US2674894A - Drive and full-stroke mechanism - Google Patents

Description

- C W. ADSHEAD DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 I Kpnl 13, 1954 5 Sheets-Sheet l I INVENTOR CHARLES WADSHEAD .BYZ Q z' mom:

. m pa T 1.

A ril 13, 1954 c. w. ADSHEAD 2,674,894

DRIVE AND FULL-STROKE MECHANISM Filed Jan. 50, 1950 5 Sheets-Sheet 2' CHARLES w ADSHEAD ZVMJMLM ATTMIIEYS DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 5 Sheets-Sheet 5 J IHVENTOR CHARLES W ADSHEAD .(TTMNEYS INVENTOR 7 MW ATTDRNEYS April 1954 c. w. ADSHEAD DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 5 Sheets-Sheet 4 CHARLES W ADSHEAD April 13, 1954 c. w ADSHEAD 2,674,894

DRIVE AND FULL-STROKE MECHANISM Filed Jan. 30, 1950 5 Sheets-Sheet 5 INVENTOR CHARLES W ADSHEAD B) ATTORNEYS Patented Apr. 13, 1954 ca:

; UNITED) STATES PATENT OFFICE I v DRIVE ANDFULL-STROKE, MECHANISM Charles William Adshead London, England, as-

signor to Setright Registers Limited, London. England, a British company ApplicationJanuary 30, 1950, Serial No. 141,224

Claims priority, application Great Britain February 3, 1949 1 Claim. (01. 74-'142) and ratchet wheel preventing reverse movement,

of the handle and means for automatically disengaging the non-return pawl from the ratchet wheel when the handle reaches the end of its operating stroke and to hold the pawl disengaged during the return stroke of the handle whereby it is necessary to effect a complete operating stroke of the handle before it can be returned to its starting position. In one arrangement of the machine the driving ratchet wheel or a wheel movable therewith, is rotated by the handle during its operative stroke and remains stationary during the return stroke and has teeth at spacings corresponding to a complete operating stroke of the handle, engaged by a detent when the handle is at the end of its stroke and the detent is arranged when engaged in a tooth to release the pawl on the non-return ratchet wheel.

A specific embodiment of a machine accordingto the invention for printing and preparing for use adhesive wrapping tapes will now be described by way of example, and with reference to the accompanying drawings in which:

Figure 1 is a perspective view of the machine,

Figure 2 is a view in the direction IIII in Figure 3 showing the platen and associated mechanism,

Figure 3 is a view in the direction IIIIII in Figure 2,

Figure 4 is a view in the direction IV--IV in Figure 2,

Figure 5 is an enlarged sectional view of part of the platen operating mechanism shown in Figure 2,

Figure 6 is a detail view in the direction IX-D in Figure 5 (part of ratchet wheel 94 being shown cut-away to expose part of ratchet wheel 92), and

Figure 7 is a detail View in the direction X-X in Figure 5.

The machine according to this example is mounted on a rectangular base plate I and is intended to be secured to the edge of a packing table (seeparticula-rly Figure 1). r

The machine comprises a vertically movable platen 52 which "has a downwardly extending stemfifi supported in a guide bearing 58 and a further bearing 00-; '"The' stem is provided with a collar 02 intermediate-its length, and a compression spring'fid' is mounted around the stem be-' tween the collar 02 and the guide bearing 50, such'thatthe spring-urges the collar 62 and 'so the platen 52 vertically upwards into its operating or printing positiom; A'cam 66b engages-the upper surface of the collar 62 so that, on rotation of the cam,-:the ,platen'ismoved alternately to-its Operating position by the spri and then from its operating position by the action of the cam.

The cam shaft 08 carries a gear which is free on the shaft and is engaged by a quadrant 02 pivoted to the casing at 84 and secured to an oscillatable operating handle 85 (Figures 2 and 3). The shaft 68 is supported in bearings in a sub-frame 8B, 81 (Figure 5) and the gear 80 has a boss which passes through the bearing in the frame member 80 and is secured to a disc 88 and a ratchet wheel 90 (Figure 5). The cam 66b which is fixed to the shaft 68 has a boss I 66 passing through the bearing on the frame member 81 and secured by pins I6! to two ratchet wheels 92, 94 each of which has two teeth. The teeth I94 of the wheel 94 have rear faces 294. Each ratchet tooth I94 extends circumferentially around wheel 04 from its rear face 204 to the rear face 204 of the other tooth I94, and each tooth I94 includes a sloping portion 304. The disc 80 carries a pawl 90 which engages the ratchet wheel 92 and the arrangement is such that when the handle 85 is operated by movement from the upright position to the lower position shown in Figure 3 the wheel 80 is rotated half a turn and, by engagement of the pawl 96 with the wheel 92, rotates the cam 06b half a turn. Independently pivoted on a short shaft I00 supported in the sub-frame there are two pawls I02, I04 spring-urged together against a stop I06 on the pawl I02 by a spring I08 (Figures 5 and 7). The pawl I02 engages the wheel 94 and is spring urged into such engagement by a spring H0. The purpose of the arrangement just described is to prevent return movement of the handle 85, after an operating stroke has been begun, until the stroke has been completed. At the beginning of an operating stroke the pawl I02 rides up the side I I2 of the notch in the wheel 90 and the two pawls I02, I04 are rocked, as a unit, anti-clockwise thereby to engage the pawl I04 in the teeth of the wheel 90 and to prevent backward movement of the wheel 90 and consequently of the handle. When the pawl I04 drops into the next notch in the wheel 94 the pawls I02, I 04 are swung clockwise as a unit and the pawl I04 is disengaged from the wheel 90 thereby freeing the handle for return movement.

The invention is not restricted to the details described in the above example. It may, for instance, be applied to the printing of additional information on pre-printed labels or slips. Further the tape reel and the supporting bearings therefor may be incorporated'iii'the casing for the printing mechanisms.

I claim:

In a machine for printing identification tabs, labels and tapes for securing wrappings, a drive and full-stroke mechanism comprising an oscillatory handle, a rotatable shaft, an operative connection between said handle and said shaft, said operative connection comprising a pawl-and-ratchet' device constituting a one-way clutch, whereby said shaft is driven to rotate on movement of the handle in one direction, a second pawl-and-ratchet device associated with said handle and constituting a one-way brake operative to prevent reverse rotation of said handle, means for automatically rendering said second pawl-and-ratchet device inoperative when said handle completes a forward stroke of predetermined length in the said one direction and for maintaining said second pawl-and-ratchet device inoperative during a return stroke of the handle in the opposite direction, which means comprise at least one ratchet tooth extending around the shaft and rotatable therewith, said ratchet tooth having a circumferential length corresponding to the amount of rotation of the shaft produced by a complete forward stroke of the handle, a detent pawl, resilient means urging said detent pawl to ride on the said ratchet tooth during the forward stroke of the handle and to engage behind the tooth when the handle reaches the end of its forward stroke, a connection between the detent pawl and the pawl of the said second pawl-and-ratchet device operative to disengage the said pawl of the said second pawl-and-ratchet device from the ratchet thereof on movement of the said detent pawl to engage behind the said ratchet tooth as aforesaid and to maintain said pawl of said second pawl-andratchet device disengaged from said ratchet thereof during said engagement of said detent pawl behind said ratchet tooth.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,106,995 Verner Aug. 11, 1914 1,393,232 Manshel Oct. 11, 1921 1,523,574 Baty Jan. 20, 1925 1,831,700 Blanchard et al. Nov. 10, 1931 1,890,598 Boyer Dec. 13, 1932 2,017,920 Rost Oct. 22, 1935 2,100,027 Faris Nov. 23, 1937 2,203,115 Wagner June 4, 1940 2,488,766 De Moss Nov. 22, 1949 2,586,040 Hoare Feb. 19,1952

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