Elongated-member-driving apparatus – With means to assemble plural pieces of work – With driver acting through clamp jaw
Patent
1997-06-02
1999-06-01
Smith, Scott A.
Elongated-member-driving apparatus
With means to assemble plural pieces of work
With driver acting through clamp jaw
227 37, 227 18, 227135, 227149, A41H 3710
Patent
active
059081481
DESCRIPTION:
BRIEF SUMMARY
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a device for fitting rivets, buttons or the like, which consist of an article lower-portion and an article upper-portion, to a fabric or the like, with a lower tool serving as abutment for the article lower-portion and a ram executing the riveting stroke, the lower end of which ram forms an upper tool impinging upon the article upper-portion and the upper end of which ram cooperates with a rotatingly driven cam disc controlling the travel movement, and with jaws displaceable in the direction of movement of the ram, which jaws, in order to provide a finger protecting function, stop in a position spaced from the lower tool after a first lowering movement, an electrical switch being actuated during this first lowering movement, actuation of the switch stopping the device if the spaced position is not reached, and which switch, after the spaced position is reached, permits the subsequent second lowering movement of the jaws.
A device of the kind in question is known from DE 33 13 351C2, a cam plate and a cam disc being keyed onto the drive shaft of a motor, disposed axially one after the other. The upper end of a ram engages, spring-biased, against the circumferential surface of the cam plate, while a roller of a linkage consisting of an upper rod and a lower rod engages on the face-side track of the cam disc. The lower rod is a carrier for the jaws. A tension spring acts on the upper rod, which spring biases the roller into a position of engagement against the inner surface of the track. A further tension spring acts in the sense of moving the upper rod and lower rod apart from one another. Each rod carries one contact of a switch, which contacts are held in a position of engagement by one of the tension springs. By switching on the motor, both the ram and the jaws are displaced in a downward direction. If the jaws cannot move downwards to their first spaced position, the finger protecting spacing cannot therefore be complied with, the jaws with the lower rod thus stop, while the upper rod, cam-driven, moves further downwards. The contacts of the switch open thereupon and instantaneously stop the drive. If, on the contrary, the finger protecting spacing is complied with, the downward drive is not interrupted.
SUMMARY OF THE INVENTION
An object of the invention providing a device of the type in question in a simpler manner, to be less susceptible to wear and at lower cost, while retaining the proven design and a reliable sequence of functions.
According to the invention, in a device with the introductory-mentioned features, this task is solved in a device with the features of claim 1, the ram, stopping for a brief period between a first and a second lowering movement, takes the jaws along with it in identical movement over its entire downward path, the jaws, in a single-sided free movement in relation to the ram, being coupled to the ram against the force of a spring, which spring is loaded either on application of the jaws to the fabric or when the finger protecting function is triggered, along with a relative movement between ram and jaws and a switch actuation.
As a result of an embodiment of this kind, there is provided a device of especially simple design and high reliability for fitting rivets, buttons or the like. On account of the jaws which are taken along by the ram in identical movement during its downward stroke, one single cam plate or cam disc only suffices to drive both the ram and the jaws. There is thus provided a single-sided free movement of the jaws on the ram, in such a way that the jaws stop after application to the fabric or on triggering of the finger protecting function, while the ram is displaced further in a downward direction. This relative movement results in a switch actuation, upon which the drive of the device stops immediately when the finger protecting spacing is not complied with. The spring force then acting on the jaws is chosen so that, for example, on impingement upon a finger, no injuries are caused to sa
REFERENCES:
patent: 4199094 (1980-04-01), Birkhofer
patent: 4343423 (1982-08-01), Sauermilch
patent: 4541558 (1985-09-01), Herten
patent: 4598468 (1986-07-01), Yoshieda
patent: 4606487 (1986-08-01), Douri
patent: 4645110 (1987-02-01), Taga
patent: 4703882 (1987-11-01), Herten
patent: 4724990 (1988-02-01), Yoshieda
patent: 4741466 (1988-05-01), Birkhofer
patent: 4789089 (1988-12-01), Toyota
patent: 5014895 (1991-05-01), Ito
patent: 5501001 (1996-03-01), Kamps
Kochs Karl-Josef
Kopatz Hans-Dieter
Calve James P.
Farber Martin A.
Smith Scott A.
William Prym GmbH & Co. KG
LandOfFree
Device for fitting rivets, buttons or the like does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for fitting rivets, buttons or the like, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for fitting rivets, buttons or the like will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-950157