DE2250015A1 - GRIP LUBRICATION FOR CYCLIC SEWING MACHINES - Google Patents

Description

Günter Tolle

Wendelinusstr _β 15

Hook lubrication

for
cyclical sewing machines

The invention relates to the lubrication of rotating lockstitch grippers for cyclic sewing machines, e.g. buttonhole sewing machines, bartack sewing machines, button sewing machines and similar sewing machines, in which regularly on the completion of a self-contained and out of a proportionate small number of stitch sets existing seam patterns a machine standstill phase follows »

The relevant lubrication of rotating lockstitch grippers is a particularly difficult technical problem, since sufficient lubricant supply is higher indispensable in the conventional sewing machines in modern gripper speed of Io ooo U / min. In addition, any lubricant escaping from the gripper path leads to contamination and / or damage to the sewing material and must therefore be avoided with certainty. Another circumstance that affects proper hook lubrication is the fact that sewing machines cannot be expected to run at a constant speed.

For the lubrication of all-round lockstitch hooks you need a such a large number of different prior art arrangements that they are not dealt with in detail here can. In particular, it is known to control the flow of lubricant from a supply point to the gripper track as a function of to control the speed «so that ibex Maeeliliisnstillstancl di ©

Lubricant supply is completely cut off and takes place at maximum speed with the maximum amount. It is well known Facilities also common, in the area of the gripper track, collecting means to be arranged that catch any superfluous lubricant thrown off during the gripper run and put it in the storage container so that contamination of the sewing material is avoided as far as possible. To dose the amount of lubricant are various means known individually and in combination; such dosing options exist in the use of lubricant pumps, whose performance depends on the speed, in the use of oil lines with a small and variable cross-section and in the Utilization of the capillary forces of materials accommodated in the oil lines, such as wicks and the like.

The known devices for the metered supply of the running track of circulating lockstitch grippers work according to their principle more or less that the amount of lubricant is sufficient for comparatively long machine running intervals However, these known facilities are no longer satisfactory, if, in the case of cyclic stitch group sewing machines, the standstill intervals match the running intervals in change faster and more regularly, and if the running interval is comparatively short. It is true with this cyclical mode of operation less the risk that the lubricant supply is inadequate, but rather the possibility here of the excess lubricant and thus the risk of contamination of the sewing material. This exists to a particular degree Danger in such stitch group sewing machines where, for reasons that are not of interest here, the hook in the sewing machine is arranged above the sewing material.

The invention is based on the object of providing lubrication for, in particular, rotating lockstitch grippers which

- 3 409816/1 OH

are adapted to the special conditions of the cyclical sewing machine in such a way that an overdose of lubricant with Security is avoided

The invention is based on the knowledge obtained through "investigations is based on the fact that a comparatively extremely small, in the rest state on the gripper track point by point or in places The amount of lubricant applied is sufficient to cover a relatively small, but at least sufficient number of hook rotations to ensure proper operation for the formation of a seam pattern group «

The essence of the invention is thus that a small amount of lubricant is pointwise supplied during machine standstill of the gripper raceway, and that the connection of the grippers running web is completely interrupted to the lubricant reservoir with the insertion machine operation _c, the inventive method of lubrication is therefore just the reverse of the usual Lubrication processes in which the supply of lubricant to the gripper track is prevented when the machine is at a standstill «

The technical means that are to be arranged on the sewing machine to carry out the lubrication method according to the invention are simple, robust and operationally reliable. Apart from the advantageous effect described, these means require a significantly lower technical effort than the known regulated lubrication devices for rotating double quilted grippers. Since the program control of the lockstitch gripper always comes to a standstill in the cyclically operating sewing machines in the same predetermined position ₉ , a device according to the invention consists of a movable lubricant pipe which is mounted at one point on the sewing machine and which, with its opening at the free end, is in one Swivel position with the gripper track at one point in contact

0 9-816 / 10U

intervention arrives, while it is in its other pivot position in a remote from the gripper track and the gripper barrel is held non-obstructive position, the position control of the lubricant pipe directly or indirectly from the Cycle control of the sewing machine is derived. A capillary insert in the lubricant tube ensures that the lubricant is transported from a storage container to the pipe mouth · A simple pressure screw can be used in the made of flexible material Connection between the oil reservoir and the lubricant pipe, the line cross-section and thus the oil flow rate per Time unit can be changed in the usual way.

Of course, in the context of the invention, it is not a mandatory requirement that the opening of the lubricant pipe is immediate takes effect on the outer surface of the gripper raceway. Depending on the structural conditions of the sewing machine, other supply line variants are also available conceivable »According to a further arrangement according to the invention, it is possible to open the lubricant pipe from the rear of the gripper by means of an opening provided in the gripper wall to take effect when the machine is at a standstill. In this case, the movement of the lubricant tube can be a simple straight line, making a particularly advantageous one Storage of the lubricant pipe in the sewing machine housing becomes necessary «In this case, it is in the hook body behind the opening the formation of a pocket advantageous in which the lubricant is deposited from the lubricant tube and when the Greifer is forwarded to the career path in a manner known per se »

The invention will ι illustrated by the accompanying drawings of an exemplary embodiment in detail as follows

- 5 -4Q9816 / 10U

In the drawings show:

1: the partial front view of a lubricating device according to the invention button sewing machine in the rest position omitting the view "obstructing and for the invention of insignificant cover parts "

Fig. 2: a front view like Fig. 1, however in operating position

3 i is a side view, partly in section, of the buttonhole sewing machine according to FIG.

Fig. 4: a variant of the invention Lubrication device *

In the drawings, the reference numbers mean:

1 Sewing machine housing e 2 Gripper arm 2a Guide groove 3 Fabric support arm k Bearing block (for clamp lever) 5 Fabric support plate 6th Material clamping device 7th Clamp lever 8th needle 9 Needle bar Io Grapple 1oa Breakthrough (in the rear wall of the gripper) 11 Bobbin case 12th Gripper track 13th Pressure roller aging

13a claw (am

1If lubricant reservoir

15 Lubricant line

16 wick filling

17 Lubricant Tube

18 compression spring

19 swivel shaft

20 swivel bearing

21 lubricant pipe support 21a spigot (on 21)

22 ventilation levers
22a nose (at 22)

23 bearing journals (for 22) 2if limit screw

25 guide pins

26 GUIDE ROD

27 Lubricant regulating screw

28 rail ₍

29 Pressure Roller

30 levers

31 fabric clamp frames

32 pocket (in the gripper)

33 Looper shaft

34 bearing bush

35 housing rib

36 joint clamps

37 pivot pins

38 handlebars

The invention is used in connection with a buttonhole sewing machine described, the - see »Fig. 1 to 3 - with a needle piercing the workpiece from below to above and thus with above the workpiece is equipped with a lockstitch looper 1st · The invention is special for this type of machine

4 0 9 8 1 6/1 0

Meaning, but it is by no means limited to this type of construction, but can also be used for grippers below.

In the buttonhole sewing machine shown in FIGS. 1 to 3, the revolving Itoppelstichgreifer 1o with its bobbin case 11 is arranged in the gripper arm 2, which is pivotably mounted on the lower part of the sewing machine housing 1 by means of a horizontally lying pivot shaft 19 «, the sewing machine housing 1 is with a Fabric support arm 3 is provided, below which the needle bar 9 carrying the needle 8 is arranged with its drive. The workpiece is clamped between a fabric support plate 5 resting on the fabric support arm 3 and a fabric clamp frame 31 which is carried by the fabric clamp lever 7 articulated on the bearing block i * The pivot axis 19 is moved into the boom position shown in FIGS. 1 and 3 by the lever 3o ", which is driven by mechanical, electrical, pneumatic or hydraulic means from the program switch of the sewing machine.

So that during the pivoting movement of the gripper macaw 2 from its working position according to FIG. 2 into its booth position according to FIG. 1 with a slight phase shift, the fabric clamping frame 31 is also lifted off the fabric support plate 5 in order to be able to remove the workpiece, the fabric clamping frame 31 and the gripper arm 2 assigned the following gear connection? Parallel to its lower support surface, the cloth clamping frame 31 is assigned a rail 28 with which a pressure roller 29 cooperates, which is fastened by means of a fork-shaped pressure roller holder 13 to a guide rod mounted in the gripper arm so as to be displaceable in the vertical direction. A compression spring 18 arranged between the gripper arm 2 and the pressure roller holder 13 urges the pressure roller 29

40981.6 / 1QU

31 in connection with installation of the rail 28 of the fabric clamping frame Am DruckrollenhaliH ·] 3 is the fabric clamping device extending claw 13a arranged a laterally into the region of the lower edge 6a. The guide rod 26 carries a guide pin 23 which extends perpendicularly to it and which interacts with a guide groove 2a arranged in the gripper arm 2. This arrangement works as follows:

At the beginning of the lifting movement of the gripper arm 2, the cloth clamping frame takes 31 did not take part in this movement. Only when, in relation to FIG. 2, the lifting movement of the gripper arm 2 has progressed so far is that the lower end of the guide groove 2a strikes against the guide pin 25, is in the further lifting movement the pin 25 and thus also the fabric clamping frame 31 are raised and the sewn workpiece is released for removal.

The previously explained part of the buttonhole sewing machine does not form the subject of the invention} but knowledge of this type of machine is required to understand the invention. At this Sewing machine, the lubricating device designed according to the invention for the rotating lockstitch looper consists of the following Arrangement:

A correspondingly designed lubricant tube 17 is attached to one free end of a lubricant tube carrier 21 designed as a two-armed lever, which is rotatably attached to the gripper arm 2 by means of a pivot bearing and is provided at its other end with a pin 21a acting as a stop. This pin 21a extends into the movement path of a release lever 2Z _t which is pivotably mounted on a bearing pin 23 fixed to the gripper arm and is guided on the side by a limiting screw 2fy. As shown in particular in FIGS. 1 and 2, at one end of the air erb θ'b-the 22 is one for interacting with the pin 21a

- Q -

A09816 / 10U

certain nose 22a formed while the other end of the air lever 22 extends into the path of movement of the guide pin 25. The lubricant pipe 1? is by means of a flexible lubricant line 15, which can be made of plastic, for example, is connected to the lubricant container 1 if by the gripper arm 2. Of the The lubricant is transported in a manner known per se through a in the lubricant pipe 17 and in the lubricant line 15 stored and in the lubricant container 1 if reaching wick filling 16 by capillary action, with a lubricant regulator screw 27 to change the cable cross-section the lubricant line allows. The wick filling 16 protrudes at the open end of the lubricant tube 17.

This lubrication device works as follows:

When the machine is at a standstill, the relative position of the individual parts according to FIG. 1 is given. The opening of the lubricant pipe 17 is located directly in front of the gripper track 12, so that the protruding wick material 16 touches the gripper track 12 and deposits a small amount of lubricant at the point of contact. When connected to the start-up of the machine lowering of the gripper arm 2 from its idle position shown in Fig.1 of the lubricant pipe is in the operating position according to FIG. 2, initially at unchanged position 17 of the fabric clamping frame 31 in clamping engagement 5 with the material support plate at the then following further lowering If the fabric clamping frame 31 and thus also the guide pin 25 no longer participate, so that the release lever 22 is now given a counterclockwise movement according to FIGS Position is in which the lubricant «? !!! ⁰ i? With the soiasm-free end of the rapier track 12 is removed ©

After completion of the sewing process, the parts described move in the opposite direction, the return of the fan lever 22 and the lubricant tube carrier 21 to the so-called rest position according to Hg. 1, preferably by the weight of the components, but possibly also by return springs. It is essential that the lubricant pipe 17 is securely locked in its pivoted position according to FIG.

Of course, within the scope of the invention there are many possible modifications with regard to the design of the means for displacing the lubricant pipe 17 with respect to the gripper Io and the derivation of its drive from the program control devices of the sewing machine. 4 shows a construction within the scope of the invention, which can also be used without further ado when the gripper is arranged below the sewing material to be processed. In the possible solution according to FIG displaceably mounted, which is arranged in a bearing rib 33 of the sewing machine housing in the immediate vicinity of the hook shaft bearing bushing 34.In this case, the lubricant pipe is attached to a joint block 36 in the area of its connection to the lubricant line 15, which is connected to a link 38 via a joint pin 37 which is driven in a manner not shown by a gear part involved in the standstill circuit of the sewing machine.In the example according to FIG predetermined position of the breakthrough loa the Schmi Ermittelrohr 17 faces · Behind the Durohbruch loa is the gripper with a pocket-like

- 11 -

409816/1014

Recess 32 is provided, from which in a "known manner" leads go out to the hook track. When the machine is at a standstill will the lubricant pipe 1? into the pocket 32 of the gripper introduced and deposits a small amount of lubricant there by touching the wall © ine that is necessary for the subsequent sewing process is conveyed into the gripper path by centrifugal force «This pocket 32 can also be filled with a capillary agent ·

Careful tests have shown that in the invention The amount of lubricant introduced in this manner is on the one hand so tight that a lubricant overflow that is applied to the sewing material Could be thrown off, does not occur, but that on the other hand, the amount introduced for proper lubrication even with the highest occurring in stitch group sewing machines Working speeds is guaranteed

409816 / 10U (f

Claims (3)

Bruchsal - k *. ^ u u Wendelinusstr. 15 Hook lubrication for cyclical sewing machines · Patent claims 1.) Process for metered lubrication of rotating Lockstitch grippers on cyclical sewing machines, especially buttonhole sewing machines, Bar sewing machines and button sewing machines, characterized in that the lubricant is applied to the gripper in each one Sewing process is fed in a metered amount to the following machine downtime 2.) Method according to claim 1, characterized , that the lubricant is supplied by stationary contact of a lubricant carrier with the gripper, 3.) Device for carrying out the method according to claims 1 and / or 2, in a stitch group sewing machine, in particular a buttonhole sewing machine, with a container for the hook lubricant and a flexible lubricant line emanating from this with a capillary filling,
characterized in that a lubricant filled with capillary means and connected at one end to the lubricant line (15) A09816 / 10U " ² " middle tube (17) is movably mounted on the sewing machine housing with respect to the gripper (1o), that the Schraiermittelrohr (17) is assigned a special holding means (21; 36), and that this holding means (2.1; 36). is held in two preferred setting positions via drive connections (22, 25, 26J 36, 38} depending on the program control of the sewing machine. ι + ») Device according to claim 3 in a stitch group sewing machine with a gripper arranged above the workpiece in a pivotable upper arm and a fabric clamping frame arranged on this upper arm by the formation of the holding means (21) for the lubricant pipe (17). as a two-armed lever mounted on the gripper arm (2) by pivot pin (2o) in such a way that during the pivoting movement of the holding means (21) the open end of the lubricant tube (17) is moved on a path that intersects the gripper path (12) Gripper arm (2) by a bearing pin (2.3) pivotably mounted release lever (22) with a nose (22a) arranged at its one end with a pin (21a) of the lubricant tube holder (21) and at its other end with one of the movement of the Cloth clamping frame (3 \) participating FUhrungezapfeii (25) is in drive connection. 5) device close to claim 3, characterized in that the holding means (36) for the sotomiarmitt-alrolir is auegabüdet as an articulated block, that the tube (17) is mounted longitudinally, in general, a Qeläuaeripge (35) in the area of the gripper shaftBXagwbiiisliee (3h) let, and that also the gripper wall at a predetermined Place with an opening (loa) and a pocket-like recess (32) behind it is, and that a link (38) is arranged for the drive connection of the lubricant pipe holder (37), 6) device according to claim 5, characterized in that a capillary in the pocket-like recess (32) Means is arranged. 409816 / 10U