Cutting – Tool engages work during dwell of intermittent workfeed – Work-sensing means to control work-moving or work-stopping...
Patent
1981-06-11
1983-12-27
Yost, Frank T.
Cutting
Tool engages work during dwell of intermittent workfeed
Work-sensing means to control work-moving or work-stopping...
83276, 83277, 83367, 83371, 226114, B26D 532
Patent
active
044223579
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for advancing a predetermined length of strip-shaped material from a supply roll to a delivery point. Such apparatus includes a pull-off mechanism having a reciprocable pull-off means over which the strip runs, and a one-way means disposed between this mechanism and the delivery point, through which the strip runs.
The Danish patent specification No. 130 883 discloses an apparatus of this type for applying handles to parcels which are moved past in substantially equidistant positions on a conveyor, and this apparatus has an applying means that is connected to the pull-off means and which moves in and out of the gap between two parcels while exerting a resilient pressure against the parcels to attach adhesive faces of the strip to the side faces of the parcels. The apparatus also has a knife which on attachment of the strip moves down between the parcels and cuts the strip length between them. The function of the apparatus thus relies on each handle having been applied to a parcel before said handle is severed from the strip.
However, it is desirable in many cases that the apparatus can deliver a ready, severed handle at a delivery point where it can be held in a waiting position by a suitable holding assembly. The object of the invention is to provide an apparatus of the present type which can solve this task with great precision, i.e. in such a way that the severed handle is given exactly the desired predetermined length and is placed exactly in the holding assembly.
This object is achieved by the provision of a gripper arranged to be reciprocated in synchronism with the pull-off means and, at its one extreme position, to grip the end of the strip of material, as well as a strip brake and a detector arranged to detect a mark on the strip and in response thereto cause the gripper to open so as to release the strip, and the strip brake to be actuated. The detector, which may e.g. be a photocell, can determine the strip position with an almost arbitrarily desired precision, and the only moving parts which the detector signal is to actuate are one jaw of the gripper, the strip brake and a short length of the strip itself. These parts have quite a small mass so that the processes required to stop the strip can be effected practically instantaneously.
Simple embodiments of the drive mechanisms of the pull-off means and the gripper and of means for synchronizing their movements are described below.
The advantage of a further embodiment of the apparatus is that the strip length advanced per working cycle may be varied merely by displacing a pneumatic cylinder and the impact point of a piston rod on a pivot arm, such adjustment having no influence on the relation between the two controlled movements.
Shears controlled as stated in claim 6 may expediently be used for separating the advanced strip length from the rest of the strip.
The invention will be explained more fully below with reference to the drawing, in which:
FIG. 1 is a diagrammatic and inclined axonometric view showing the parts of an embodiment of the apparatus of the invention which are disposed along the strip path itself, as well as a strip roll and a strip being advanced;
FIG. 2 is a likewise diagrammatic and inclined axonometric view showing the drive mechanisms of the moving parts;
FIGS. 3 and 4 are diagrammatic, inclined axonometric views showing parts of the gripper and its operating mechanism in a closed and an open state, respectively; and
FIG. 5 is a wiring diagram of an electric circuit for the control of certain apparatus functions.
The parts shown in FIGS. 1 and 2 may e.g. be mounted at their respective sides of a mounting plate, not shown. In FIG. 1 the symbol 10 designates a roll of strip material 11 intended to form handles for application to parcels, not shown. The strip may e.g. be polypropylene with adhesive on one side to which a piece of paper 12 adheres at intervals, and the strip is severed at the center of the adhesive sections 13 so as to impart to each handle a non-adhesive center portion
REFERENCES:
patent: 1859962 (1932-05-01), Ferenci
patent: 3175444 (1965-03-01), Spinney
patent: 3702673 (1972-11-01), Zernov et al.
patent: 3776441 (1973-12-01), Forthmann, Jr. et al.
patent: 4011708 (1977-03-01), Brown, Jr.
patent: 4079645 (1978-03-01), Nunes et al.
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