US2414652A - Sewing machine with adjustable cloth feed-motion - Google Patents

Description

M. LINIGER 2,414,652

SEWING MACHINE WITH ADJUSTABLE CLOTH FEED-MOTION Jan. 21, 1947-.

Fil ed. Oct. 1, 1945 2 Shee'ts-Sheet 2 I I Q lll Patented Jan. 21, I947 OFFICE- SEWING MACHINE WITH ADJUSTABLE CLOTH FEED-MOTION Max Liniger, Basel, Switzerland Application October 1, 1945, Serial No. 619,650 In Switzerland March 17, 1944 7 Claims.

, My invention relates to improvements in sewing machines in general, and in particular to cloth-feed motions adjustable in operation of the machine both as to size and direction of the grip thereof; and the main object of my improvements is to afford means and facilities permitting of changing the throw of the cloth-shifter both in size and sense of operation, i. e. forward or backward, during operation of the sewing machine.

I attain this and related objects by the mechanism shown, by way of example, in one embodiment in the accompanyin drawings, in which:

Fig. 1 is a longitudinal section through a portion of the free arm ofa sewing machine;

Fig. 2 a similarsection as in-Fig. 1, but showing certain parts in another operative position;

Fig. 3 a plan view of Fig. l with arm uncovered;

Fig. 4 a cross-section on the line IV-IV of Fig. l; and

Figs. 5 and 6 are cross-sectional views, leaving out certain parts, in two different adjusting positions. i

The machine illustrated and describedhereim after is of the portable type, comprising a free trough-like arm I, provided with a lid 3 and which serves as support for the piece of cloth to be sewn. A cloth-feed motion is disposed in the said arm, which latter is provided with the cross-walls 2, '4 and 35 at the other end of the arm (Fig. 3). The said motion is controlled by the shaft 5 which drives the shuttle (not shown) and which is journaled on its outer end in the cross-wall 2. The said shaft is driven by a motor and always turns in the same sense. The

vertically reciprocating needle performs a stitch A control lever 9 eratively connected with a control rod 41 through from the position of Figfl into that shown .Fig. 2, it is disengaged from the slot l0 so that the said control lever 9 is depressed into the position shown in the latter figure. The eccentric I5 is beveled on the side facing the control lever B, so that by displacing the former in the other direction the lever 9 is engaged with its slot ID on the eccentric and again occupies the position shown in Fig. 1. i

The top end of the control lever 9 is flanged-to forma head II, on which a cloth feeder I2 is secured. By depressing the lever B, in the manner described above, the feeder I2 is lowered below the working table so that the cloth, if such is desired, may be displaced thereon unhampered. In Fig. 13 the cloth feeder I2 has been omitted for the sake of clearness.

The control lever 9 further is provided with a laterally protruding eye l3, in which a pin M is mounted, 0n the eccentric l6, whichalso is mounted on the shaft 5 but is turned through a right angle relative to the eccentric I 5, a connecting rod I1 is pivoted, through which a pin is is passed. On one side of the connecting rod H, the pin 1-9 carries a strap l8 which in its turn is pivoted on the pin I4." On the otherside of the connecting rod the pin l9 carries a slipper 29 which is engaged in a slot 2|. The latter is cut from a rotatable sliding block 22 which on one part of its circumference is provided with teeth .23; The sliding block 22 is ridin on the one end of a pivot29 bearing in the cross-wall 4, and to the other end of which a set collar 38 is secured by means of a taper pin 3 I.

The helical spring 32, disposed between the set collar 30 and the cross-wall 4 on the pivot 29, constantly draws the sliding block 22 up against the cross-wall 4, thus subjecting the brake discs 33, which are disposed on the pivot 29 on the other side of the said wall, to a corresponding pressure. The toothed segment 25 of a regulating block 24 keyed to an auxiliary shaft 21 engages the teeth 23. The said auxiliary shaft 21, which is pivoted in the cross-walls 4 and 35, carries a regulating lever 26 by means of which the shaft 2'! may be turned for the amount desired. In the Figs. 4-6, the positions I and III indicate the terminal positions of the lever 26, while II is an intermediate position.

The cloth-feed motion described above operates as follows: The control lever B is vertically reciprocated through the intermediary of the eccentric l5 and the horizontal slot ID. The lateral movement of the lever 9 is controlled by the pin l4 passed through the eye l3 of the-lever. The

pin I4 is connected with the pin I!) by means of the strap l8. As long as the pin I9, which is driven by the connecting rod l1, moves in the vertical median plane, the lever 9 also is held fast in this plane by means of the strap I8, and is vertically reciprocated in its turn. This is the case, when the rotatable slot 2|, as shown in Fig. 3, stands vertical, since the slipper'ZiI then is also vertically reciprocated, as well as the pin Hi. When, however, the rotatable slot 2| is rocked out of its vertical position, i. e. approximately into the position of Fig. 5, the pin I9 travels from its bottom position, which is to the left of the median plane, into its top position which i to the right of the latter. ment in a horizontal direction is transmittedby The arising component of move Way of the strap I8, onto the pin 14 and thus onto 3 the control lever 9. Since the eccentrics l5 and I6 stand at right angles to each other, it is easily seen that the head portion l2 of the control lever 9 in this case describes a slightly distorted ellipse, the vertical axis of which is represented by the vertical movement of the eccentric I5, and the horizontal axis by the horizontal component of the movement of the pin Hi. The ellipse is slightly distorted, since the straps 1 and [8 do not afford perfect straight guides, but possess definite radii.

The feed is regulated, and the direction of feed is reversed by turning the slide block 22, accomplished by means of the toothed regulating block 24 and the regulating lever 26 by way of the regulating shaft 21. When the shaft 26 is laid horizontal, the rotatable slot 2! stands vertical, and the control lever 9 is not moved laterally. When the lever 26, on the other hand, is in the position I or III or intermediate of 1-H and II-III, the rotatable slot 2| is more or less inclined, the inclination either being from the left to the right or vice-versa. In correspondence to the angle of inclination the size of feed is established, and the feed direction of the cloth-shifter according to the sense of inclination. The size of feed thus may be changed as desired, and the sense of feed may be changed, and this during operation of the ma-- chine, since for releasing this change, only the non-following slide block 22 has to be turned.

1 Owing to the action of the spring 32 and the brake discs 33, the slide block 22 remains in its appointed position. To turn it, the frictional resistance of the brake discs 33 must be overcome I by means of the regulating lever 26.

What I claim and desire to secure by Letters Patent is:

1. In a sewing machine of the character described a cloth-feed motion adapted to be changed during operation of the machine both as to extent and direction of throw, comprising an eccentric displaceably keyed to the shuttleoperating main shaft of the machine, a clothshifter control lever adapted to be operatively engaged with or disengaged from the. said eccentric for the purpose of receiving an oscillatory vertical movement, a second eccentric keyed to the said shaft at an angular position relative to said first named eccentric, a connecting rod upon said second eccentric having a pin thereon, a transmission gear mounted on said pin for engaging said control lever for imparting oscillatory horizontal movement thereto, guide means for said pin permitting reciprocation thereof in a plane inclined to the horizontal plane, and adjusting means cooperating with said guide means for changing the plane of reciprocation of said pin for controlling the throw of the cloth-shifter both as to extent and direction.

2. A cloth-feed motion according to claim 1, in which the said guide means comprise a slotted slide block turned through the intermediary of the said adjusting means.

3. A cloth-feed motion according to claim 1,

in which the said guide means comprise a slotted slide block having a toothed segment and said adjusting means includes a member having a toothed segment cooperating with" said first named segment.

4. A cloth-feed motion according to claim 1,"

in which the said guide means comprise a slotted slide block keyed to a pivot; and a brake device adapted to engage the said block for the purpose of securing same against unintentional rotation. 5. A cloth-feed motion according to claim 1,

in which the said guide means comprise aislotted MAX LINIGER.

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