US2300616A - Listing machine - Google Patents

Description

1942- L. P. CROSMAN I LISTING MACHINE Filed Dec. 20, 1941 2 Sheets-Sheet 2 INVENTOR LOMYH E'Cflosrpan I Y I T-roRNEY Patented Nov. 3, 1942 LISTING MACHINE.

Loring Pickering Crosman, South Orange, N. J.,

assignor to Monroe Calculating Machine Company, Orange, N. J., a corporation of Delaware Application December 20, 1941, Serial No. 423,809

2 Claims. (01. 197-64) The invention relates to listing machines and more particularly to means for governing the tabulating movement of the platen carriage of such a machine.

The invention consists in the novel construction and combination of parts, as set forth in the appended claims.

In the accompanying drawings, illustrating the invention:

Fig. 1 is a fragmentary rear elevation of the carriage shifting means of a listing machine embodying the invention, parts being broken into section.

Fig. 2 is a detail section taken on line 22 of Fig. 1.

Fig. 3 is a detail section taken on line 3-3 of Fig. 1.

Fig. 4 is a detail sectional view showing a modilied form of the invention.

Fig. 5 is a detail right side elevation of the modified governing means.

The tabulating and carriage return mechanism to which the invention is shown as applied is disclosed in United States Patent No. 1,946,572, issued to Loring P. C'rosman on February 13, 1934, and entitled Listing calculator.

The platen carriage is tabulated by means of a spring 8 (Fig. 1) mounted in a drum whereon a tape 9 is wound, said tape being attached to the right side frame plate 3 of the carriage. The tabulated position of the carriage is controlled by a tabulator bar I, mounted in the carriage framing and having a series of spaced shoulders I93 designed to be brought into engagement with a detent 1 mounted in the main frame of the machine. Normally, detent 1 holds the carriage against the tension of spring 8, the detent being removed by the action of a trigger I84, the hook end of which is engaged over the end of the deaccordance with the character of the work to be done, that is to say, in accordance with the spacing of the columns in which printing is to be effected, and therefore this spacing may be quite irregular, and the extent to which the platen carriage is to be shifted by spring 8 may vary conmovement is great, excessive speed may be attained, and the engagement of tabulating bar I with detent I may be violent. It is the object of the present invention to govern the speed of the tabulating movement, and thereby to reduce the shock of bringing the carriage to rest;

It is intended that the carriage movement shall be governed by the speed of a part driven by an electric motor and, as shown, parts of the motor driven carriage return mechanism are employed for this purpose.

The carriage return drive is effected through shaft 41 (Fig. 1) connected with motor 48 by means of gearing 49, 50, EI, 52 and 53. Fast on shaft 41 is a gear 239, meshing with a gear 249, loosely mounted upon shaft 23 I. A friction clutch is designed to connect gear 2% with a spring drum assembly 526, also loosely mounted upon shaft 23I, a tape '24! being wound upon said drum and connected to the left hand frame plate 3 of the platen carriage. The clutch is engaged by rocking movement imparted to an annulus 221, having diametrically opposed inwardly extending teeth (not shown herein but illustrated in Patent No. 1,946,572). The teeth of annulus 221 engage the faces of two opposed disks 229 and rocking of annulus 22! will move the disks apart, this movement being transmitted to the gear 240 and through a friction disk 5I6 to the spring drum 526, the drum' being rotated and thereby, through tape 2M, moving the carriage toward the right.

Normally the spring drum 526 stands disen-' gaged from the motor drive, the spring of the drum being designed to take up slack in the tape 24!. A leaf spring 5|! bearing against the friction disk SIB and against a washer inserted in a groove of shaft 23I serves to hold the friction clutch normally disengaged.

The governor The motor driven element of the governor comprises a plate 5I8, fast upon a shaft EIS and provided with two pawls 529 normally held in inactive position by means of springs 52L Also fast on shaft 5I9 is a gear 522 meshing with the gear 239, fast upon shaft 41, whereby upon operation of motor 48 the pawls 529 will be driven in the direction indicated by the arrow in Fig. 3. .The motor will be started, whenever the platen carriage is tabulated, by the closing of a switch 65 in the motor circuit, this closure being effected by a stud 63 of insulation material, mounted upon a lever 20, which carries the detent I.

siderably. When the extent of the tabulating Upon release of detent I from tabulator bar I,

spring 22 will rock lever 28, counter-clockwise as seen in Fig. 1, thereby closing the switch 65.

The governor element which is driven in time with the movement of the carriage comprises a ratchet 523 (Fig. 3), mounted upon a sleeve supported upon shaft 5 l 9, this sleeve being also provided with a gear 524, meshing with a gear 525 which forms part of the return spring drum assembly 526. As the carriage is moved toward the left, under the influence of spring 8, drum 526 will be rotated by tape 24!, and ratchet 523 will be rotated in the direction of the arrow, Fig. 3. Simultaneous rotation of plate 5"! by the motor will impart a centrifugal action to the tails of pawls 520, thereby bringingthe contacting ends of the pawls into. engagement with ratchet 523. So long as the carriage movement drives ratchet 523 at less speed than that of plate 5l8, pawls 520 will ratchet over the teeth. of member 523, but should the speed of the carriage movement tend to become excessive, ratchet 523 will be held'by pawls 520 to the speed'of rotation of plate 518.

Since, when motor 48 is not running, pawls 52!) will be held by springs 52I out of contacting position with ratchet 523, drum 24! may be operated, when the machine is at rest, without interference by the governor. Such operation of the drum is disclosed in U. S. Patent No. 2,081,423, issued to Loring P. Crosman on May 25, 1937.

Alternative structure In machines in which independent action of drum 24! is not provided for, the governing mechanism may be somewhat simplified by providing governor pawls 527 (Fig. 5) which are spring urged at all times into engagement with the governor ratchet.

This form of the invention is illustrated in Figs. 4 and 5, reference numerals being applied thereto corresponding to those applied to Figs. 1 to 3, but distinguished by the exponent In this form of the invention the spring may be removed from the drum 526', and the friction disk 515' normally held lightly in contact with the drum assembly by means of a leaf spring 528, to remove slack from the tape 24! Operation of annulus 221' will effect heavy pressure of disk 5H5 against the drum assembly, as in the main form of the invention.

I claim:

1. In a listing machine having a platen carriage and tabulating means for said carriage including a carriage shifting spring; a member rotatable by the spring in time with the movement of said carriage, an electric motor, a second member rotatable by said motor, and a governing device mounted upon one of said rotary members and movable by centrifugal action into engagement with the other member to prevent movement of the spring driven member at a speed exceeding the speed of the motor driven member.

2. In a listing machine having a platen carriage and tabulating means for said carriage including a carriage shifting spring; a member rotatable by the spring in time with the movement of said carriage, an electric motor, a, second member rotatable by said motor, a ratchet mounted on the spring driven member, and a pawl mounted on the motor driven member and movable by centrifugal action into engagement with the ratchet to prevent movement of the spring driven member at a speed exceeding the speed of the motor driven member.

LORING PICKERING CROSMAN;

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