US2600068A

US2600068A - Device for removing individual sheets from a stack

Info

Publication number: US2600068A
Application number: US77304A
Authority: US
Inventors: Otto B Meyers
Original assignee: Markem Machine Co
Current assignee: Markem Imaje Corp
Priority date: 1949-02-19
Filing date: 1949-02-19
Publication date: 1952-06-10
Anticipated expiration: 1969-06-10

Description

June 10, 1952 oQB. MEYERS 5 5 DEVICE FOR REMOVING INDIVIDUAL SHEETS FROM A STACK Filed Feb. 19, 194

Patented June 10, 1952 DEVICE FOR REMOVING, INDIVIDUAL SHEETS FROM A. STACK Otto B. Meyers Quakertown, Pan, assignor to Markem Machine Company, Keene,- N. IL, a. corporation of New Hampshire Application February 19, 1949, sesame. 77,304,

7 4 Claims.

This invention relates to a pickup device for separating and removing the top sheet from a pile or stack ofsheets.

'There are various manufacturing operations which involve marking individual pieces which ultimately form part of a completed article, and when such pieces are in sheet form, it is a common practice to do this by means of a marking machine, in which case a pile or stack of such sheets to be marked is placed on the bed or platen of a marking machine so that at each downward operative movement of the printing head the latter will make an imprint on the top sheet, and as each sheet is thus marked, it is peeled'off or removed from the top of the pile thereby exposing the next sheet underneath for the marking operation.

If the sheets being marked are made. of paper or some other sufficiently non-porous material,

the removal of each sheet from the top of the pile as it is marked can be successfully accomplished by means of suction cups or the like, but if they material operated on is cloth or some other relatively porous material, suction cups are not practical for this purpose.

In the garment industry it is customary to mark various garments such as collars, shirts, underwear, etc., with some notation indicating the size of the garment, and the marking is frequently done on pieces of cloth before they are made up into the complete garment. Such pieces of cloth to be marked'are generally arranged in a pile, which may contain two or three hundred sheets or pieces, and placed on the bed of the marking machine so that at each operation of themachine the top piece or sheet of the pile will be suitably marked. The removal from the top, of the pile of each piece or sheet ofcloth as it is marked is usually done by hand, the operatoriseizingor picking up the top piece on the pile as soon as it is marked and flipping; it back out. of the way and removing it from the pile thereby exposing the next sheet for marking at the next operative movement of the printing head.

The operators speed limitation in thus picking up the top marked sheet. andremoving it from the piledepends upon her adeptness in seizingthe top piece of cloth between her fingers and pulling itv back, and thus removing it from the pile.

Moreover it sometimes happens that. an operator. will grasp the top two sheets or pieces instead of the top-piece only and will thus remove from the stack not only the marked piece but also an unmarked piece.

It is one of the-objects of my present invention to providean improved pickup'device which can be used for thus picking up and removing from a pile the-top sheetas it is marked, which is capable of operation at a higherspeed than that usually attained by an operator who is performing this operation by seizing the top sheet with her fingers.

Another object of the invention is to provide a device for this purpose'which at each operation will lift andremove only a single sheet from the topof thestack or pile.

These objects areattained by means of a pickup device which isequipped with a pressure sensitive adhesive pickup material such for instance as Scotch tape, which pressure sensitive adhesive material is so arranged that by bringing the pickup device into pressure contact with the piece of cloth to be picked up, there will be sufficient adhesion between the cloth and the pressure sensitive adhesive tape to lift the top piece only andremove it from the pile. Such pickup device may bearranged to be operated automatically as a. part of the machine or it may be operated manually by the machine attendant. In either case, however, the speedat which the device may be operated to successfully'pick up a single sheet only from'the top of thepile and remove it therefrom is greater than the speed which can be normally acquired by an operator who has to perform this operation by grasping the top sheet with her fingers in order to lift it from the pile and remove it. v

In order to give anunderstanding of my invention, I have illustrated an embodiment thereof in, the accompanying drawings which will now be described, after which the novel features will be pointed out in the appended claims.

In the drawings,

Fig. 1 is a, side view'of a device embodying my invention which is designed for hand manipulation. V

Fig. 2 is an end view thereof looking from the left, Fig. 1.

Fig. 3 is a section on the line 3-3, Fig. 1.

Fig. 4' is a view illustrating the manner in which the device is used.

Thedevice herein shown comprises a head member. 3 which is constructed to have mounted thereon a roll 4 of pressure sensitive adhesive tape- I, said roll being arranged as usualwith the non-adhesive face of, the tape on the outside and for convenience being referred to as the delivery roll.

Associated with the head 3 is a foot member 3 5 which is also constructed to support another roll 6 of pressure sensitive: adhesive tape onto which the tape 1 is rewound as it is taken off from the roll 4. Such rewinding is done in such a way that the tape on the roll 6 will have its adhesive face on the outside.

The head 3 is provided with an extension 8 having ways 9 in which the foot 5 is received, said foot being capable of moving in said ways toward and from the head 3. The foot 5 is acted on by a spring Ill whichis located between said foot and head 3 and which normal? 1y tends to move the foot away from the head,

the extension 8 being provided with stop I shoulders H which limit the spring impelled movement of the head 5. The rewind roll 6 is herein shown as mounted on a shaft [2 which extends through the foot 5 and is so positioned that the lower portion of said roll 6 projects beyond the bottom of the foot and is thus exposed for engagementwith the top sheet of a pile of sheets. When the exposed adhesive face l3 of the pressure sensitive adhesive tape on the roll 6 is brought into pressure contact with the top sheet, its adhesion thereto will lift the top sheet from the pile when the device is raised.

As stated above this pickup device may be either operated automatically or manually, and as herein shown the head 3 is providedwith a handle [4 by which the device can be manuall manipulated as illustrated in Fig. 4.

Said Fig. 4 illustrates a bed 15, which may be the. bed or platen of a marking machine, on which is a pile l6 of pieces of cloth which are to be marked, the top piece being indicated at H.

- In using the device the operator will bring the exposed adhesive face l3 of the pressure sensitive adhesive tape into pressure contact with the. top sheet ll of the pile l6 as soon as said sheet has received its imprint from the marking machine, and while the printing head is being raised and then lowered again for another printing operation, the operator will, by a quick and adept movement, move the pickup device with its attached top sheet .l'l' backwardly thereby removing said sheet from the pile.

The removed sheet may be easily stripped from the pickup device by a quick jerking movement thereof or by applying a pulling force to the sheet or piece to disengage it from the pressure sensitive adhesive tape.

Inasmuch as the operator does not have to perform the operation of pinching or grasping the top sheet for thus removing it, she is able to make the necessary downward and backward movement of the pickup device for removing the top sheet at an increased speed.

Since the pickup device herein shown has adhesive contact with the top sheet only, said top sheet will be the only one which will be removed from the pile and thereby all danger of accidentally removing a second sheet with the top printed sheet is avoided.

In order that the device may operate satisfactorily and accurately for long periods of time, means are provided whereby at eachv operation of the device the rewind roll 6 will be turned forward slightly to Withdraw a small increment of tape from the delivery roll 4, and in this way a fresh portion of the adhesiveface of the tape will be presented at the bottom of the roll 6' at each operation of the device.

For this purpose the shaft I2 on which the rewind roll 6 is mounted has fastened thereon 4 a ratchet wheel 18 and the head 3 has pivotally mounted thereon at I9 a feed pawl 20 which cooperates with the ratchet l8, said pawl being acted on by a suitable spring 2| which holds it yieldingly in engagement with said ratchet.

Each time that the device is moved downwardly against the top sheet I! ofthe pile, the pressure contact of the device against the sheet will move the foot 5 backwardly slightly against the action of the spring l0, and during this backward movement the engagement of the pawl 20 with a tooth of the ratchet l8 will give the shaft [2 and the rewind roll 6 thereon a slight forward turning movement. For practical purposes it is suificient if this forward feeding movement is such as to feed the tape 1 forward about ,4 of an inch at each operation, although the amount of feed may be varied by varying the number of teeth on the ratchet without in any way departing from the invention.

While I have illustrated one embodiment of the invention yet I desire to state that said invention is not limited to the particular structure illustrated as the important feature thereof is a pickup device which embodies pressure sensitive adhesive tape for lifting and removing the top sheet from a pile of sheets.

While the invention is especially applicable for use in removing pieces or sheets of cloth from a pile or stack, yet it is equally applicable for removing pieces or sheets of other material.

I claim:

1. A pickup device for removing individual sheets from a stack of sheets comprising a head, a delivery roll of pressure sensitive adhesive tape mounted thereon, a foot membersupported by the head, a shaft carried by said foot member, a rewind roll mounted on the shaft on which said tape is rewound from the delivery roll with the adhesive face of the tape on the outside thereof, means mounting said foot member for movement toward and from the head, a spring resisting the movement of the foot member toward the head whereby when the exposed face of the pressure sensitive adhesive tape'is pressed against said sheet to be lifted the head is retracted slightly, a ratchet on said shaft and a pawl carried by the head andengaging said ratchet and operative toturn the ratchet and the shaft an increment at each operative movement of the foot member.

2. A pickup device for removing individual sheets from a stack of sheets comprising a head, a delivery roll of pressure sensitive adhesive tape mounted thereon, a foot member beneath said head, a shaft carried by said foot member, a rewind roll mounted on said shaft on which said tape is rewound from the delivery roll with theadhesive face of the tape on the outside thereof, said shaft being positioned to support said rewind roll with a portion thereof exposed below the foot member, means yieldingly'sup porting said foot member on the head for movement toward and from the latter in a direction at right angles to the axis of the shaft, and means operated by the backward yielding movement of the foot member when the exposed portion of the rewind roll is pressed against the top sheet of the stack of sheets to advance said rewind roll slightly and thus wind thereon an increment of tape from the delivery'roll.

' 3. A pickup device for removing individual sheets from a stack of sheets comprising a head,

' a delivery roll of pressure sensitive adhesive tape mounted thereon, a foot member supported by the head beneath the latter, a shaft carried by the foot member, a rewind roll mounted on said shaft on which tape delivered from the delivery roll is rewound with the adhesive side of the tape exposed on the outside thereof, said shaft supporting the rewind roll with a peripheral portion thereof projecting below said foot member and in position to be brought into engagement with the sheet to be picked up, said foot member being movable toward and from the head in a directon at right angles to the axis of the rewind roll, a spring acting on said foot member and resisting movement thereof toward the head and holding the rewind roll yieldingly in operative position, whereby when the head is manipulated to bring the rewind roll into pressure contact with the top sheet of the stack of sheets, a foot member will yield upwardly against the action of the spring, and means operated by such yielding movement to give the rewind roll a slight turning movement, thereby to wind an increment of the adhesive tape thereon.

4. A pickup device for removing individual sheets from a stack of sheets comprising a head, a delivery roll of pressure sensitive adhesive tape mounted thereon, a foot member beneath said head, a shaft carried by said foot member, a

rewind r011 mounted on said shaft on which said tape is rewound from the delivery roll with the adhesive face of the tape on the outside thereof, said shaft being positioned to support said rewind roll with a portion thereof exposed below the foot member, means yieldingly supporting said foot member on the head for movement toward and from the latter in a direction at right angles to the axis of the shaft, and means operated by the backward yielding movement of the foot member when the exposed portion of the rewind roll is pressed against the top sheet of the stack of sheets to advance said rewind roll slightly and thus wind thereon an increment of tape from the delivery roll, and a handle connected to the head by which the device may be manipulated.

OTTO B. MEYERS.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 602,948 Kunkle Apr. 26, 1898 1,648,115 Dickman et a1 Nov. 8, 1927 2,351,367 Rider June 13, 1944 2,423,962 Clark et a1. July 15, 1947