawings.

1 and 2, the sewing machine has a main feeder 11 having a main feed tooth 12 mounted at a tip end thereof, and a sub feed dog 15 mounted at a tip end thereof side by side with the main feeder 11. A sub-feed stage 14 is provided.

A square piece 17 is fitted in the distal end portion of each of the main feed base 11 and the sub feed base 14 so as to be movable in the horizontal direction. An eccentric cam 16 fixed on the left end of the main shaft 1 is rotatably fitted inside the hole in which the square top 17 is formed. The distal end of both the sub-feed 11 and the sub-feed 14 are reciprocated up and down.

[0010] The rear ends of both the main feed bar 11 and the sub feed bar 14 are supported by a shaft 18 fixed to the machine frame so as to be movable in the axial direction (horizontal direction). The positioning of both rear ends on the shaft 18 is performed by a pair of collars 19 fixed on the shaft 18.

A feed cam 2 is fixed on the right end of the main shaft 1 so as to be eccentric with respect to the main shaft 1. on the other hand,
At the left end of the feed adjustment shaft 4 held by the machine frame,
Are mounted so as to be movable in the radial direction, and when the main shaft 1 rotates, a feed rod 3 for connecting the feed cam 2 and the square top 5 is provided.
Are reciprocated along the longitudinal direction.

The feed rod 3 is also pivotally connected to the upper end of the feed link 6 via a pin 41. The lower end of the feed link 6 is pivotally connected via a pin 42 to a feed arm 7 fixed to a feed shaft 8 rotatably supported by the machine frame. The feed shaft 8 is swung. The swing amount can be adjusted by rotating the feed adjusting shaft 4 and changing its angular position.

A connecting body 9 is integrally mounted on the left end of the feed shaft 8, and a right base 9a of the connecting body 9
The arm 1 whose right end is connected to the main feed base 11 by a screw 47
0 is fixed to the left end with a screw 46. Since the shaft 8 swings as described above, this swing is caused by the connecting body 9.
To the main feed base 11 to make the main feed base 11 reciprocate horizontally. Since the main feed bar 11 is reciprocated up and down, the main feed bar 11 makes an elliptical motion as a whole, and the main feed dog 12 advances the cloth (not shown).

An arc-shaped groove 9b extends through the left end of the connecting member 9, and a pin 22 extends through the groove 9b. Both ends of the pin 22 are supported by a forked portion formed at the left end of the feed member 10, and the right end of the feed member 10 is sub-feeded by the pin 34 so as to be relatively displaceable (adjustable angular position). It is connected to the table 14. Thus, the swing of the shaft 8 is transmitted to the sub-feeding stand 13 via the connecting body 9, the pin 22 in the groove 9 b of the connecting body 9 and the feeder 10, and
3 reciprocates horizontally. Then, the sub-feeder 1
3 is reciprocated up and down;
Moves the fabric forward in an elliptical motion as a whole.

Thus, as is apparent from the above description, the fabric is advanced by both the main feed dog 12 and the sub-feed dog 15, but by providing a difference in the horizontal feed amount between them, the fabric can be expanded and contracted. Can be given. That is, the horizontal feed amount of the sub-feed dog 15 (the sub-feed stage 14) is determined by the swing amount given to the sub-feed stage 14, and the swing amount is determined by the pin 22 integrated with the sub-feed stage 14. Adjustment can be performed by changing the position of the coupling body 9 in the groove 9b to which the swing is transmitted from the shaft 8.

In this regard, if the pins 22 are located at the uppermost end and the lowermost end of the groove 9b of the connecting member 9, the pins 22 and the sub-feeder 14 will be the longest and the shortest, respectively. The shortest horizontal feed amount will be given. Thus, the movement of the pin 22 in the groove 9b is caused by the pin 2 at the upper end.
2 is fitted to the lower end of the lever 20 and the right end is
Lever 3 pivotally attached to an arm 21 fixed to the machine frame by 3
This is performed by using a mechanism constituted by pivotally attaching to the left end of the device 1 with a pin 32. Specifically, in this mechanism, by moving the pin 32 up and down, the position of the pin 22 can be changed, and the horizontal feed amount of the auxiliary feed dog 15 can be appropriately adjusted.

As described above, the main components of the mechanism that controls the horizontal feed of the main feed bar 11 on which the main feed dog 12 is mounted are the swing shaft 8 and the connecting body 9 and the sub feed dog 15 The main components of the mechanism that controls the horizontal feed of the sub-feed stage 14 on which is mounted are a swing shaft 8, a connecting body 9, a pin 22, and a feed arm 10. Thus, the two mechanisms can share the main configuration, simplifying the structure of the entire apparatus and reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a differential device for a sewing machine according to the present invention.

FIG. 2 is an exploded perspective view of a main part of the differential device of the sewing machine according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main shaft 8 Oscillating shaft 9 Connecting body 9b Arc-shaped groove 11 Main feeder 12 Main feed dog 14 Sub feeder 15 Sub feed dog 20 Lever (adjustment means) 22 Pin body 31 Lever (adjustment means)

Claims (1)

[Claims] A main feeder having a main feed dog mounted at a tip thereof;
A sub-feeder which is juxtaposed with the main feeder and has a sub-feeding tooth mounted on a tip end thereof, a first mechanism for imparting reciprocating horizontal movement to the main feeder, a reciprocating horizontal movement of the main feeder on the sub-feeder A second mechanism for providing a reciprocating horizontal movement different from the movement, and a third mechanism for applying a common reciprocating vertical movement to the main feeder and the sub-feeder.
A differential feed device for a sewing machine having a mechanism;
The mechanism includes a swinging shaft that swings in synchronization with a main shaft, and a connecting body provided with an arc-shaped groove and fixed to the swinging shaft and the main feed bar. A pin body slidable in an arc-shaped groove of the body, one end pivotally connected to the sub-feeding base and the other end holding the pin body, and moving the holding body with respect to the sub-feeding base. A differential feed device for a sewing machine, comprising an adjusting means for rotating and shifting.