US2004129A

US2004129A - Apparatus for handling strip material

Info

Publication number: US2004129A
Application number: US585519A
Authority: US
Inventors: Potdevin Adolph
Original assignee: Potdevin Machine Co
Current assignee: Potdevin Machine Co
Priority date: 1932-01-08
Filing date: 1932-01-08
Publication date: 1935-06-11
Anticipated expiration: 1952-06-11

Description

June 11, 1935. A. POTDEVIN 2,004,129

APPARATUS FOR HANDLING STRIP MATERIAL Filed Jan. 8, 1932 IN V EN TOR.

M We" ATTORNEYS.

Patented June 11, 1935 UNITED STATES APPARATUS FOR HANDLING STRIP MATERIAL Adolph Potdevin, Garden Qity, N. Y., assignor to Potdevin Machine Company, Brooklyn, N. Y., a corporation of New York Application January 8, 1982, Serial No. 585.519

8 Claims. (01. 271-2.2)

lar material.

One of the objects of my invention is the provision of a construction whereby the usual slack is produced in the material prior to the cutting-01f operation, means being provided, however, whereby tension is maintained in the material between the point of cut-off and the feed rollers thereby preventing wrinkling or creasing of the material. This is particularly advantageous when handling cellophane or similar material inasmuch as creases or wrinkles therein cause the material to crack and shatter unfitting the material for use.

lnthedrawing: Fi l is a sectional elevational view of an em- 1 :nent of my invention;

Fi 2 is a view with the parts in difierent position; and

Fig. 3 is a plan view.

Referring to the drawing in detail, land 2 desite, respectively, the upper and lower feed rollers of a bag making machine, these rollers advancing the material 3 to a pair of pinch rolls t and 5 and from thence to advancing rollers t and 1.

Intermediate the feed rollers and pinch rolls I provide cutting-oil mechanism comprising the plates 8 and 9 and striker bar It. The construction sofar mentioned is well known.

When handling cellophane or similar material I prefer to heat the plate 9 slightly by the application of a heater ll thereto which may be an electric hot plate.

The pinch rolls 4 and 5 travel at a lower peripheral speed than the feed rollers l and 2 and hence when the active portion l2 of the pinch roll 4 moves to operative position the advance of the material 3 is retarded to produce a slack in the material which is desired for the cutting-01f operation.

The present invention has for one of its objects means whereby thlsslack will be confined to the space between the striker bar III and the

pinch rolls

4 and 5 so that at no time will there be slack material between the striker bar It and the feed rollers I and 2. This is of advantage with any material but is particularly advantageous when working with cellophane as creases or wrinkles in cellophane cause the same to crack and shatter and unfit it for use.

In this connection I provide a rod J3 intermediate the striker bar It and the pinchrolls. This rod is fixed and the material 3 as it passes to the pinch rolls passes over the top of this bar or rod and is supported thereby.

At the rear of the pinch rolls I provide a shaft It adapted to be rocked in the frame of the machine, this shaft carrying apair of arms l5 which are curved beneath the lower pinch roll 5 and carry a flat plate I6 at their free ends adjacent the rod or bar l3. The shaft i4 is additionally equipped with an arm ll provided at its free 10 end with a roller or cam follower l8 adapted to engage a cam Is on the shaft for the lower pinch roll 5.

Overlying the plate It is an air nozzle 20 receiving air under pressure from any suitable source.

In operation the material 3 is advanced by the feed rollers I and 2 past the cut-off station, over the rod or bar l3, to and across the plate 16,

pinch rolls

4, and 5 and to the advancing rollers 6 and I. It will be appreciated by those familiar with this art that the pinch rolls 4 and 5 travel at a lower peripheral speed than the feed rollers. and also that'they are timed so that until a predetermined length of material has been advanced,

these two rolls will not pinch the paper. At the proper time, however, these two rolls engage or pinch the advancing strip and inasmuch as the peripheral speed ofthese rolls is lower than that of the feed rollers a slack will be created in the material 3 by the continued forward feed thereof. The air supply to nozzle 20 is on while the machine is operating, and the cam I9 is so shaped and so timed that as the slack in the material accumulates the plate I6 moves downwardly. As the air blast is on duringthis period the slack portion of the material will be driven downwardly to maintain tension in the material from the rod or bar l3 back to the feedfollers l and 2, to prevent wrinkling or creasing of that portion of the material. The .force of the air blast it will be understood is suflicient to maintain tension in I the material during the cutting-oi! operation also. W

From the foregoing,

therefore, it will be seen that I have provided an apparatus for handling What I claim is:

1. In apparatus of the class described, the combination of feed rollers for continuously advancing a flexible web or strip, pinch rolls in the path of the advancing strip having a peripheral speed lower than that of the feed rollers to produce a slack in the material, and means to apply an air blast to one face of the material during the slackiorming. operation.

2. In apparatus of the class described, the combination of feed rollers for continuously advancing a flexible web or strip, pinch rolls in the path of the advancing strip and cooperating with the feed rollers to produce a slack inthe advancing material, a plate beneath the advancing material for supporting the slack, and means for applying an air blast to the upper face of the material during the slack-forming operation.

3. In apparatus ofthe class described, the combination of feed rollers for continuously advancing a flexible strip or web, pinch rolls in the path of the advancing material, the pinch rolls and feed rollers traveling at diiferent peripheral speeds to produce a slack in the web, a pivotally mounted plate between the feed rollers and pinch rolls for supporting the material during its passage to the pinch rolls, means for applying an air blast to the other face of the material during the slack-forming period, and means for pivoting said plate in a direction away from the web during the slack-forming period.

4. In apparatus of the class described continuously operating web advancing means, retarding means in the path of the advancing web or strip for producing a slack in the web or strip, a plate beneath the web for temporarily supporting the slack and means to apply an air blast to the upper face of the material immediately above said plate during the slack-forming operation.

5. In apparatus of the class described, the combination of web or strip advancing means, retarding means in the path of the advancing web or strip for producing a slack in the advancingmateapplying an air blast to the upper face of the.

material during the slack forming operation.

7. In apparatus of the class described, the combination of feed rollers for continuously advancing a flexible web or strip, pinch rolls in the path of the advancing strip and cooperating with the feed rollers to produce a slack in the advancin material, a plate beneath the advancing material disposed intermediate the feed rollers and pinch rolls for supporting the slack, and means for applying an air blast to the upper face of the material immediately above said plate during the slack forming operation.

8. In apparatus of the class described, the combination of feed rollers for continuously advancing a flexible strip or web, pinch rolls in the path of the advancing material, the pinch rolls and feed rollers traveling at different peripheral speeds to produce a slack in the web, a pivotally mounted plate between the feed rollers and pinch rolls disposed beneath the material for supporting the material during its passage to the pinch r0115, means for p ying an air blast to the other face of the material abreast of said plate during the slack forming period and means for pivoting said plate in a direction away from the web during the slack forming period.

ADOLPH POTDEVIN.