US2509073A - Article-working apparatus - Google Patents

Description

May 23, 1950 B. A. RAETscH ARTICLE-WORKING APPARATUS Filed May 4, 1946 lNvsNToR B. ARAETscH Patented May 23, 1950 UNITED STATES PATENT OFFICE ARTICLE -WORKING APPARATUS Application May 4, 1946, Serial No. 667,345

Claims. (Cl. 242-9) This invention relates to article-working apparatus, and more particularly to means for starting windings of resistance Wires around supporting cards at lparticular points on the cards.

In the manufacture of potentiometer cards of a type including a supporting card having a predetermined prole and an extremely ne resistance wire wound closely around the supporting card, it is desirable to begin the Winding of the fine resistance wire around the potentiometer card at a predetermined point thereon with respect to the profile thereof. In the past, due to the extreme neness of the wire and the close winding thereof, it has been diicult to start the winding at a predetermined point with respect to the proiile of the supporting card.

An object of the invention is to provide new and improved article-working apparatus.

Another object of the invention is to provide new and improved apparatus for Winding a iine insulating wire around a supporting card in a predetermined position with respect to the card.

In accordance with one embodiment of the invention, a supporting card having a proiile and holes near the ends thereof in predetermined positions with respect to the profile is held securely by clamps and xed pins, which pins enter the holes in the supporting card in close fitting relationship therewith. A serving head is mounted on a carriage which is mounted slidably on a lathe bed, and a feed screw serves to move the serving head along the supporting card to wind a resistance wire thereon with a uniform lay. A dial indicator is mounted adjacent to the starting point of the serving head in a iiXed position with respect to the supportingV card. A

spring-loaded plunger is mounted on the carriage in a position in which it actuates the dial indicator when the serving head and the carriage are moved to a position near that at which the winding of a resistance wire is to be begun. When the serving head is in a position in which a winding of a resistance wire upon the supporting card is to be started, the dial indicator will have a Fig. 2 is a fragmentary, front elevation of the apparatus;

Fig. 3 is an enlarged, vertical section taken along line 3-3 of Fig. 2, and

Fig. 4 is an enlarged, top plan view ofv a portion of the apparatus.

Referring now in detail to the drawings, an apparatus for winding a resistance wire I0 (Fig. 1) having a very small diameter around a supporting card II to form a potentiometer card I2 is shown therein. This winding apparatus per se is disclosed and claimed in Patent No. 2,382,451, issued October 14, 1945, and includes a serving head I5, which is mounted in a predetermined position on a carriage I6, which may be moved along a lathe bed I'I by a feed screw I8. The winding apparatus also includes clamps I9 and 2Il having fixed pins 2| and 22, respectively, which fit tightly within bores formed in the supporting card II, of which a bore 23 is shown, to hold the card in a position in which a corner 25 and a lobe 26 of the card are positioned predetermined distances from the pin 2|.

A high-sensitivity dial indicator 3D (Fig. 4) of a well-known type and having a spring-loaded plunger 3l, apointer 32 and a dial 33 calibrated in thousandths of an inch is mounted on a support 35 in a predetermined position with respect to the pin 2l, in which positionthe tip of the spring-loaded plunger 3| normally is a predetermined distance to the left of the pin 2I, as viewed in Fig. 2, and the plunger 3| extends parallel with the lathe bed. Y

A bracket 45 having arms 4I-4I having bores 42-42 (Fig. 3) formed therein serves to mount an externally threaded guide 45 in the bores 42-42. A knurled nut 46 fitting closelybut rotatably between the arms 4 I-4I of the bracket 40 is threaded upon the guide 45. Knurlednuts 46 and 41 threaded on the guide 45 hold the guide in a fixed position with respect to the bracket 40. The nuts 46 and 41 may be threaded farther onto or farther off of the guide 45 to adjust the position of the guide with respect tothe bracket 46' and hence with respect to the serving head I5. The guide 45 has a bore 50 formed therein and also is provided With a counterbore 5I. A carriage plunger 52 is mounted slidably within the bores 50 and 5I and has a shoulder 55 formed thereon. A compression spring 56 positioned in the counterbore 5I in the guide 45 urges the plunger 52 to the left, as viewed in Fig. 3, and the movement of the plunger 55 to the left is limited by a collar 51 fastened to the right end of the plunger.

The bracket 40 is provided with holes GII-60,

in which a gauge rod 6I is slidably mounted. A pointer 62 inscribed on the bracket indicates on a scale 63 formed on the gauge rod 6I the normal position of the gauge rod with respect to the serving head I5. An adjustable stop 65 mounted adjustably on an arm 66 formed on the guide 45 is designed to engageY the endt oi. the gauge rod 6I to position the guide 45 with respect to the gauge rod and the bracket 4U. The stop 65 is pinned to prevent adjustment thereof after it has been adjusted correctly initially..v When thestop 65 is in engagement with the gauge rod,

the position of the guide 45 withV respect tothe'Y serving head I5 may be determined from thev reading of the pointer 62 on the scale 63 of the gauge rod. A locking pin B'I sslid'ably mounted in a bore formed in the bracket 40, and is designed to enter one of a plurality of bores 'II--TI formed in the gauge rod 6I to secure the gauge rod in one ci' several possible positionsthereof with respect to the bracket 40 and the serving head I5.

The position of the pointer 62 with respect to the serving head I5 isl known, and the normal position of the tip of the plunger 3F of the inditions for different types of cards, and the nuts 46 and 4l are actuated to move theA guide to a position inwhich the stop 65 engages the gauge rod 6I. The distance1 from any mark on the gauge rod 6I tothe right endf thereof also is known. Hence, for any particular setting of the gauge rod and guide ll,Y in which setting the stop 65 engages the gauge rod, the distance parallel to the lathe bed I'I from the left end: of the gauge rod to the serving head is known, and this distance remains fixed until a;` further adjustment oi' the gauge rod and the guide 45- are made. Since the normali distance from the pin 2I to the tip of the plungerv 3I and the distance from the left end of' thegcarriage plunger 512` toL the serving head I5 are known, the distance from the serving head tothe pin 2| is'knovvn when the plunger 5 2 iust touches the plunger 3I. Hence, any further movement ofthe serving head I5 to the left is indicated by the dial; indicator 30.

In the operation of the apparatus described hereinabove, the supporting card II (Figs` l and 2) is thrust partially through the serving head I5, is placed over the pins 2| and 22' and is clamped by the clamps I9` and 28 in a position in which the pins 2l and 22 project through the bores illustrated byv the bore 23, in close-tting engagement therewith so that the supporting card is heldl in a predetermined position with respect to the dialV indicator TheV serving head I5 then is moved to the left, as viewed in Fig. 1, bythe. feed screw i8' and the carriage I6. As the carriage approaches the position at which the winding of the resistance Wire i0 around the supporting card is to be started, the carriage plunger 52v engages the spring-loaded plunger 3I and urges it to the left. The springv 56 is much stronger than the spring urging the plunger 3I to. the right and' is normally under a, high enough compression that the carriage plunger 52" is not moved against the action` oi the spring 5B until the spring urging the plunger 3|. to the right is completely compressed'. 0n further movement, the spring 56 will be compressed to prevent damage to theindicator.

The movement of the spring-loaded plunger 3l to the left moves the pointer 32 from the zero point on the dial 33 in proportion to the linear distance the plunger 3I is moved by carriage plunger 52, and when the pointer 32 is in a predetermined position with respect to the dial 33, the serving head I5 is in the correct position with respect to the corner 25 and the lobe 26 of the supporting card Il, the corner 25 and the lobe 26 to begin Winding the iine resistance wire I0 upon the supporting card. The indicator also indicates when. the serving head I5 is winding particular turns of the resistance wire positioned near the initial turn thereof on the card so that thev machine may be stopped and these turns marked for future operations thereon.

rIhe dial indicator 3D is highly sensitive so that the position of the serving head I5 with respect to the supporting card II may be determined Within very close limits. Hence, the Winding of the resistance wire I around' thesupporting card Ii may be started at a very accurately located position with respect to the corner' 25 and.' the lobe 26 of the supporting card so that. potentiometer cards, illustrated by the potentiometer card I2, may be made uniformly. The' carriage plunger 52 is resiliently rather than rigidly mounted on the carriage I6 so that damage to the indicatorv from too great movement to the left' of the carriage is prevented, but the spring 5t' islstrong enough and iscompressed enough initially that the indicator will' be` actuated to read its full range before the spring 56 will be further compressed.

What is claimed` is:

1. An apparatusv for Winding potentiometer cards, which comprises. a lathe bed, means for clamping an insulating card atA the ends thereof in a predetermined position extending along the lathe bed, a serving head for winding a wire around an insulating card held' by the card-holding means, a carriage mounted onl the lathe bed forsupporting the serving head1, a feed screw for reciprocating the carriage along the lathe bed to reciprocate theserving head' along the insulating card, a spring-loaded plunger carried by the carriage, and? a dial' indicator mounted in a predetermined position with respect to the insulating card and engageable byv the springloaded plunger for indicating the position of the serving head with respect. to-Y the insulating card.

2; An apparatus for winding potentiometer cards, which comprises a guideway, means for clamping an insulating card' at the ends thereof in a predetermined position extending along the guideway, a, serving head for winding a wire aroundi an insulating card heldr by the cardhol'ding means, a carriage slidably mounted on theguideway for supporting the serving head, a feed' screwl for advancing the carriage along the guidewayV to advance the serving head along the insulating card, aspring-loaded plunger carried by the carriage, and a dial indicator at one end of the guideway in a predetermined position' with respect to the insulating card and engageable by the spring-loadedv plunger for indieating the position ofthe` serving head with respect to the insulating card when the carriage is moved to a position near that end of the guideway.

3. In a winding apparatus including a lathe bed, means for holding an insulating card in a position extending alongA the lathe bed and in a predetermined relative longitudinal position with respect to the lathe bed, a serving head, a carriage for mounting the serving head and a feed screw for moving the carriage along the lathe bed to move the serving head along an insulating card held by the card-holding means, means for indicating the starting position of the serving head with respect to the insulating card comprising a spring-loaded plunger mounted on the carriage and movable therewith along a predetermined path, and a dial indicator including a movable plunger positioned in said path in alignment with the rst-mentioned plunger and engageable thereby for indicating the position oi the serving head with respect to the insulating card when the first-mentioned plunger engages the movable plunger of the indicator.

4. In a Winding apparatus including a guideway, means for holding an insulating card in a predetermined position with respect to and parallel with the guideway, a serving head for winding a ne resistance Wire around an insu= lating card held by the card-holding means, a carriage mounted for movement along the guide- Way for holding the serving head and a feed screw for advancing the carriage along the guideway to move the serving head along the insulating card, a device for indicating the position oi the serving head with respect to the insulating card comprising a gauge including a pointer, a dial, and a movable plunger for moving the pointer along the dial, said gauge being mounted in a predetermined position With respect to the insulating card, a bracket mounted on the carriage, a guide supported adjustably on the bracket, a spring-loaded plunger carried by the guide, and means for indicating the normal position of the last-mentioned plunger with respect to the bracket, said last-mentioned plunger being mounted in a position in which it engages the rst-mentioned plunger near an end of the path of travel of the carriage so that the pointer indicates on the dial the position of the serving head with respect to the insulating card when the carriage is near that end of its path of travel.

5. An apparatus for Winding potentiometer cards, which comprises a guideway, means for clamping an insulating card in a predetermined position extending along the guideway, a serving head for winding a Wire around an insulating card held by the card holding means, a carriage slidably mounted on the guideway for supporting the serving head, means for advancing the carriage along the guideway to advance the serving head along the insulating card, an actuator carried by the carriage, and a dial indicator at one end of the guideway in a predetermined position with respect to the insulating card and engageable by the actuator for indicating the position of the serving head with respect to the insulating card when the carriage is moved to a position near that end of the guideway.

BRUNO A. RAETSCH.

REFERENCES CITED rlhe following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 2,078,352 Summers Apr. 27, 1937 2,239,261 Turrettini Apr. 22, 1941 2,382,451 Stastney Aug. 14, 1945 2,389,859 Lambert Nov. 27, 1945 2,406,793 Benkoe Sept. 3, 1946 FOREIGN PATENTS Number Country Date 119,153 Germany Mar. 11, 1900

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