US2489685A

US2489685A - Record disk cutting device

Info

Publication number: US2489685A
Application number: US769666A
Authority: US
Inventors: Arthur H Sultan
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-08-20
Filing date: 1947-08-20
Publication date: 1949-11-29
Anticipated expiration: 1966-11-29

Description

Nov. 29, 1949 A. H. SULTAN h RECORD DISK CUTTING DEVI CE 2 Sheets-Sheet 2 Filed Aug. 20, 1947 Patented Nov. 29, 1949 UNITED STATES PATENT OFFICE r RECORD DISK CUTTING DEVICE I Arthur H. Sultan, Baltimore, Md.

Application August 20, 1947, Serial No. 769,666

3 Claims.

This invention relates to improvements in record disc cutting devices, particularly of the character for cutting record grooves in phonograph record blanks.

Y The object of this invention is to improve the construction of devices for this purpose, to provide for the cutting of spaced grooves on a record blank by the action ofa phonograph recorder, using the groove of one record as a guide for the cutting head that forms a groove in another record blank. v

This object may be accomplished according to one embodiment of the invention by an attachment for the standard magnetic or crystal recording head, which attachment includes a guide that will follow the sound groove of one record disc to cause the recording head to cut a corresponding sound groove in another coacting record disc. This attachment has. a trolley member adjustably carried on an arm, to which'the guide needle may be secured; The attachment is capable of being secured to any standard recording head, having provision for adjustment according to the size thereof, while the trolley is adjustable also to the supporting arm, according to the size of record used.

This embodiment of the invention is illustrated in the accompanying drawings in which:

Fig. 1 is a perspective View of the record disc cutting device applied to a recording machine;

Fig. 2 is a longitudinal sectional view through the attachment with parts of the recording machine in elevation;

Fig. 3 is a cross section therethrough on the line 33 of Fig. 2 and Fig. 4 is a disassembled perspective view of the parts of the attachment.

The invention is shown as applied to a recording machine generally designated by the numeral l, which may be of standard construction and is shown as provided with the usual turntable 2, for supporting record discs, two of which are shown at 3 and 4, respectively, held in place on the turntable 2 by the usual pins 5.

A recording head is shown at 6, having a suitable support I therefor on top of the machine. The recording head 6 is provided with the usual recording stylus 8, adjustably secured in place by a screw 9. The foregoing structure is illustrated and described merely for purpose of illustration, and any suitable mechanism for the purpose may be used in connection with this invention, and to which the invention may be applied.

The attachment which is shown as an embodiment of this invention is adapted to be applied 2 to the recording head 6 to support an auxiliary stylus which is illustrated generally at Ill. The stylus I0 may be in the form of an ordinary phonograph needle where it is not used for cut ting a record groove, but instead follows a groove in the master record 3 as a guide for cutting a groove in the record 4. However, these parts may be reversed when it may be desired to cut a groove in the record 4. The stylus or needle I0 is secured in place by a set screw ll within an opening of a trolley l2.

The trolley I2 preferably is formed as a block of suitable material, such as plastic, which may be fashioned or molded for the purpose. The trolley I2 is adapted to fit against the under side of an arm [3, having an elongated slot 14 extending at an acute angle to the lengthwise axis of the arm as shown in Fig. 4. The upper face of the trolley I2 is undercut at l5, with a rib l6 therebetween that fits into the slot I4, as shown in Fig. 3, where the trolley is secured in place on the arm l3 by a bolt II. This bolt is shown of the type having a wing nut 18 thereon, to per: mit ready adjustment by hand for sliding the trolley lengthwise of the slot l4 to an adjusted position with respect to the arm l3, after which it may be secured in place by tightening the wing nut 8.

The arm l3 extends laterally from a clamp section l9 that extends partially around the recording head 6, and coacts with a clamp section 20 that extends around the opposite side of the head 6, for supporting the arm I3 and trolley I! on the head. These clamp sections I9 and 20 are adjustably connected together by means of a bolt 2| on the section l9, and a slot 22 in the section 20, in the form illustrated, whereby the sections may be adjusted toward and from each other to fit any size recording head as used expressly for recording sound on blank records.

The clamp l9-20 is secured to the recording head 6 by hooks 23 on the lower edges of the sections l9 and 20, as shown in Figs. 2 and 4, which hooks engage under the edges of the opposite sides of the head 6. A block of cushioning material 24, preferably in the form of sponge rubber, is shown as fitted within the clamp between the latter and the top of the recording head as an automatic take-up and for cushioning the connection of the clamp with the head.

In applying the attachment to the recording head, the clamp Ill-20 is lowered over the recording head 6 in the position shown in Fig. 2, and is secured beneath the head 'by the hooks 23. During this securing action, the sections are dis- 3 connected, but after the hooks are engaged, these sections are drawn together by the bolt 2| and tightened with the wing nut thereof. The sponge rubber pad 24 will take up unused space in the depth of the arm, according to the size of the latter.

With the nut I8 loosened, the trolley l2 may be moved along the slot I4 in the arm 13 until both the guide needle in the trolley and the recording needle on the head 6 rest about one-eighth of an inch from the outside edge of each of the records 3 and 4. Then the trolley is secured by the tightening of the bolt l1-l 8. Then the guide needle It] may be lowered until it rests by its own weight in the groove of the guide record, when the set screw H should be tightened to hold the needle in place.

Then upon operation of the turntable 2, the records 3 and 4 will be rotated. A sound groove will be cut in the record 4 identically likethe master groove previously formed in the record 3, which constitutes the master record for the pur- DOSE.

While the invention has been illustrated and described in one embodiment, it is recognized that variations and changes may be made there- In without departing from the invention, except as'specified in the claims.

I I- claim:

- 1. In a record disc cutting device adapted for use with a recording head operative over a recording turntable, an attachment for said recording head comprising an elongated arm, a stylus trolley 'adjustably mounted on the arm for adjustment lengthwise relative thereto, means for securing the trolley to the arm in adjusted position, and means connected with one end of the armfor clamping connection with the-recording head, said clamping means comprising a clamp section upstanding from the arm with an upper end portion offset therefrom to extend respectively beside the recording head and over the top thereof, an upturned hook at said end of the arm in position to engage the under edge of the recording head in opposed relation to the offset portion and coacting therewith to hold the clamp section on the recording head, and a second clamp section connected with said offset portion in-position to embrace the opposite side'of the recording head.

z :2. Ina record disc cutting device adapted for use with a recording head operative over a recording turntable, an attachment for said recording head comprising an elongated arm, a stylus trolley adjustably mounted on the arm for adjustment lengthwise relative thereto, means for securing the trolley to the arm in adjusted position, and means connected with one end of the arm for clamping connection with the recording head, said clamping means comprising a clamp section upstanding from the arm with an upper end portion offset therefrom to extend respectively beside the recording head and over the top thereof, an upturned hook at said end of the arm in position to engage the under edge of the recording head in opposed relation to the offset portion and coacting therewith to hold the clamp section on the recording head, a second clamp section having a hook portion in position to engage under the opposite edge of the recording head with an offset upper end portion in overlapping relation with the ofiset upper end portion of the first mentioned clamp section, and means for adjustably fastening said offset end portions together.

3. In a record disc cutting device adapted for use with a recording head operative over a recording turntable, an attachment for said record ing head comprising an elongated arm, a stylus trolley adjustably mounted on the arm for adjustment lengthwise relative thereto, means for securing the trolley to the arm in adjusted position, including an interfitting rib and slot connection between the trolley and the arm for sliding of the trolley along the arm, and means connected with one end of the arm for clamping connection with the recording head, said clamping means comprising a clamp section upstanding from the arm with an upper end por-' tion offset therefrom to extend respectively beside the recording'head and over the top thereof, an upturned hook at said end of the arm in position to engage the under edge of the recording head in opposed relation to the offset portion and coacting therewith to hold the clamp section on the recording head, and a second clamp section connected with said ofiset portion in posi-' tion to embrace the opposite side of the recording head.

ARTHUR H. SULTAN.

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