DE356204C - Sewing machine - Google Patents

Description

GERMAN EMPIRE

ISSUED JULY 18, 1922

REICH PATENT OFFICE

PATENT LETTERING

- JVl 356204. CLASS 52 a GROUP 18

(S5244g VUlsaa)

The Singer Manufacturing Company of Elizabeth, New Jersey, V. St A,

Sewing machine.
Patented in the German Empire on March 9, 1920.

According to the Union Treaty of June 2, 1911, priority is due to this application of the application in Great Britain dated April 22, 1919.

For certain types of sewing machines, such as buttonhole cutting and sewing machines Sewing machines, a starting device that can be influenced by hand comes to the initiation of a working cycle for application.

; This starting device ends in a finger piece, which is arranged next to the sewing point and above the workpiece carrier.
j Since the stitch-forming device of such ^; Machines one or more below the

3562Ö4

Has workpiece carrier arranged lower stitch-forming organs, it is for access to this necessary to move the workpiece carrier far outwards in order to avoid the to expose the space occupied by the lower stitch-forming organs.

There is also the finger piece of the starting device for the purpose of easy access is expediently arranged in close proximity to the sewing point ίο, it often happens that the Workers adjusting or threading the lower stitch-forming organs (lower needle or Gripper) accidentally touches the finger piece and the machine starts up at an inopportune time puts. This can injure the worker or damage parts of the machine will.

In order to avoid this disadvantage, according to the invention, through a finger piece to be actuated starting device arranged so that in the event of any necessary displacement of the workpiece carrier in an exceptional location, the starting device for Starting the machine is rendered ineffective.

For this purpose, the finger piece is stored on the workpiece carrier and arranged in such a way that that its rearward-reaching part controls the movement on a transmission organ transmitted, which is connected to the usual starting clutch of the machine. If therefore the worker is forced to move the workpiece carrier, such as for Threading the lower needle or for the purpose of setting one of the below the workpiece carrier located parts, the mentioned rearward-reaching part of the finger piece carried by the workpiece carrier moved to a position in which he can no longer transfer the movement to the starting clutch. Becomes the workpiece carrier returned to its normal position, the finger piece is again in one position brought where it is effective for starting the machine.

In the drawing, an embodiment of the invention is illustrated, for example, namely is

Fig. Ι a perspective view of a buttonhole sewing machine of the invention.

Figure 2 is a perspective view of one half of the fabric clamp.

Fig. 3 is a horizontal section through the stand of the machine, with the foot and the workpiece carrier in plan view . are shown. \

Fig. 4 is a vertical section through one half of the fabric clamp of Fig. 2.

In the following description, 1 the term "backwards" denotes the direction from ^:

away from the sewing point, and the expression »vor-:

downwards «the ¹ direction running towards the sewing point.

The machine frame is ι from the foot, the stator 2, the machine arm 3 and the head 4, in which the needle bar 5 with the needle 6 goes up and down, which for their part ¹ cooperates with a lower curved needle. 7

The fabric clamp consists of the lower clamping plates 8 and the upper clamping feet 9, which sit swingably at the free ends of the arms 10, which in turn with their other ends are attached to blocks 11. The latter sit on bearing journals 12 that are in on the plates 8 attached arms 13 are mounted.

The clamping plates 8 are of the usual sliding plate 14 with the downward Lugs 15 carried, the usual, carried by the sliding frame 16 cross bar 16 'include slidably.

On the upper side of the front part of the sliding plate 14, a plate 17 is fastened, the straight rear edge of which is used for manufacture; an overhanging flange 18 is undercut, which in turn engages via flanges at the front ends of the plates 8. ! The latter are at their rear ends on the sliding plate 14 by overlapping blocks! 20 kept that. on the sliding frame 16: are fastened. The blocks 20 and the plate 17 ' form a transverse sliding guide, and: the plates 8 can in this) outside! be moved. The right and left; lying halves of the cloth clamp are; by means of spring-loaded locking! lever 20 ^α and resiliently held by springs 2ο ⁶ 'in their normal working position in the sliding guide. The locking levers 2Q ^a are mounted at 20 ^c on the sliding plate 14, while the springs 20 ^δ are fastened to their associated plates and their rearwardly projecting ends press outwards against stops 20 ^ of the sliding frame 16.

The knife drive shaft 31 can be equipped with a continuously running cord pulley 37 by means of a coupling which is known per se and which causes a single rotation get connected. The latter consists of a ι to driven disk 38 which is mounted on the shaft 31 is attached and an outwardly protruding and spring action coupling tooth 39 which, when released, engages with one of the circumference of the driving disk 41 and inward shoulders 40.

The coupling tooth 39 is through the flanged end 42 of the one Controlled arm of an angle lever 43,44, which is mounted on the foot 1 at 45 and usually in the one shown in Fig. 3, except

Engagement with the clutch located position is held by a spring 46, which with one end to the arm 44 of the bell crank and the other end to 47 attacks on the stand.

This coupling is known per se; it is sufficient hence, -to mention that when the worker pulls the flanged end 42 of the lever arm 43 inwardly towards the stator 2, the clutch tooth 39 is released and then in engagement with the drive pulley 41 is brought for a single revolution, whereupon the coupling tooth of the. Drive pulley through the curved edge of flange 42, not shown is withdrawn.

The stitch-forming device, which is stationary while the buttonhole cutting device is operating, is provided with a starting and stopping device which is automatically activated by the cutting device ¹ after the buttonhole slot has been cut, so that the worker only needs to start the knife drive shaft, whereupon the machine automatically cuts and sews the buttonhole.

According to the invention, a finger lever 48 is used, the front The end 49 is expediently arranged near the sewing point and is swingable by the one Half of the cloth clamp is worn. The lever 48 is like this with the angle lever 43, 44 connected that when the worker pulls the two parts of the clamp very far outwards moves to expose the lower stitch-forming links for adjustment or threading, the connection between the finger lever 48 and the angle lever 43, 44 is interrupted so that the finger lever for starting the machine is ineffective.

The two-armed finger lever 48 (see Fig. 4) is loose on an outer shoulder of the bearing journal 12 stored for one of the upper clamping arms 10 and is at its front End resiliently held raised by a spiral spring 50, which the bearing pin 12 surrounds. At its rear end, the finger lever 48 carries a wear plate 51 which under the inwardly bent end of the forwardly projecting arm 53 of an angle lever engages, which is mounted at 54 on the stand 2 and has an upright arm 55. The latter is connected to the front end of a rod 56, which at her rear end on the arm 44 of the angle lever 43, 44 engages.

When the two parts of the cloth clamp are in their usual position (see Fig. 3) are located, a pressure on the button 49 by means of the transmission elements described causes a retraction of the flange of the clutch tooth 39 and thus starting the machine. Now there is the release button 49 is mounted on one of the fabric clamp halves and this shifted outward or must be removed from the machine to expose the organs underneath, the worker can thread the lower needle or the looper carefree or adjust and check other parts arranged below the fabric clamp, without only, as was customary up to now, to have to operate some kind of safety device, which prevents the machine from being restarted unintentionally, leading to injury of the worker or damage to the machine.

Claims (2)

Patent Claims: 1. Sewing machine with a workpiece carrier that can be moved by hand, when the machine is at a standstill, and with a starting device consisting of a series of connections, which end in a finger lever, characterized in that the finger lever (48) is mounted on a part (12) which with the workpiece carrier (8) is movable, so that when the workpiece carrier is moved (8) to a position in which the lower stitch-forming device is exposed becomes, the series of connections (48, Si, 53. 55, 56) between the finger lever (48) and the starting device (43, 44) is interrupted. 2. Sewing machine according to claim r, whose workpiece carrier consists of separable halves consists, each of which has a fabric support plate and a clamp foot, thereby characterized in that the finger lever (48, 49, 51) on one of the separable Halves of the workpiece carrier is mounted and out of engagement with the other parts the starting device arrives when the relevant half of the workpiece carrier to expose the under her Parts of the machine is moved. For this purpose ι sheet of drawings.