US1230229A - Hand-tacking device. - Google Patents

Description

A. R. SCHOENKY.

, HAND TACKING DEVICE.

APPLICATION FILED MAR. I6' i917.

Patented June 19, 1917.

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AUGUST R. SCI-IOENKY, OF SOMERVILLE, MASSACHUSETTS, ASSIGNOR TO REECE SHOE MACHINERY COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

HAND-'PACKING DEVICE.

Application filed March 16, 1917. Serial No. 155,187.l

This invention relates to hand-tacking devices such as are used in the manufacture of shoes. These hand-tacking devices are usually made with a casing or frame having a driver passage therein, a reciprocating driver operating in said passage, a tackreceiving chute leading to the passage, and a pick-off operated in timed relation with the driver to separate the last tack in the chute from the other tacks and deliver said tack to the driver passage when the driver is withdrawn, said tack being frictionally heldin the driver passage in position to be engaged by the driver at its next forward movement. In some hand-tacking devices the means for holding the tack in position to be engaged by the driver does not always successfully perform its function, and as a result, the tack which is positioned in the driver passage during the backward movement of the driver frequently-becomes accidentally discharged from the driver passage before the driver is actuated, so that when the driver is actuated there is no tack in position to be driven and imperfect work results.

One of the objects of my' present invention is to provide an improved' hand tacker of this type which has-means for preventing the discharge lof the tack in the driver passage by the driver until the pick-off device is about to be operated-to withdraw another tack from the chute andy deliver it to the driver passage 'and which is also so constructed that the second tack cannot be delivered t the driver passage while the first-named tack still remains therein, thus preventing the possibility of two tacks being driven at once.

Other objects of my invention are to improve hand tackers of this type, all asfwill be more'fully hereinafter set forth.

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

Figure 1 is a'sectional view of a portion of a hand tacker embodying my invention, said view showing the driver withdrawn and a tack positioned in the driver passage;

Fig. 2 is a fragmentary sectional view showing the driver in its tack-driving position;

Fig. 3 is a perspective view off device;

Figs. 4 and 5 are sectional views on the line 4 4, Fig. 2, showing the pick-off in different positions.

1 indicates the frame or casing which is provided with the throat portion 2 and the tip 3. The throat and tip are provided with the usual driver passage 4 in which the reciprocating driver 5 operates. This driver is secured to a plunger 6 operable in the casing 1 and which is acted upon by a spring 7 that normally holds it in its elevated position. The tacks to *be driven are received in an inclined chute or raceway 9 which leads into the driver passage 4, and the delivery of the tacks into the chute is controlled b v a pick-ofi" 10 which is nivotally mounted in the throat and is provided with the wedge-shaped nose 11.' The pick-off is shown as having the trunnions 12 which are journaled in the throat portion 2 and said throat portion is cut away at one side, as shown at 13, to receive the pick-ofi. The pick-0E is normally acted upon by a spring 14 which tends to move it into the position shown in Fig. 4. The pick-off is thrown into its open position by a cam member 15 which-is carried by the plunger 6 and moves with the driver.

The parts thus far described are such as are usually found inV hand-tacking devices of thisl nature and form no part of my present invention.

In hand tackers having the construction above described, the spring 7 normally holds of the pickthe plunger or driver actuator 6 in its retracted position with the driver withdrawn from the driver passage 4, a tack having previously been delivered to the driver passage. The pick-off at this time is in the position shown in Figs. 1 and 4 acting to hold the tacks 17 in the raceway 9. The tack in the driver passage is driven by depressing the plunger 6 with a quick movement, thus Patented June 19, 1917. I

forcing the driver 5 down through the driver passage 4L and driving the tack therein. During this downward movement, the pickoif actuating cam 15 is brought into engagement with the pick-off and the latter is swung backwardly into the position shown in Fig. 5. This allows the first or end tack in the raceway to fall into position against the driver, as shown in Figs. 2 and 5. As the plunger is again retracted and the cam 15 withdrawn from the pick-off, the latter will swing forwardly, thus carrying the pointed end 11 thereof between the end tack in the raceway -which is lying against the driver and the tack neXt thereto. So long as the driver remains in the driver passage, the pick-off cannot make its complete tack-separating movement because the presence of the end tack against the driver prevents the pick-off from swinging completely into the position shown in Fig. t. As soon, however, as the driver is withdrawn from the driver passage, the pick-olf can complete its movement into the position shown in Fig. 4 as the end tack which has been lseparated from the other tacks by the partial movement of the pick-off drops into the driver passage. Hand tackers of this type are usually provided with some means for engaging the tack which has been delivered to the driver passage for the purpose of retaining it therein until the driver makes its neXt tack-driving movement.

I have provided herein a novel means for retaining in the driver passage the tack which has been delivered thereto until said tack is acted upon by the driver, which means is constructed to prevent the tack from being delivered from the driver passage by the driver until the piclcoif is about to be operated by the cam 15, thus insuring that no second tack will be delivered to the driver passage unless the first tack has been ejected therefrom. The advantage of this is that it is impossible for more than one tack at a-time to be retained in the driver passage. v Y

My improvement is Valso 'constructed so that it'will notl be possible to dislodge the tack in the driver passage without having another tack delivered thereto if there be tacks in the raceway, so that at all times a tack will be held in the driver passage ready to be driven upon the descent of the driver.V

While various devices adapted to accomplish this end might be employed, I haveA illustrated herein a simple construction which comprises a tack-supporting ledge or shoulder 18 situated at such a point lin the driver passage that when the driver is moved downwardly into a position to engage a tack supported on said ledge, the cam 15 will be-in position to engage the pick-olf 10. This ledge 18 will preferably be in the form of anannular rib formed on the side wall of the driver passage and having such a dimension that the opening therethrough is slightly lessthan the diameter of the tack head so that when a tack is dropped into the driver passage, the head thereof will be retained on the ledge 18, as shown in Fig. l. The size of this annular ledge is, however, such that a slight pressure on the tack will force the head therethrough. rThe driver 5 and the cam 15 have such lengths relative to each other and the ledge 18 is so situated that when the driver is moved downwardly into'a position to engage the tack supported on the ledge, the cam 15 will be just ready to engage the pick-off 10. This is shown in Fig. 2. Hence whenever the driver is moved downwardly a Vsufficient distance to force the tack in the driver passage past the ledge 18, the pick-off 10 will be moved backwardly into the position shown in Fig. 5, thus allowingv the first or end tack in the chute to fall againstthe depressed driver, as shown in Fig. 2. When the driver is retracted again, then this first or end tack will be separated' from the chute` and deposited in the driver passage 4 and will drop into the position on the ledge 18 shown in Fig. 1. f

Since the cam 15 and driver 5 have such relative lengths that the cam engages the pick-olf only when the driver is brought into the position shown in Fig. 2, it will follow that if the driver is given-a partial downward movement which is insuflicient to bring it into engagement with the tack supported on the ledge 18, then the corresponding movement which is givenY to the cam 15 will be insuficient to cause it to engage and actuate the pick-off, and since no tack can bev delivered to the driver passage unless the pick-off is moved backwardly from the position shown in Fig. 1 into that shown in lli@ Fig. 5, it follows that so (long as a tack i remains in the driver passage on the ledge 18, it willbe impossible to deliver a secondI tack to the'driver passage. Moreover, the above construction insures that ifthe driver is at any time moved lsufficiently to force the tack in the driver passage past the ledge 18, then the pick-ofll will. be operated to cause another tack to be delivered to the driver passage when the driver is retracted. Hence with my invention there is no possibility that the driver passage will be left vacant at any time provided'there are tacks in. the l raceway. v

The ledge 18 is constructed so that it will positively prevent any tack from being discharged from the driver passage except-by theapplication of ka certain amount of pressure thereto, and there is, therefore, nopossibility that the tacks which are delivered to the driver passage will be'discharged therefrom except when the driver is actuated for this purpose. Y Y

While I have illustrated herein a selected embodiment of my invention, I do not Wish to be limited to the constructional features shown.

I claim:

1. In a hand tacker, the combination with a casing or frame having a driver passage, of a' reciprocating driver operating in sai pasasge, a plunger for operating the driver, a tack-receiving chute leading to said passage, an oscillatory pick-offl for delivering tacks singly to said passage from said chute, a cam carried by the plunger and operating vduring the driving movement thereof to move the pick-off backvvardly, a spring acting on the pick-off and giving the latter its forward tack-delivering movement as the plunger rises, and tack-retaining means located in the driver passage and situated to retain a tack delivered to the passage in such a position that when the driver is brought into engagement with the tack the cam Will be in a position to engage the pickoff.

2. In a hand tacker, the combination with a casing having a driver passage, of a reciprocating driver operating therein, a `plunger for actuating the driver, a tackreceiving chute leading to the driver passage, an oscillatory pick-0E for delivering tacks singly to said driver passage, a cam carried by the plunger for giving the pickoff its backward movement as the plunger descends, and a spring acting on the pick of to move the latter forwardly as the plunger rises, said driver passage having a non-yielding tack-retaining ledge therein situated to engage the head of a tack and hold the tack in such position that When the driver descends the cam Will engage the pick-off just after the driver has forced [the tack past the ledge.

the driver passage for retaining a tack therein until said tack is struck by the driver, said tack-retaining means being so situated that the cam Will actuate the pickofl' just after the driver has forced the tack past said tack-retaining means.

In testimony whereof I have signed my name to this specification.

AUGUST R. SCHOENKY.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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